merge mozilla-central to mozilla-inbound. r=merge a=merge

2024-11-24 13:21:05 +00:00 · 2017-08-10 17:41:11 +02:00 · 2017-08-10 17:41:11 +02:00 · 51d351f567
commit 51d351f567
parent 02da6c0726 4b79f3b23a
400 changed files with 10823 additions and 7148 deletions
--- a/.cron.yml
+++ b/.cron.yml
@ -38,11 +38,21 @@ jobs:
          - date
      when: [] # never (hook only)

-    - name: nightly-desktop-win
+    - name: nightly-desktop-win32
      job:
          type: decision-task
-          treeherder-symbol: Nd-Win
-          target-tasks-method: nightly_win
+          treeherder-symbol: Nd-win32
+          target-tasks-method: nightly_win32
+      run-on-projects:
+          - mozilla-central
+          - date
+      when: [] # never (hook only)
+
+    - name: nightly-desktop-win64
+      job:
+          type: decision-task
+          treeherder-symbol: Nd-win64
+          target-tasks-method: nightly_win64
      run-on-projects:
          - mozilla-central
          - date
--- a/accessible/interfaces/nsIAccessibilityService.idl
+++ b/accessible/interfaces/nsIAccessibilityService.idl
@ -98,11 +98,3 @@ interface nsIAccessibilityService : nsISupports
   */
  boolean isLogged(in AString aModule);
 };
-
-/**
- * @deprecated, use nsIAccessibilityService instead.
- */
-[scriptable, builtinclass, uuid(d85e0cbe-47ce-490c-8488-f821dd2be0c2)]
-interface nsIAccessibleRetrieval : nsIAccessibilityService
-{
-};
--- a/accessible/xpcom/xpcAccessibilityService.cpp
+++ b/accessible/xpcom/xpcAccessibilityService.cpp
@ -91,8 +91,7 @@ xpcAccessibilityService::Release(void)
  return count;
 }

-NS_IMPL_QUERY_INTERFACE(xpcAccessibilityService, nsIAccessibilityService,
-                                                 nsIAccessibleRetrieval)
+NS_IMPL_QUERY_INTERFACE(xpcAccessibilityService, nsIAccessibilityService)

 NS_IMETHODIMP
 xpcAccessibilityService::GetApplicationAccessible(nsIAccessible** aAccessibleApplication)
--- a/accessible/xpcom/xpcAccessibilityService.h
+++ b/accessible/xpcom/xpcAccessibilityService.h
@ -7,13 +7,12 @@

 #include "nsIAccessibilityService.h"

-class xpcAccessibilityService : public nsIAccessibleRetrieval
+class xpcAccessibilityService : public nsIAccessibilityService
 {

 public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIACCESSIBILITYSERVICE
-  NS_DECL_NSIACCESSIBLERETRIEVAL

  /**
   * Return true if xpc accessibility service is in use.
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@ -1096,7 +1096,11 @@ pref("security.sandbox.content.level", 3);
 //
 // This setting may not be required anymore once we decide to permanently
 // enable the content sandbox.
+#ifdef NIGHTLY_BUILD
 pref("security.sandbox.content.level", 3);
+#else
+pref("security.sandbox.content.level", 2);
+#endif
 pref("security.sandbox.content.write_path_whitelist", "");
 pref("security.sandbox.content.read_path_whitelist", "");
 pref("security.sandbox.content.syscall_whitelist", "");
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@ -22,54 +22,53 @@ XPCOMUtils.defineLazyGetter(this, "extensionNameFromURI", () => {
 // lazy module getters

 XPCOMUtils.defineLazyModuleGetters(this, {
-  AboutHome: "resource:///modules/AboutHome.jsm",
-  BrowserUITelemetry: "resource:///modules/BrowserUITelemetry.jsm",
-  BrowserUsageTelemetry: "resource:///modules/BrowserUsageTelemetry.jsm",
-  BrowserUtils: "resource://gre/modules/BrowserUtils.jsm",
-  CastingApps: "resource:///modules/CastingApps.jsm",
-  CharsetMenu: "resource://gre/modules/CharsetMenu.jsm",
-  Color: "resource://gre/modules/Color.jsm",
-  ContentSearch: "resource:///modules/ContentSearch.jsm",
-  ContextualIdentityService: "resource://gre/modules/ContextualIdentityService.jsm",
-  CustomizableUI: "resource:///modules/CustomizableUI.jsm",
-  Deprecated: "resource://gre/modules/Deprecated.jsm",
-  DownloadsCommon: "resource:///modules/DownloadsCommon.jsm",
-  E10SUtils: "resource:///modules/E10SUtils.jsm",
-  ExtensionsUI: "resource:///modules/ExtensionsUI.jsm",
-  FormValidationHandler: "resource:///modules/FormValidationHandler.jsm",
-  GMPInstallManager: "resource://gre/modules/GMPInstallManager.jsm",
-  LightweightThemeManager: "resource://gre/modules/LightweightThemeManager.jsm",
-  Log: "resource://gre/modules/Log.jsm",
-  LoginManagerParent: "resource://gre/modules/LoginManagerParent.jsm",
-  NewTabUtils: "resource://gre/modules/NewTabUtils.jsm",
-  PageActions: "resource:///modules/PageActions.jsm",
-  PageThumbs: "resource://gre/modules/PageThumbs.jsm",
-  PluralForm: "resource://gre/modules/PluralForm.jsm",
-  PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.jsm",
-  ProcessHangMonitor: "resource:///modules/ProcessHangMonitor.jsm",
-  PromiseUtils: "resource://gre/modules/PromiseUtils.jsm",
-  ReaderMode: "resource://gre/modules/ReaderMode.jsm",
-  ReaderParent: "resource:///modules/ReaderParent.jsm",
-  RecentWindow: "resource:///modules/RecentWindow.jsm",
-  SafeBrowsing: "resource://gre/modules/SafeBrowsing.jsm",
-  SessionStore: "resource:///modules/sessionstore/SessionStore.jsm",
-  ShortcutUtils: "resource://gre/modules/ShortcutUtils.jsm",
-  SimpleServiceDiscovery: "resource://gre/modules/SimpleServiceDiscovery.jsm",
-  SitePermissions: "resource:///modules/SitePermissions.jsm",
-  Social: "resource:///modules/Social.jsm",
-  TabCrashHandler: "resource:///modules/ContentCrashHandlers.jsm",
-  TelemetryStopwatch: "resource://gre/modules/TelemetryStopwatch.jsm",
-  Translation: "resource:///modules/translation/Translation.jsm",
-  UITour: "resource:///modules/UITour.jsm",
-  UpdateUtils: "resource://gre/modules/UpdateUtils.jsm",
-  Utils: "resource://gre/modules/sessionstore/Utils.jsm",
-  Weave: "resource://services-sync/main.js",
-  WebNavigationFrames: "resource://gre/modules/WebNavigationFrames.jsm",
-  fxAccounts: "resource://gre/modules/FxAccounts.jsm",
-  gDevTools: "resource://devtools/client/framework/gDevTools.jsm",
-  gDevToolsBrowser: "resource://devtools/client/framework/gDevTools.jsm",
-  webrtcUI: "resource:///modules/webrtcUI.jsm",
-  ZoomUI: "resource:///modules/ZoomUI.jsm",
+  ["AboutHome", "resource:///modules/AboutHome.jsm"],
+  ["BrowserUITelemetry", "resource:///modules/BrowserUITelemetry.jsm"],
+  ["BrowserUsageTelemetry", "resource:///modules/BrowserUsageTelemetry.jsm"],
+  ["BrowserUtils", "resource://gre/modules/BrowserUtils.jsm"],
+  ["CastingApps", "resource:///modules/CastingApps.jsm"],
+  ["CharsetMenu", "resource://gre/modules/CharsetMenu.jsm"],
+  ["Color", "resource://gre/modules/Color.jsm"],
+  ["ContentSearch", "resource:///modules/ContentSearch.jsm"],
+  ["ContextualIdentityService", "resource://gre/modules/ContextualIdentityService.jsm"],
+  ["CustomizableUI", "resource:///modules/CustomizableUI.jsm"],
+  ["Deprecated", "resource://gre/modules/Deprecated.jsm"],
+  ["DownloadsCommon", "resource:///modules/DownloadsCommon.jsm"],
+  ["E10SUtils", "resource:///modules/E10SUtils.jsm"],
+  ["ExtensionsUI", "resource:///modules/ExtensionsUI.jsm"],
+  ["FormValidationHandler", "resource:///modules/FormValidationHandler.jsm"],
+  ["LightweightThemeManager", "resource://gre/modules/LightweightThemeManager.jsm"],
+  ["Log", "resource://gre/modules/Log.jsm"],
+  ["LoginManagerParent", "resource://gre/modules/LoginManagerParent.jsm"],
+  ["NewTabUtils", "resource://gre/modules/NewTabUtils.jsm"],
+  ["PageActions", "resource:///modules/PageActions.jsm"],
+  ["PageThumbs", "resource://gre/modules/PageThumbs.jsm"],
+  ["PluralForm", "resource://gre/modules/PluralForm.jsm"],
+  ["PrivateBrowsingUtils", "resource://gre/modules/PrivateBrowsingUtils.jsm"],
+  ["ProcessHangMonitor", "resource:///modules/ProcessHangMonitor.jsm"],
+  ["PromiseUtils", "resource://gre/modules/PromiseUtils.jsm"],
+  ["ReaderMode", "resource://gre/modules/ReaderMode.jsm"],
+  ["ReaderParent", "resource:///modules/ReaderParent.jsm"],
+  ["RecentWindow", "resource:///modules/RecentWindow.jsm"],
+  ["SafeBrowsing", "resource://gre/modules/SafeBrowsing.jsm"],
+  ["SessionStore", "resource:///modules/sessionstore/SessionStore.jsm"],
+  ["ShortcutUtils", "resource://gre/modules/ShortcutUtils.jsm"],
+  ["SimpleServiceDiscovery", "resource://gre/modules/SimpleServiceDiscovery.jsm"],
+  ["SitePermissions", "resource:///modules/SitePermissions.jsm"],
+  ["Social", "resource:///modules/Social.jsm"],
+  ["TabCrashHandler", "resource:///modules/ContentCrashHandlers.jsm"],
+  ["TelemetryStopwatch", "resource://gre/modules/TelemetryStopwatch.jsm"],
+  ["Translation", "resource:///modules/translation/Translation.jsm"],
+  ["UITour", "resource:///modules/UITour.jsm"],
+  ["UpdateUtils", "resource://gre/modules/UpdateUtils.jsm"],
+  ["Utils", "resource://gre/modules/sessionstore/Utils.jsm"],
+  ["Weave", "resource://services-sync/main.js"],
+  ["WebNavigationFrames", "resource://gre/modules/WebNavigationFrames.jsm"],
+  ["fxAccounts", "resource://gre/modules/FxAccounts.jsm"],
+  ["gDevTools", "resource://devtools/client/framework/gDevTools.jsm"],
+  ["gDevToolsBrowser", "resource://devtools/client/framework/gDevTools.jsm"],
+  ["webrtcUI", "resource:///modules/webrtcUI.jsm"],
+  ["ZoomUI", "resource:///modules/ZoomUI.jsm"],
 });

 if (AppConstants.MOZ_CRASHREPORTER) {
@ -1609,34 +1608,7 @@ var gBrowserInit = {
    ctrlTab.readPref();
    gPrefService.addObserver(ctrlTab.prefName, ctrlTab);

-    // Initialize the download manager some time after the app starts so that
-    // auto-resume downloads begin (such as after crashing or quitting with
-    // active downloads) and speeds up the first-load of the download manager UI.
-    // If the user manually opens the download manager before the timeout, the
-    // downloads will start right away, and initializing again won't hurt.
-    setTimeout(function() {
-      try {
-        DownloadsCommon.initializeAllDataLinks();
-        Cu.import("resource:///modules/DownloadsTaskbar.jsm", {})
-          .DownloadsTaskbar.registerIndicator(window);
-      } catch (ex) {
-        Cu.reportError(ex);
-      }
-    }, 10000);
-
-    // Load the Login Manager data from disk off the main thread, some time
-    // after startup.  If the data is required before the timeout, for example
-    // because a restored page contains a password field, it will be loaded on
-    // the main thread, and this initialization request will be ignored.
-    setTimeout(function() {
-      try {
-        Services.logins;
-      } catch (ex) {
-        Cu.reportError(ex);
-      }
-    }, 3000);
-
-    // The object handling the downloads indicator is also initialized here in the
+    // The object handling the downloads indicator is initialized here in the
    // delayed startup function, but the actual indicator element is not loaded
    // unless there are downloads to be displayed.
    DownloadsButton.initializeIndicator();
@ -1660,27 +1632,12 @@ var gBrowserInit = {
      MenuTouchModeObserver.init();
    }

-    // initialize the sync UI
-    requestIdleCallback(() => {
-      gSync.init();
-    }, {timeout: 1000 * 5});
-
    if (AppConstants.MOZ_DATA_REPORTING)
      gDataNotificationInfoBar.init();

    if (!AppConstants.MOZILLA_OFFICIAL)
      DevelopmentHelpers.init();

-    requestIdleCallback(() => {
-      // setup simple gestures support
-      gGestureSupport.init(true);
-
-      // setup history swipe animation
-      gHistorySwipeAnimation.init();
-    });
-
-    requestIdleCallback(() => { gBrowserThumbnails.init(); });
-
    gExtensionsNotifications.init();

    let wasMinimized = window.windowState == window.STATE_MINIMIZED;
@ -1698,23 +1655,6 @@ var gBrowserInit = {
    gNavToolbox.addEventListener("customizationstarting", CustomizationHandler);
    gNavToolbox.addEventListener("customizationending", CustomizationHandler);

-    // End startup crash tracking after a delay to catch crashes while restoring
-    // tabs and to postpone saving the pref to disk.
-    try {
-      const startupCrashEndDelay = 30 * 1000;
-      setTimeout(Services.startup.trackStartupCrashEnd, startupCrashEndDelay);
-    } catch (ex) {
-      Cu.reportError("Could not end startup crash tracking: " + ex);
-    }
-
-    // Delay this a minute into the idle time because there's no rush.
-    requestIdleCallback(() => {
-      this.gmpInstallManager = new GMPInstallManager();
-      // We don't really care about the results, if someone is interested they
-      // can check the log.
-      this.gmpInstallManager.simpleCheckAndInstall().catch(() => {});
-    }, {timeout: 1000 * 60});
-
    SessionStore.promiseInitialized.then(() => {
      // Bail out if the window has been closed in the meantime.
      if (window.closed) {
@ -1727,21 +1667,6 @@ var gBrowserInit = {
      SidebarUI.startDelayedLoad();
      SocialUI.init();

-      // Telemetry for master-password - we do this after 5 seconds as it
-      // can cause IO if NSS/PSM has not already initialized.
-      setTimeout(() => {
-        if (window.closed) {
-          return;
-        }
-        let tokenDB = Cc["@mozilla.org/security/pk11tokendb;1"]
-                        .getService(Ci.nsIPK11TokenDB);
-        let token = tokenDB.getInternalKeyToken();
-        let mpEnabled = token.hasPassword;
-        if (mpEnabled) {
-          Services.telemetry.getHistogramById("MASTER_PASSWORD_ENABLED").add(mpEnabled);
-        }
-      }, 5000);
-
      PanicButtonNotifier.init();
    });

@ -1756,10 +1681,76 @@ var gBrowserInit = {
    this.delayedStartupFinished = true;

    _resolveDelayedStartup();
+
+    SessionStore.promiseAllWindowsRestored.then(() => {
+      this._schedulePerWindowIdleTasks();
+    });
+
    Services.obs.notifyObservers(window, "browser-delayed-startup-finished");
    TelemetryTimestamps.add("delayedStartupFinished");
  },

+  /**
+   * Use this function as an entry point to schedule tasks that
+   * need to run once per window after startup, and can be scheduled
+   * by using an idle callback.
+   *
+   * The functions scheduled here will fire from idle callbacks
+   * once every window has finished being restored by session
+   * restore, and after the equivalent only-once tasks
+   * have run (from _scheduleStartupIdleTasks in nsBrowserGlue.js).
+   */
+  _schedulePerWindowIdleTasks() {
+    // Bail out if the window has been closed in the meantime.
+    if (window.closed) {
+      return;
+    }
+
+    function scheduleIdleTask(func, options) {
+      requestIdleCallback(function idleTaskRunner() {
+        if (!window.closed) {
+          func();
+        }
+      }, options);
+    }
+
+    scheduleIdleTask(() => {
+      // Initialize the Sync UI
+      gSync.init();
+    });
+
+    scheduleIdleTask(() => {
+      CombinedStopReload.startAnimationPrefMonitoring();
+    });
+
+    scheduleIdleTask(() => {
+      // setup simple gestures support
+      gGestureSupport.init(true);
+
+      // setup history swipe animation
+      gHistorySwipeAnimation.init();
+    });
+
+    scheduleIdleTask(() => {
+      gBrowserThumbnails.init();
+    });
+
+    scheduleIdleTask(() => {
+      // Initialize the download manager some time after the app starts so that
+      // auto-resume downloads begin (such as after crashing or quitting with
+      // active downloads) and speeds up the first-load of the download manager UI.
+      // If the user manually opens the download manager before the timeout, the
+      // downloads will start right away, and initializing again won't hurt.
+      try {
+        DownloadsCommon.initializeAllDataLinks();
+        Cu.import("resource:///modules/DownloadsTaskbar.jsm", {})
+          .DownloadsTaskbar.registerIndicator(window);
+      } catch (ex) {
+        Cu.reportError(ex);
+      }
+    }, {timeout: 10000});
+  },
+
  // Returns the URI(s) to load at startup.
  _getUriToLoad() {
    // window.arguments[0]: URI to load (string), or an nsIArray of
@ -1875,10 +1866,6 @@ var gBrowserInit = {
        Cu.reportError(ex);
      }

-      if (this.gmpInstallManager) {
-        this.gmpInstallManager.uninit();
-      }
-
      if (AppConstants.isPlatformAndVersionAtLeast("win", "10")) {
        MenuTouchModeObserver.uninit();
      }
@ -4966,14 +4953,6 @@ var CombinedStopReload = {

    // Disable animations until the browser has fully loaded.
    this.animate = false;
-    let startupInfo = Cc["@mozilla.org/toolkit/app-startup;1"]
-                        .getService(Ci.nsIAppStartup)
-                        .getStartupInfo();
-    if (startupInfo.sessionRestored) {
-      this.startAnimationPrefMonitoring();
-    } else {
-      Services.obs.addObserver(this, "sessionstore-windows-restored");
-    }
  },

  uninit() {
@ -5010,24 +4989,19 @@ var CombinedStopReload = {
  },

  observe(subject, topic, data) {
-    if (topic == "sessionstore-windows-restored") {
-      Services.obs.removeObserver(this, "sessionstore-windows-restored");
-      this.startAnimationPrefMonitoring();
-    } else if (topic == "nsPref:changed") {
+    if (topic == "nsPref:changed") {
      this.animate = Services.prefs.getBoolPref("toolkit.cosmeticAnimations.enabled");
    }
  },

  startAnimationPrefMonitoring() {
-    requestIdleCallback(() => {
-      // CombinedStopReload may have been uninitialized before the idleCallback is executed.
-      if (!this._initialized)
-        return;
-      this.animate = Services.prefs.getBoolPref("toolkit.cosmeticAnimations.enabled") &&
-                     Services.prefs.getBoolPref("browser.stopReloadAnimation.enabled");
-      Services.prefs.addObserver("toolkit.cosmeticAnimations.enabled", this);
-      this.stopReloadContainer.addEventListener("animationend", this);
-    });
+    // CombinedStopReload may have been uninitialized before the idleCallback is executed.
+    if (!this._initialized)
+      return;
+    this.animate = Services.prefs.getBoolPref("toolkit.cosmeticAnimations.enabled") &&
+                   Services.prefs.getBoolPref("browser.stopReloadAnimation.enabled");
+    Services.prefs.addObserver("toolkit.cosmeticAnimations.enabled", this);
+    this.stopReloadContainer.addEventListener("animationend", this);
  },

  onTabSwitch() {
--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@ -1115,7 +1115,7 @@
                       flex="1"/>
            <toolbarbutton type="menu"
                           id="PlacesChevron"
-                           class="chevron"
+                           class="toolbarbutton-1"
                           mousethrough="never"
                           collapsed="true"
                           tooltiptext="&bookmarksToolbarChevron.tooltip;"
--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@ -5948,6 +5948,8 @@

          Services.prefs.addObserver("privacy.userContext", this);
          this.observe(null, "nsPref:changed", "privacy.userContext.enabled");
+
+          this._setPositionalAttributes();
        ]]>
      </constructor>

--- a/browser/base/content/test/performance/browser_startup_images.js
+++ b/browser/base/content/test/performance/browser_startup_images.js
@ -87,14 +87,8 @@ const whitelist = [
  },

  {
-    file: "chrome://global/skin/icons/chevron.png",
-    hidpi: "chrome://global/skin/icons/chevron@2x.png",
-    platforms: ["macosx"],
-  },
-
-  {
-    file: "chrome://global/skin/toolbar/chevron.gif",
-    platforms: ["win", "linux"],
+    file: "chrome://browser/skin/chevron.svg",
+    platforms: ["win", "linux", "macosx"],
  },

  {
--- a/browser/base/content/test/performance/browser_tabstrip_overflow_underflow_reflows.js
+++ b/browser/base/content/test/performance/browser_tabstrip_overflow_underflow_reflows.js
@ -15,17 +15,6 @@ const EXPECTED_OVERFLOW_REFLOWS = [
      "select@chrome://global/content/bindings/textbox.xml",
      "focusAndSelectUrlBar@chrome://browser/content/browser.js",
      "_adjustFocusAfterTabSwitch@chrome://browser/content/tabbrowser.xml",
-      "updateDisplay/<@chrome://browser/content/tabbrowser.xml",
-      "set_selectedIndex@chrome://browser/content/tabbrowser.xml",
-      "set_selectedPanel@chrome://global/content/bindings/tabbox.xml",
-      "set_selectedIndex@chrome://global/content/bindings/tabbox.xml",
-      "set_selectedItem@chrome://global/content/bindings/tabbox.xml",
-      "set_selectedTab@chrome://global/content/bindings/tabbox.xml",
-      "set_selectedTab@chrome://browser/content/tabbrowser.xml",
-      "loadOneTab@chrome://browser/content/tabbrowser.xml",
-      "openLinkIn@chrome://browser/content/utilityOverlay.js",
-      "openUILinkIn@chrome://browser/content/utilityOverlay.js",
-      "BrowserOpenTab@chrome://browser/content/browser.js",
    ]
  },
 ];
--- a/browser/components/nsBrowserGlue.js
+++ b/browser/components/nsBrowserGlue.js
@ -212,8 +212,10 @@ const BOOKMARKS_BACKUP_MIN_INTERVAL_DAYS = 1;
 // Maximum interval between backups.  If the last backup is older than these
 // days we will try to create a new one more aggressively.
 const BOOKMARKS_BACKUP_MAX_INTERVAL_DAYS = 3;
-// Seconds of idle time before reporting media telemetry.
-const MEDIA_TELEMETRY_IDLE_TIME_SEC = 20;
+// Seconds of idle time before the late idle tasks will be scheduled.
+const LATE_TASKS_IDLE_TIME_SEC = 20;
+// Time after we stop tracking startup crashes.
+const STARTUP_CRASHES_END_DELAY_MS = 30 * 1000;

 // Factory object
 const BrowserGlueServiceFactory = {
@ -554,9 +556,13 @@ BrowserGlue.prototype = {
      this._idleService.removeIdleObserver(this, this._bookmarksBackupIdleTime);
      delete this._bookmarksBackupIdleTime;
    }
-    if (this._mediaTelemetryIdleObserver) {
-      this._idleService.removeIdleObserver(this._mediaTelemetryIdleObserver, MEDIA_TELEMETRY_IDLE_TIME_SEC);
-      delete this._mediaTelemetryIdleObserver;
+    if (this._lateTasksIdleObserver) {
+      this._idleService.removeIdleObserver(this._lateTasksIdleObserver, LATE_TASKS_IDLE_TIME_SEC);
+      delete this._lateTasksIdleObserver;
+    }
+    if (this._gmpInstallManager) {
+      this._gmpInstallManager.uninit();
+      delete this._gmpInstallManager;
    }
    try {
      os.removeObserver(this, "places-init-complete");
@ -868,17 +874,6 @@ BrowserGlue.prototype = {
      Services.ppmm.loadProcessScript("resource://pdf.js/pdfjschildbootstrap-enabled.js", true);
    }

-    if (AppConstants.platform == "win") {
-      // For Windows 7, initialize the jump list module.
-      const WINTASKBAR_CONTRACTID = "@mozilla.org/windows-taskbar;1";
-      if (WINTASKBAR_CONTRACTID in Cc &&
-          Cc[WINTASKBAR_CONTRACTID].getService(Ci.nsIWinTaskbar).available) {
-        let temp = {};
-        Cu.import("resource:///modules/WindowsJumpLists.jsm", temp);
-        temp.WinTaskbarJumpList.startup();
-      }
-    }
-
    TabCrashHandler.init();
    if (AppConstants.MOZ_CRASHREPORTER) {
      PluginCrashReporter.init();
@ -951,27 +946,12 @@ BrowserGlue.prototype = {

    this._firstWindowTelemetry(aWindow);
    this._firstWindowLoaded();
-
-    this._mediaTelemetryIdleObserver = {
-      browserGlue: this,
-      observe(aSubject, aTopic, aData) {
-        if (aTopic != "idle") {
-          return;
-        }
-        this.browserGlue._sendMediaTelemetry();
-      }
-    };
-    this._idleService.addIdleObserver(this._mediaTelemetryIdleObserver,
-                                      MEDIA_TELEMETRY_IDLE_TIME_SEC);
  },

  _sendMediaTelemetry() {
    let win = RecentWindow.getMostRecentBrowserWindow();
    let v = win.document.createElementNS("http://www.w3.org/1999/xhtml", "video");
    v.reportCanPlayTelemetry();
-    this._idleService.removeIdleObserver(this._mediaTelemetryIdleObserver,
-                                         MEDIA_TELEMETRY_IDLE_TIME_SEC);
-    delete this._mediaTelemetryIdleObserver;
  },

  /**
@ -1038,10 +1018,6 @@ BrowserGlue.prototype = {
    BrowserUsageTelemetry.init();
    BrowserUITelemetry.init();

-    if (AppConstants.MOZ_DEV_EDITION) {
-      this._createExtraDefaultProfile();
-    }
-
    this._initServiceDiscovery();

    // Show update notification, if needed.
@ -1076,99 +1052,143 @@ BrowserGlue.prototype = {
      this._notifyDisabledNonMpc();
    }

-    // Perform default browser checking.
-    if (ShellService) {
-      let shouldCheck = AppConstants.DEBUG ? false :
-                                             ShellService.shouldCheckDefaultBrowser;
-
-      const skipDefaultBrowserCheck =
-        Services.prefs.getBoolPref("browser.shell.skipDefaultBrowserCheckOnFirstRun") &&
-        !Services.prefs.getBoolPref("browser.shell.didSkipDefaultBrowserCheckOnFirstRun");
-
-      const usePromptLimit = !AppConstants.RELEASE_OR_BETA;
-      let promptCount =
-        usePromptLimit ? Services.prefs.getIntPref("browser.shell.defaultBrowserCheckCount") : 0;
-
-      let willRecoverSession = false;
-      try {
-        let ss = Cc["@mozilla.org/browser/sessionstartup;1"].
-                 getService(Ci.nsISessionStartup);
-        willRecoverSession =
-          (ss.sessionType == Ci.nsISessionStartup.RECOVER_SESSION);
-      } catch (ex) { /* never mind; suppose SessionStore is broken */ }
-
-      // startup check, check all assoc
-      let isDefault = false;
-      let isDefaultError = false;
-      try {
-        isDefault = ShellService.isDefaultBrowser(true, false);
-      } catch (ex) {
-        isDefaultError = true;
-      }
-
-      if (isDefault) {
-        let now = (Math.floor(Date.now() / 1000)).toString();
-        Services.prefs.setCharPref("browser.shell.mostRecentDateSetAsDefault", now);
-      }
-
-      let willPrompt = shouldCheck && !isDefault && !willRecoverSession;
-
-      // Skip the "Set Default Browser" check during first-run or after the
-      // browser has been run a few times.
-      if (willPrompt) {
-        if (skipDefaultBrowserCheck) {
-          Services.prefs.setBoolPref("browser.shell.didSkipDefaultBrowserCheckOnFirstRun", true);
-          willPrompt = false;
-        } else {
-          promptCount++;
-        }
-        if (usePromptLimit && promptCount > 3) {
-          willPrompt = false;
-        }
-      }
-
-      if (usePromptLimit && willPrompt) {
-        Services.prefs.setIntPref("browser.shell.defaultBrowserCheckCount", promptCount);
-      }
-
-      try {
-        // Report default browser status on startup to telemetry
-        // so we can track whether we are the default.
-        Services.telemetry.getHistogramById("BROWSER_IS_USER_DEFAULT")
-                          .add(isDefault);
-        Services.telemetry.getHistogramById("BROWSER_IS_USER_DEFAULT_ERROR")
-                          .add(isDefaultError);
-        Services.telemetry.getHistogramById("BROWSER_SET_DEFAULT_ALWAYS_CHECK")
-                          .add(shouldCheck);
-        Services.telemetry.getHistogramById("BROWSER_SET_DEFAULT_DIALOG_PROMPT_RAWCOUNT")
-                          .add(promptCount);
-      } catch (ex) { /* Don't break the default prompt if telemetry is broken. */ }
-
-      if (willPrompt) {
-        Services.tm.dispatchToMainThread(function() {
-          DefaultBrowserCheck.prompt(RecentWindow.getMostRecentBrowserWindow());
-        });
-      }
-    }
-
    if (AppConstants.MOZ_CRASHREPORTER) {
      UnsubmittedCrashHandler.init();
-      Services.tm.idleDispatchToMainThread(function() {
-        UnsubmittedCrashHandler.checkForUnsubmittedCrashReports();
-      });
    }

-    // Let's load the contextual identities.
+    this._sanitizer.onStartup();
+    E10SAccessibilityCheck.onWindowsRestored();
+
+    this._scheduleStartupIdleTasks();
+
+    this._lateTasksIdleObserver = (idleService, topic, data) => {
+      if (topic == "idle") {
+        idleService.removeIdleObserver(this._lateTasksIdleObserver,
+                                       LATE_TASKS_IDLE_TIME_SEC);
+        delete this._lateTasksIdleObserver;
+        this._scheduleArbitrarilyLateIdleTasks();
+      }
+    };
+    this._idleService.addIdleObserver(
+      this._lateTasksIdleObserver, LATE_TASKS_IDLE_TIME_SEC);
+  },
+
+  /**
+   * Use this function as an entry point to schedule tasks that
+   * need to run only once after startup, and can be scheduled
+   * by using an idle callback.
+   *
+   * The functions scheduled here will fire from idle callbacks
+   * once every window has finished being restored by session
+   * restore, and it's guaranteed that they will run before
+   * the equivalent per-window idle tasks
+   * (from _schedulePerWindowIdleTasks in browser.js).
+   *
+   * If you have something that can wait even further than the
+   * per-window initialization, please schedule them using
+   * _scheduleArbitrarilyLateIdleTasks.
+   * Don't be fooled by thinking that the use of the timeout parameter
+   * will delay your function: it will just ensure that it potentially
+   * happens _earlier_ than expected (when the timeout limit has been reached),
+   * but it will not make it happen later (and out of order) compared
+   * to the other ones scheduled together.
+   */
+  _scheduleStartupIdleTasks() {
    Services.tm.idleDispatchToMainThread(() => {
      ContextualIdentityService.load();
    });

+    // Load the Login Manager data from disk off the main thread, some time
+    // after startup.  If the data is required before this runs, for example
+    // because a restored page contains a password field, it will be loaded on
+    // the main thread, and this initialization request will be ignored.
+    Services.tm.idleDispatchToMainThread(() => {
+      try {
+        Services.logins;
+      } catch (ex) {
+        Cu.reportError(ex);
+      }
+    }, 3000);
+
+    // It's important that SafeBrowsing is initialized reasonably
+    // early, so we use a maximum timeout for it.
    Services.tm.idleDispatchToMainThread(() => {
      SafeBrowsing.init();
    }, 5000);

-    this._sanitizer.onStartup();
-    E10SAccessibilityCheck.onWindowsRestored();
+    if (AppConstants.MOZ_CRASHREPORTER) {
+      Services.tm.idleDispatchToMainThread(() => {
+        UnsubmittedCrashHandler.checkForUnsubmittedCrashReports();
+      });
+    }
+
+    if (AppConstants.platform == "win") {
+      Services.tm.idleDispatchToMainThread(() => {
+        // For Windows 7, initialize the jump list module.
+        const WINTASKBAR_CONTRACTID = "@mozilla.org/windows-taskbar;1";
+        if (WINTASKBAR_CONTRACTID in Cc &&
+            Cc[WINTASKBAR_CONTRACTID].getService(Ci.nsIWinTaskbar).available) {
+          let temp = {};
+          Cu.import("resource:///modules/WindowsJumpLists.jsm", temp);
+          temp.WinTaskbarJumpList.startup();
+        }
+      });
+    }
+
+    if (AppConstants.MOZ_DEV_EDITION) {
+      Services.tm.idleDispatchToMainThread(() => {
+        this._createExtraDefaultProfile();
+      });
+    }
+
+    Services.tm.idleDispatchToMainThread(() => {
+      this._checkForDefaultBrowser();
+    });
+
+    Services.tm.idleDispatchToMainThread(() => {
+      let {setTimeout} = Cu.import("resource://gre/modules/Timer.jsm", {});
+      setTimeout(function() {
+        Services.tm.idleDispatchToMainThread(Services.startup.trackStartupCrashEnd);
+      }, STARTUP_CRASHES_END_DELAY_MS);
+    });
+  },
+
+  /**
+   * Use this function as an entry point to schedule tasks that need
+   * to run once per session, at any arbitrary point in time.
+   * This function will be called from an idle observer. Check the value of
+   * LATE_TASKS_IDLE_TIME_SEC to see the current value for this idle
+   * observer.
+   *
+   * Note: this function may never be called if the user is never idle for the
+   * full length of the period of time specified. But given a reasonably low
+   * value, this is unlikely.
+   */
+  _scheduleArbitrarilyLateIdleTasks() {
+    Services.tm.idleDispatchToMainThread(() => {
+      this._sendMediaTelemetry();
+    });
+
+    Services.tm.idleDispatchToMainThread(() => {
+      // Telemetry for master-password - we do this after a delay as it
+      // can cause IO if NSS/PSM has not already initialized.
+      let tokenDB = Cc["@mozilla.org/security/pk11tokendb;1"]
+                .getService(Ci.nsIPK11TokenDB);
+      let token = tokenDB.getInternalKeyToken();
+      let mpEnabled = token.hasPassword;
+      if (mpEnabled) {
+        Services.telemetry.getHistogramById("MASTER_PASSWORD_ENABLED").add(mpEnabled);
+      }
+    });
+
+    Services.tm.idleDispatchToMainThread(() => {
+      let obj = {};
+      Cu.import("resource://gre/modules/GMPInstallManager.jsm", obj);
+      this._gmpInstallManager = new obj.GMPInstallManager();
+      // We don't really care about the results, if someone is interested they
+      // can check the log.
+      this._gmpInstallManager.simpleCheckAndInstall().catch(() => {});
+    });
  },

  _createExtraDefaultProfile() {
@ -2084,6 +2104,83 @@ BrowserGlue.prototype = {
    Services.prefs.setIntPref("browser.migration.version", UI_VERSION);
  },

+  _checkForDefaultBrowser() {
+    // Perform default browser checking.
+    if (!ShellService) {
+      return;
+    }
+
+    let shouldCheck = AppConstants.DEBUG ? false :
+                                           ShellService.shouldCheckDefaultBrowser;
+
+    const skipDefaultBrowserCheck =
+      Services.prefs.getBoolPref("browser.shell.skipDefaultBrowserCheckOnFirstRun") &&
+      !Services.prefs.getBoolPref("browser.shell.didSkipDefaultBrowserCheckOnFirstRun");
+
+    const usePromptLimit = !AppConstants.RELEASE_OR_BETA;
+    let promptCount =
+      usePromptLimit ? Services.prefs.getIntPref("browser.shell.defaultBrowserCheckCount") : 0;
+
+    let willRecoverSession = false;
+    try {
+      let ss = Cc["@mozilla.org/browser/sessionstartup;1"].
+               getService(Ci.nsISessionStartup);
+      willRecoverSession =
+        (ss.sessionType == Ci.nsISessionStartup.RECOVER_SESSION);
+    } catch (ex) { /* never mind; suppose SessionStore is broken */ }
+
+    // startup check, check all assoc
+    let isDefault = false;
+    let isDefaultError = false;
+    try {
+      isDefault = ShellService.isDefaultBrowser(true, false);
+    } catch (ex) {
+      isDefaultError = true;
+    }
+
+    if (isDefault) {
+      let now = (Math.floor(Date.now() / 1000)).toString();
+      Services.prefs.setCharPref("browser.shell.mostRecentDateSetAsDefault", now);
+    }
+
+    let willPrompt = shouldCheck && !isDefault && !willRecoverSession;
+
+    // Skip the "Set Default Browser" check during first-run or after the
+    // browser has been run a few times.
+    if (willPrompt) {
+      if (skipDefaultBrowserCheck) {
+        Services.prefs.setBoolPref("browser.shell.didSkipDefaultBrowserCheckOnFirstRun", true);
+        willPrompt = false;
+      } else {
+        promptCount++;
+      }
+      if (usePromptLimit && promptCount > 3) {
+        willPrompt = false;
+      }
+    }
+
+    if (usePromptLimit && willPrompt) {
+      Services.prefs.setIntPref("browser.shell.defaultBrowserCheckCount", promptCount);
+    }
+
+    try {
+      // Report default browser status on startup to telemetry
+      // so we can track whether we are the default.
+      Services.telemetry.getHistogramById("BROWSER_IS_USER_DEFAULT")
+                        .add(isDefault);
+      Services.telemetry.getHistogramById("BROWSER_IS_USER_DEFAULT_ERROR")
+                        .add(isDefaultError);
+      Services.telemetry.getHistogramById("BROWSER_SET_DEFAULT_ALWAYS_CHECK")
+                        .add(shouldCheck);
+      Services.telemetry.getHistogramById("BROWSER_SET_DEFAULT_DIALOG_PROMPT_RAWCOUNT")
+                        .add(promptCount);
+    } catch (ex) { /* Don't break the default prompt if telemetry is broken. */ }
+
+    if (willPrompt) {
+      DefaultBrowserCheck.prompt(RecentWindow.getMostRecentBrowserWindow());
+    }
+  },
+
  // ------------------------------
  // public nsIBrowserGlue members
  // ------------------------------
--- a/browser/components/sessionstore/SessionStore.jsm
+++ b/browser/components/sessionstore/SessionStore.jsm
@ -214,6 +214,10 @@ this.SessionStore = {
    return SessionStoreInternal.promiseInitialized;
  },

+  get promiseAllWindowsRestored() {
+    return SessionStoreInternal.promiseAllWindowsRestored;
+  },
+
  get canRestoreLastSession() {
    return SessionStoreInternal.canRestoreLastSession;
  },
@ -532,6 +536,22 @@ var SessionStoreInternal = {
  // Whether session has been initialized
  _sessionInitialized: false,

+  // A promise resolved once all windows are restored.
+  _deferredAllWindowsRestored: (function() {
+    let deferred = {};
+
+    deferred.promise = new Promise((resolve, reject) => {
+      deferred.resolve = resolve;
+      deferred.reject = reject;
+    });
+
+    return deferred;
+  })(),
+
+  get promiseAllWindowsRestored() {
+    return this._deferredAllWindowsRestored.promise;
+  },
+
  // Promise that is resolved when we're ready to initialize
  // and restore the session.
  _promiseReadyForInitialization: null,
@ -1129,6 +1149,7 @@ var SessionStoreInternal = {

          // Nothing to restore now, notify observers things are complete.
          Services.obs.notifyObservers(null, NOTIFY_WINDOWS_RESTORED);
+          this._deferredAllWindowsRestored.resolve();
        } else {
          TelemetryTimestamps.add("sessionRestoreRestoring");
          this._restoreCount = aInitialState.windows ? aInitialState.windows.length : 0;
@ -1147,6 +1168,7 @@ var SessionStoreInternal = {
      } else {
        // Nothing to restore, notify observers things are complete.
        Services.obs.notifyObservers(null, NOTIFY_WINDOWS_RESTORED);
+        this._deferredAllWindowsRestored.resolve();
      }
    // this window was opened by _openWindowWithState
    } else if (!this._isWindowLoaded(aWindow)) {
@ -4450,8 +4472,15 @@ var SessionStoreInternal = {
      return;

    // This was the last window restored at startup, notify observers.
-    Services.obs.notifyObservers(null,
-      this._browserSetState ? NOTIFY_BROWSER_STATE_RESTORED : NOTIFY_WINDOWS_RESTORED);
+    if (!this._browserSetState) {
+      Services.obs.notifyObservers(null, NOTIFY_WINDOWS_RESTORED);
+      this._deferredAllWindowsRestored.resolve();
+    } else {
+      // _browserSetState is used only by tests, and it uses an alternate
+      // notification in order not to retrigger startup observers that
+      // are listening for NOTIFY_WINDOWS_RESTORED.
+      Services.obs.notifyObservers(null, NOTIFY_BROWSER_STATE_RESTORED);
+    }

    this._browserSetState = false;
    this._restoreCount = -1;
--- a/browser/extensions/formautofill/FormAutofillContent.jsm
+++ b/browser/extensions/formautofill/FormAutofillContent.jsm
@ -385,29 +385,12 @@ var FormAutofillContent = {
      return true;
    }

-    let {addressRecord, creditCardRecord} = handler.createRecords();
-
-    if (!addressRecord && !creditCardRecord) {
+    let records = handler.createRecords();
+    if (!Object.keys(records).length) {
      return true;
    }

-    let data = {};
-    if (addressRecord) {
-      data.address = {
-        guid: handler.address.filledRecordGUID,
-        record: addressRecord,
-      };
-    }
-
-    if (creditCardRecord) {
-      data.creditCard = {
-        guid: handler.creditCard.filledRecordGUID,
-        record: creditCardRecord,
-      };
-    }
-
-    this._onFormSubmit(data, domWin);
-
+    this._onFormSubmit(records, domWin);
    return true;
  },

--- a/browser/extensions/formautofill/FormAutofillHandler.jsm
+++ b/browser/extensions/formautofill/FormAutofillHandler.jsm
@ -451,10 +451,16 @@ FormAutofillHandler.prototype = {
   * Return the records that is converted from address/creditCard fieldDetails and
   * only valid form records are included.
   *
-   * @returns {Object} The new profile that convert from details with trimmed result.
+   * @returns {Object}
+   *          Consists of two record objects: address, creditCard. Each one can
+   *          be omitted if there's no valid fields. A record object consists of
+   *          three properties:
+   *            - guid: The id of the previously-filled profile or null if omitted.
+   *            - record: A valid record converted from details with trimmed result.
+   *            - untouchedFields: Fields that aren't touched after autofilling.
   */
  createRecords() {
-    let records = {};
+    let data = {};

    ["address", "creditCard"].forEach(type => {
      let details = this[type].fieldDetails;
@ -462,8 +468,12 @@ FormAutofillHandler.prototype = {
        return;
      }

-      let recordName = `${type}Record`;
-      records[recordName] = {};
+      data[type] = {
+        guid: this[type].filledRecordGUID,
+        record: {},
+        untouchedFields: [],
+      };
+
      details.forEach(detail => {
        let element = detail.elementWeakRef.get();
        // Remove the unnecessary spaces
@ -472,23 +482,27 @@ FormAutofillHandler.prototype = {
          return;
        }

-        records[recordName][detail.fieldName] = value;
+        data[type].record[detail.fieldName] = value;
+
+        if (detail.state == "AUTO_FILLED") {
+          data[type].untouchedFields.push(detail.fieldName);
+        }
      });
    });

-    if (records.addressRecord &&
-        Object.keys(records.addressRecord).length < FormAutofillUtils.AUTOFILL_FIELDS_THRESHOLD) {
+    if (data.address &&
+        Object.keys(data.address.record).length < FormAutofillUtils.AUTOFILL_FIELDS_THRESHOLD) {
      log.debug("No address record saving since there are only",
-                     Object.keys(records.addressRecord).length,
+                     Object.keys(data.address.record).length,
                     "usable fields");
-      delete records.addressRecord;
+      delete data.address;
    }

-    if (records.creditCardRecord && !records.creditCardRecord["cc-number"]) {
+    if (data.creditCard && !data.creditCard.record["cc-number"]) {
      log.debug("No credit card record saving since card number is empty");
-      delete records.creditCardRecord;
+      delete data.creditCard;
    }

-    return records;
+    return data;
  },
 };
--- a/browser/extensions/formautofill/FormAutofillParent.jsm
+++ b/browser/extensions/formautofill/FormAutofillParent.jsm
@ -286,6 +286,14 @@ FormAutofillParent.prototype = {
    let {address} = data;

    if (address.guid) {
+      // Avoid updating the fields that users don't modify.
+      let originalAddress = this.profileStorage.addresses.get(address.guid);
+      for (let field in address.record) {
+        if (address.untouchedFields.includes(field) && originalAddress[field]) {
+          address.record[field] = originalAddress[field];
+        }
+      }
+
      if (!this.profileStorage.addresses.mergeIfPossible(address.guid, address.record)) {
        FormAutofillDoorhanger.show(target, "update").then((state) => {
          let changedGUIDs = this.profileStorage.addresses.mergeToStorage(address.record);
--- a/browser/extensions/formautofill/ProfileStorage.jsm
+++ b/browser/extensions/formautofill/ProfileStorage.jsm
@ -1375,10 +1375,25 @@ class Addresses extends AutofillRecords {
    let hasMatchingField = false;

    for (let field of this.VALID_FIELDS) {
-      if (addressToMerge[field] !== undefined && addressFound[field] !== undefined) {
-        if (addressToMerge[field] != addressFound[field]) {
-          this.log.debug("Conflicts: field", field, "has different value.");
-          return false;
+      let existingField = addressFound[field];
+      let incomingField = addressToMerge[field];
+      if (incomingField !== undefined && existingField !== undefined) {
+        if (incomingField != existingField) {
+          // Treat "street-address" as mergeable if their single-line versions
+          // match each other.
+          if (field == "street-address" &&
+              FormAutofillUtils.toOneLineAddress(existingField) == FormAutofillUtils.toOneLineAddress(incomingField)) {
+            // Keep the value in storage if its amount of lines is greater than
+            // or equal to the incoming one.
+            if (existingField.split("\n").length >= incomingField.split("\n").length) {
+              // Replace the incoming field with the one in storage so it will
+              // be further merged back to storage.
+              addressToMerge[field] = existingField;
+            }
+          } else {
+            this.log.debug("Conflicts: field", field, "has different value.");
+            return false;
+          }
        }
        hasMatchingField = true;
      }
--- a/browser/extensions/formautofill/test/browser/browser_update_doorhanger.js
+++ b/browser/extensions/formautofill/test/browser/browser_update_doorhanger.js
@ -19,7 +19,7 @@ add_task(async function test_update_address() {
        let form = content.document.getElementById("form");
        let org = form.querySelector("#organization");
        await new Promise(resolve => setTimeout(resolve, 1000));
-        org.value = "Mozilla";
+        org.setUserInput("Mozilla");

        // Wait 1000ms before submission to make sure the input value applied
        await new Promise(resolve => setTimeout(resolve, 1000));
@ -52,7 +52,7 @@ add_task(async function test_create_new_address() {
        let form = content.document.getElementById("form");
        let tel = form.querySelector("#tel");
        await new Promise(resolve => setTimeout(resolve, 1000));
-        tel.value = "+1-234-567-890";
+        tel.setUserInput("+1234567890");

        // Wait 1000ms before submission to make sure the input value applied
        await new Promise(resolve => setTimeout(resolve, 1000));
@ -66,7 +66,7 @@ add_task(async function test_create_new_address() {

  addresses = await getAddresses();
  is(addresses.length, 2, "2 addresses in storage");
-  is(addresses[1].tel, "+1-234-567-890", "Verify the tel field");
+  is(addresses[1].tel, "+1234567890", "Verify the tel field");
 });

 add_task(async function test_create_new_address_merge() {
@ -85,7 +85,7 @@ add_task(async function test_create_new_address_merge() {
      await ContentTask.spawn(browser, null, async function() {
        let form = content.document.getElementById("form");
        let tel = form.querySelector("#tel");
-        tel.value = "+1 617 253 5702";
+        tel.setUserInput("+16172535702");

        // Wait 1000ms before submission to make sure the input value applied
        await new Promise(resolve => setTimeout(resolve, 1000));
@ -100,3 +100,41 @@ add_task(async function test_create_new_address_merge() {
  addresses = await getAddresses();
  is(addresses.length, 2, "Still 2 addresses in storage");
 });
+
+add_task(async function test_submit_untouched_fields() {
+  let addresses = await getAddresses();
+  is(addresses.length, 2, "2 addresses in storage");
+
+  await BrowserTestUtils.withNewTab({gBrowser, url: FORM_URL},
+    async function(browser) {
+      let promiseShown = BrowserTestUtils.waitForEvent(PopupNotifications.panel,
+                                                       "popupshown");
+      await openPopupOn(browser, "form #organization");
+      await BrowserTestUtils.synthesizeKey("VK_DOWN", {}, browser);
+      await BrowserTestUtils.synthesizeKey("VK_RETURN", {}, browser);
+
+      await ContentTask.spawn(browser, null, async function() {
+        let form = content.document.getElementById("form");
+        let org = form.querySelector("#organization");
+        await new Promise(resolve => setTimeout(resolve, 1000));
+        org.setUserInput("Organization");
+
+        let tel = form.querySelector("#tel");
+        await new Promise(resolve => setTimeout(resolve, 1000));
+        tel.value = "12345"; // ".value" won't change the highlight status.
+
+        // Wait 1000ms before submission to make sure the input value applied
+        await new Promise(resolve => setTimeout(resolve, 1000));
+        form.querySelector("input[type=submit]").click();
+      });
+
+      await promiseShown;
+      await clickDoorhangerButton(MAIN_BUTTON_INDEX);
+    }
+  );
+
+  addresses = await getAddresses();
+  is(addresses.length, 2, "Still 2 addresses in storage");
+  is(addresses[0].organization, "Organization", "organization should change");
+  is(addresses[0].tel, "+16172535702", "tel should remain unchanged");
+});
--- a/browser/extensions/formautofill/test/unit/test_addressRecords.js
+++ b/browser/extensions/formautofill/test/unit/test_addressRecords.js
@ -102,6 +102,101 @@ const MERGE_TESTCASES = [
      country: "US",
    },
  },
+  {
+    description: "Merge an address with multi-line street-address in storage and single-line incoming one",
+    addressInStorage: {
+      "given-name": "Timothy",
+      "street-address": "331 E. Evelyn Avenue\nLine2",
+      "tel": "+16509030800",
+    },
+    addressToMerge: {
+      "street-address": "331 E. Evelyn Avenue Line2",
+      "tel": "+16509030800",
+      country: "US",
+    },
+    expectedAddress: {
+      "given-name": "Timothy",
+      "street-address": "331 E. Evelyn Avenue\nLine2",
+      "tel": "+16509030800",
+      country: "US",
+    },
+  },
+  {
+    description: "Merge an address with 3-line street-address in storage and 2-line incoming one",
+    addressInStorage: {
+      "given-name": "Timothy",
+      "street-address": "331 E. Evelyn Avenue\nLine2\nLine3",
+      "tel": "+16509030800",
+    },
+    addressToMerge: {
+      "street-address": "331 E. Evelyn Avenue\nLine2 Line3",
+      "tel": "+16509030800",
+      country: "US",
+    },
+    expectedAddress: {
+      "given-name": "Timothy",
+      "street-address": "331 E. Evelyn Avenue\nLine2\nLine3",
+      "tel": "+16509030800",
+      country: "US",
+    },
+  },
+  {
+    description: "Merge an address with single-line street-address in storage and multi-line incoming one",
+    addressInStorage: {
+      "given-name": "Timothy",
+      "street-address": "331 E. Evelyn Avenue Line2",
+      "tel": "+16509030800",
+    },
+    addressToMerge: {
+      "street-address": "331 E. Evelyn Avenue\nLine2",
+      "tel": "+16509030800",
+      country: "US",
+    },
+    expectedAddress: {
+      "given-name": "Timothy",
+      "street-address": "331 E. Evelyn Avenue\nLine2",
+      "tel": "+16509030800",
+      country: "US",
+    },
+  },
+  {
+    description: "Merge an address with 2-line street-address in storage and 3-line incoming one",
+    addressInStorage: {
+      "given-name": "Timothy",
+      "street-address": "331 E. Evelyn Avenue\nLine2 Line3",
+      "tel": "+16509030800",
+    },
+    addressToMerge: {
+      "street-address": "331 E. Evelyn Avenue\nLine2\nLine3",
+      "tel": "+16509030800",
+      country: "US",
+    },
+    expectedAddress: {
+      "given-name": "Timothy",
+      "street-address": "331 E. Evelyn Avenue\nLine2\nLine3",
+      "tel": "+16509030800",
+      country: "US",
+    },
+  },
+  {
+    description: "Merge an address with the same amount of lines",
+    addressInStorage: {
+      "given-name": "Timothy",
+      "street-address": "331 E. Evelyn Avenue\nLine2\nLine3",
+      "tel": "+16509030800",
+    },
+    addressToMerge: {
+      "street-address": "331 E. Evelyn\nAvenue Line2\nLine3",
+      "tel": "+16509030800",
+      country: "US",
+    },
+    expectedAddress: {
+      "given-name": "Timothy",
+      "street-address": "331 E. Evelyn Avenue\nLine2\nLine3",
+      "tel": "+16509030800",
+      country: "US",
+    },
+  },
 ];

 let do_check_record_matches = (recordWithMeta, record) => {
--- a/browser/extensions/formautofill/test/unit/test_onFormSubmitted.js
+++ b/browser/extensions/formautofill/test/unit/test_onFormSubmitted.js
@ -56,6 +56,7 @@ const TESTCASES = [
            "country": "USA",
            "tel": "1-650-903-0800",
          },
+          untouchedFields: [],
        },
      },
    },
@ -79,6 +80,7 @@ const TESTCASES = [
            "cc-exp-month": 12,
            "cc-exp-year": 2000,
          },
+          untouchedFields: [],
        },
      },
    },
@ -104,6 +106,7 @@ const TESTCASES = [
            "country": "USA",
            "tel": "1-650-903-0800",
          },
+          untouchedFields: [],
        },
        creditCard: {
          guid: null,
@ -113,6 +116,7 @@ const TESTCASES = [
            "cc-exp-month": 12,
            "cc-exp-year": 2000,
          },
+          untouchedFields: [],
        },
      },
    },
@ -134,6 +138,7 @@ const TESTCASES = [
            "country": "USA",
            "tel": "1-650-903-0800",
          },
+          untouchedFields: [],
        },
      },
    },
@ -156,6 +161,7 @@ const TESTCASES = [
            "country": "USA",
            "tel": "1-650-903-0800",
          },
+          untouchedFields: [],
        },
      },
    },
--- a/browser/installer/package-manifest.in
+++ b/browser/installer/package-manifest.in
@ -396,8 +396,10 @@
@RESPATH@/components/nsSearchService.js
@RESPATH@/components/nsSearchSuggestions.js
@RESPATH@/components/nsSidebar.js
+#ifdef NIGHTLY_BUILD
@RESPATH@/components/payments.manifest
@RESPATH@/components/paymentUIService.js
+#endif
@RESPATH@/components/passwordmgr.manifest
@RESPATH@/components/nsLoginInfo.js
@RESPATH@/components/nsLoginManager.js
--- a/browser/themes/linux/browser.css
+++ b/browser/themes/linux/browser.css
@ -10,8 +10,6 @@
@namespace html url("http://www.w3.org/1999/xhtml");
@namespace svg url("http://www.w3.org/2000/svg");

-%include ../shared/browser.inc
-
 %include ../shared/browser.inc.css

 :root {
@ -812,28 +810,6 @@ html|span.ac-emphasize-text-url {
  font-weight: bold;
 }

-
-toolbarbutton.chevron {
-  list-style-image: url("chrome://global/skin/toolbar/chevron.gif") !important;
-}
-
-toolbar[brighttext] toolbarbutton.chevron {
-  list-style-image: url("chrome://global/skin/toolbar/chevron-inverted.png") !important;
-}
-
-toolbarbutton.chevron:-moz-locale-dir(rtl) > .toolbarbutton-icon {
-  transform: scaleX(-1);
-}
-
-toolbarbutton.chevron > .toolbarbutton-text,
-toolbarbutton.chevron > .toolbarbutton-menu-dropmarker {
-  display: none;
-}
-
-toolbarbutton.chevron > .toolbarbutton-icon {
-  margin: 0;
-}
-
 /* Status panel */

 .statuspanel-label {
--- a/browser/themes/osx/browser.css
+++ b/browser/themes/osx/browser.css
@ -195,38 +195,6 @@
  -moz-box-align: center;
 }

-toolbarbutton.chevron {
-  list-style-image: url("chrome://global/skin/icons/chevron.png");
-  margin: 1px 0 0;
-  padding: 0;
-}
-
-toolbar[brighttext] toolbarbutton.chevron {
-  list-style-image: url("chrome://global/skin/icons/chevron-inverted.png");
-}
-
-toolbarbutton.chevron > .toolbarbutton-text {
-  display: none;
-}
-
-toolbarbutton.chevron:-moz-locale-dir(rtl) > .toolbarbutton-icon {
-  transform: scaleX(-1);
-}
-
-@media (min-resolution: 2dppx) {
-  toolbarbutton.chevron {
-    list-style-image: url("chrome://global/skin/icons/chevron@2x.png");
-  }
-
-  toolbar[brighttext] toolbarbutton.chevron {
-    list-style-image: url("chrome://global/skin/icons/chevron-inverted@2x.png");
-  }
-
-  toolbarbutton.chevron > .toolbarbutton-icon {
-    width: 13px;
-  }
-}
-
 /* ----- BOOKMARK BUTTONS ----- */

 .bookmark-item[container] {
@ -1072,10 +1040,6 @@ html|span.ac-emphasize-text-url {
  text-shadow: none;
 }

-toolbarbutton.chevron > .toolbarbutton-menu-dropmarker {
-  display: none;
-}
-
 .bookmark-item {
  list-style-image: url("chrome://mozapps/skin/places/defaultFavicon.svg");
 }
--- a/browser/themes/osx/shared.inc
+++ b/browser/themes/osx/shared.inc
@ -1,5 +1,4 @@
 %include ../../../toolkit/themes/osx/global/shared.inc
-%include ../shared/browser.inc

 %filter substitution

--- a/browser/themes/shared/browser.inc
+++ b/browser/themes/shared/browser.inc
@ -1,8 +0,0 @@
-%filter substitution
-
-% Note that zoom-reset-button is a bit different since it doesn't use an image and thus has the image with display: none.
-%define nestedButtons #zoom-out-button, #zoom-reset-button, #zoom-in-button, #cut-button, #copy-button, #paste-button
-
-%define inAnyPanel :-moz-any(:not([cui-areatype="toolbar"]), [overflowedItem=true])
-
-%define panelPaletteIconSize var(--panel-palette-icon-size)
--- a/browser/themes/shared/customizableui/panelUI.inc.css
+++ b/browser/themes/shared/customizableui/panelUI.inc.css
@ -17,8 +17,8 @@
 %define buttonStateActive :not([disabled]):-moz-any([open],:hover:active)
 %define menuStateActive :not([disabled])[_moz-menuactive]:active
 %define menuStateMenuActive :not([disabled])[_moz-menuactive]
-
-%include ../browser.inc
+%define inAnyPanel :-moz-any(:not([cui-areatype="toolbar"]), [overflowedItem=true])
+%define panelPaletteIconSize 16px

 :root {
  --panel-ui-exit-subview-gutter-width: 38px;
@ -26,7 +26,6 @@
  --appmenu-yellow-warning-color: #FFEFBF;
  --appmenu-yellow-warning-hover-color: #FFE8A2;
  --appmenu-yellow-warning-active-color: #FFE38F;
-  --panel-palette-icon-size: 16px;
 }

 #PanelUI-popup #PanelUI-contents:empty {
--- a/browser/themes/shared/icons/chevron-animation.svg
+++ b/browser/themes/shared/icons/chevron-animation.svg
@ -1,218 +1,221 @@
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<svg xmlns="http://www.w3.org/2000/svg" width="1260" height="36" fill="context-fill">
+<svg xmlns="http://www.w3.org/2000/svg" width="1278" height="36" fill="context-fill">
  <svg>
-    <path d="M9.714 17.335l-4.948 -5.052a1 1 0 1 0 -1.429 1.4l4.25 4.337 -4.338 4.248a1 1 0 0 0 -0.04 1.414 1 1 0 0 0 1.414 0.04l0.025 -0.025 5.052 -4.948a1 1 0 0 0 0.014 -1.414zm6 0.062l-4.948 -5.051a1 1 0 1 0 -1.429 1.4l4.249 4.336 -4.338 4.248a1 1 0 0 0 -0.04 1.414 1 1 0 0 0 1.415 0.04l0.025 -0.025 5.051 -4.948a1 1 0 0 0 0.015 -1.414z"/>
+    <path d="M9.707 17.293l-5 -5a1 1 0 1 0 -1.414 1.414l4.293 4.293 -4.293 4.293a1 1 0 0 0 -0.025 1.414 1 1 0 0 0 1.414 0.025l0.025 -0.025 5 -5a1 1 0 0 0 0 -1.414zm6 0l-5 -5a1 1 0 1 0 -1.414 1.414l4.293 4.293 -4.293 4.293a1 1 0 0 0 -0.025 1.414 1 1 0 0 0 1.414 0.025l0.025 -0.025 5 -5a1 1 0 0 0 0 -1.414z"/>
  </svg>
  <svg x="18">
-    <path d="M9.735 17.456l-4.796 -5.196a1 1 0 1 0 -1.47 1.356l4.118 4.461 -4.461 4.118a1 1 0 0 0 -0.082 1.412 1 1 0 0 0 1.412 0.081c0.01 -0.007 0.017 -0.016 0.026 -0.024l5.196 -4.795a1 1 0 0 0 0.057 -1.413zm5.995 0.24l-4.796 -5.196a1 1 0 1 0 -1.47 1.356l4.118 4.462 -4.461 4.117a1 1 0 0 0 -0.082 1.412 1 1 0 0 0 1.412 0.082l0.026 -0.024 5.196 -4.796a1 1 0 0 0 0.057 -1.413z"/>
+    <path d="M9.714 17.3l-4.948 -5.051a1 1 0 1 0 -1.429 1.4l4.25 4.336 -4.338 4.249a1 1 0 0 0 -0.04 1.413 1 1 0 0 0 1.414 0.04l0.025 -0.025 5.052 -4.948a1 1 0 0 0 0.014 -1.414zm6 0.063l-4.948 -5.052a1 1 0 1 0 -1.429 1.4l4.249 4.337 -4.338 4.248a1 1 0 0 0 -0.04 1.413 1 1 0 0 0 1.415 0.04l0.025 -0.025 5.051 -4.948a1 1 0 0 0 0.015 -1.413z"/>
  </svg>
  <svg x="36">
-    <path d="M9.766 17.648l-4.546 -5.416a1 1 0 1 0 -1.532 1.286l3.903 4.65 -4.65 3.903a1 1 0 0 0 -0.148 1.407 1 1 0 0 0 1.407 0.148c0.01 -0.007 0.018 -0.016 0.027 -0.023l5.416 -4.546a1 1 0 0 0 0.123 -1.409zm5.977 0.522l-4.546 -5.416a1 1 0 1 0 -1.532 1.286l3.904 4.65 -4.65 3.903a1 1 0 0 0 -0.149 1.407 1 1 0 0 0 1.407 0.148c0.01 -0.007 0.018 -0.016 0.027 -0.023l5.416 -4.546a1 1 0 0 0 0.123 -1.409z"/>
+    <path d="M9.735 17.322l-4.796 -5.196a1 1 0 1 0 -1.47 1.356l4.118 4.461 -4.461 4.118a1 1 0 0 0 -0.082 1.412 1 1 0 0 0 1.412 0.081c0.01 -0.007 0.017 -0.016 0.026 -0.024l5.196 -4.795a1 1 0 0 0 0.057 -1.413zm5.995 0.24l-4.796 -5.196a1 1 0 1 0 -1.47 1.356l4.118 4.462 -4.461 4.117a1 1 0 0 0 -0.082 1.412 1 1 0 0 0 1.412 0.082l0.026 -0.024 5.196 -4.796a1 1 0 0 0 0.057 -1.413z"/>
  </svg>
  <svg x="54">
-    <path d="M9.804 17.905l-4.2 -5.688a1 1 0 1 0 -1.609 1.188l3.607 4.884 -4.884 3.606a1 1 0 0 0 -0.236 1.395 1 1 0 0 0 1.395 0.235l0.028 -0.021 5.689 -4.2a1 1 0 0 0 0.21 -1.399zm5.934 0.894l-4.2 -5.689a1 1 0 1 0 -1.609 1.188l3.606 4.884 -4.884 3.606a1 1 0 0 0 -0.235 1.395 1 1 0 0 0 1.394 0.235l0.029 -0.021 5.688 -4.2a1 1 0 0 0 0.21 -1.398z"/>
+    <path d="M9.766 17.357l-4.546 -5.416a1 1 0 1 0 -1.532 1.286l3.903 4.65 -4.65 3.903a1 1 0 0 0 -0.148 1.407 1 1 0 0 0 1.407 0.148l0.027 -0.023 5.416 -4.546a1 1 0 0 0 0.123 -1.409zm5.977 0.522l-4.546 -5.416a1 1 0 1 0 -1.532 1.286l3.904 4.65 -4.65 3.903a1 1 0 0 0 -0.149 1.407 1 1 0 0 0 1.407 0.148l0.027 -0.023 5.416 -4.546a1 1 0 0 0 0.123 -1.409z"/>
  </svg>
  <svg x="72">
-    <path d="M9.847 18.22l-3.76 -5.989a1 1 0 1 0 -1.694 1.063l3.229 5.142 -5.143 3.228a1 1 0 0 0 -0.34 1.373 1 1 0 0 0 1.373 0.34c0.011 -0.006 0.02 -0.013 0.03 -0.02l5.99 -3.758a1 1 0 0 0 0.315 -1.379zm5.849 1.338l-3.76 -5.989a1 1 0 1 0 -1.694 1.063l3.229 5.142 -5.143 3.228a1 1 0 0 0 -0.34 1.373 1 1 0 0 0 1.373 0.34l0.03 -0.02 5.99 -3.758a1 1 0 0 0 0.315 -1.379z"/>
+    <path d="M9.804 17.406l-4.2 -5.688a1 1 0 1 0 -1.609 1.188l3.607 4.884 -4.884 3.606a1 1 0 0 0 -0.236 1.394 1 1 0 0 0 1.395 0.235l0.028 -0.02 5.689 -4.2a1 1 0 0 0 0.21 -1.399zm5.934 0.893l-4.2 -5.688a1 1 0 1 0 -1.609 1.188l3.606 4.884 -4.884 3.606a1 1 0 0 0 -0.235 1.394 1 1 0 0 0 1.394 0.236l0.029 -0.021 5.688 -4.2a1 1 0 0 0 0.21 -1.399z"/>
  </svg>
  <svg x="90">
-    <path d="M9.89 18.585l-3.227 -6.292a1 1 0 1 0 -1.78 0.912l2.771 5.403 -5.402 2.77a1 1 0 0 0 -0.458 1.338 1 1 0 0 0 1.339 0.458l0.031 -0.016 6.292 -3.227a1 1 0 0 0 0.434 -1.346zm5.71 1.84l-3.226 -6.293a1 1 0 1 0 -1.78 0.912l2.771 5.403 -5.402 2.77a1 1 0 0 0 -0.457 1.339 1 1 0 0 0 1.338 0.457l0.031 -0.016 6.292 -3.227a1 1 0 0 0 0.434 -1.345z"/>
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  </svg>
  <svg x="108">
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  </svg>
  <svg x="126">
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+    <path d="M9.962 17.728l-1.92 -6.805a1 1 0 1 0 -1.925 0.543l1.65 5.843 -5.844 1.65a1 1 0 0 0 -0.712 1.221 1 1 0 0 0 1.221 0.712c0.012 -0.002 0.023 -0.006 0.034 -0.01l6.806 -1.92a1 1 0 0 0 0.69 -1.234zm5.236 2.931l-1.92 -6.805a1 1 0 1 0 -1.925 0.543l1.649 5.843 -5.843 1.65a1 1 0 0 0 -0.713 1.22 1 1 0 0 0 1.222 0.713c0.012 -0.002 0.023 -0.006 0.034 -0.01l6.805 -1.92a1 1 0 0 0 0.69 -1.234z"/>
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  <svg x="162">
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-    <path d="M9.737 23.778l4.775 -5.215a1 1 0 1 0 -1.475 -1.35l-4.1 4.477 -4.477 -4.1a1 1 0 0 0 -1.414 0.038 1 1 0 0 0 0.037 1.413l0.027 0.024 5.215 4.775a1 1 0 0 0 1.412 -0.062zm0.265 5.994l4.775 -5.215a1 1 0 1 0 -1.475 -1.35l-4.1 4.477 -4.478 -4.1a1 1 0 0 0 -1.414 0.038 1 1 0 0 0 0.038 1.414l0.026 0.023 5.215 4.775a1 1 0 0 0 1.413 -0.062z"/>
+    <path d="M9.707 18.707l5 -5a1 1 0 1 0 -1.414 -1.414l-4.293 4.293 -4.293 -4.293a1 1 0 0 0 -1.414 -0.025 1 1 0 0 0 -0.025 1.414l0.025 0.025 5 5a1 1 0 0 0 1.414 0zm0 6l5 -5a1 1 0 1 0 -1.414 -1.414l-4.293 4.293 -4.293 -4.293a1 1 0 0 0 -1.414 -0.025 1 1 0 0 0 -0.025 1.414l0.025 0.025 5 5a1 1 0 0 0 1.414 0z"/>
  </svg>
  <svg x="1098">
-    <path d="M9.813 23.286l4.12 -5.747a1 1 0 1 0 -1.625 -1.165l-3.538 4.934 -4.935 -3.537a1 1 0 0 0 -1.399 0.206 1 1 0 0 0 0.206 1.4c0.009 0.007 0.02 0.013 0.028 0.02l5.748 4.12a1 1 0 0 0 1.395 -0.231zm0.976 5.92l4.12 -5.747a1 1 0 1 0 -1.625 -1.165l-3.537 4.934 -4.935 -3.537a1 1 0 0 0 -1.4 0.206 1 1 0 0 0 0.206 1.4l0.029 0.02 5.747 4.12a1 1 0 0 0 1.395 -0.231z"/>
+    <path d="M9.737 18.675l4.775 -5.215a1 1 0 1 0 -1.475 -1.35l-4.1 4.477 -4.477 -4.1a1 1 0 0 0 -1.414 0.038 1 1 0 0 0 0.037 1.414l0.027 0.023 5.215 4.775a1 1 0 0 0 1.412 -0.062zm0.265 5.994l4.775 -5.215a1 1 0 1 0 -1.475 -1.35l-4.1 4.478 -4.478 -4.1a1 1 0 0 0 -1.414 0.037 1 1 0 0 0 0.038 1.414l0.026 0.024 5.215 4.775a1 1 0 0 0 1.413 -0.063z"/>
  </svg>
  <svg x="1116">
-    <path d="M9.902 22.547l3.05 -6.38a1 1 0 1 0 -1.804 -0.862l-2.619 5.477 -5.477 -2.618a1 1 0 0 0 -1.342 0.447 1 1 0 0 0 0.447 1.341l0.032 0.016 6.38 3.05a1 1 0 0 0 1.333 -0.471zm1.998 5.657l3.05 -6.38a1 1 0 1 0 -1.804 -0.862l-2.619 5.478 -5.477 -2.619a1 1 0 0 0 -1.342 0.447 1 1 0 0 0 0.447 1.342c0.01 0.006 0.022 0.01 0.032 0.015l6.38 3.05a1 1 0 0 0 1.333 -0.47z"/>
+    <path d="M9.813 18.582l4.12 -5.747a1 1 0 1 0 -1.625 -1.165l-3.538 4.935 -4.935 -3.537a1 1 0 0 0 -1.399 0.205 1 1 0 0 0 0.206 1.4l0.028 0.02 5.748 4.12a1 1 0 0 0 1.395 -0.23zm0.976 5.92l4.12 -5.747a1 1 0 1 0 -1.625 -1.165l-3.537 4.935 -4.935 -3.537a1 1 0 0 0 -1.4 0.205 1 1 0 0 0 0.206 1.4l0.029 0.02 5.747 4.12a1 1 0 0 0 1.395 -0.23z"/>
  </svg>
  <svg x="1134">
-    <path d="M9.973 21.632l1.628 -6.881a1 1 0 1 0 -1.946 -0.46l-1.398 5.907 -5.908 -1.398a1 1 0 0 0 -1.216 0.722 1 1 0 0 0 0.721 1.216c0.012 0.004 0.024 0.006 0.035 0.008l6.88 1.629a1 1 0 0 0 1.204 -0.743zm3.152 5.106l1.628 -6.882a1 1 0 1 0 -1.946 -0.46l-1.398 5.908 -5.908 -1.398a1 1 0 0 0 -1.217 0.721 1 1 0 0 0 0.722 1.217l0.034 0.008 6.881 1.628a1 1 0 0 0 1.204 -0.742z"/>
+    <path d="M9.902 18.431l3.05 -6.38a1 1 0 1 0 -1.804 -0.862l-2.619 5.478 -5.477 -2.619a1 1 0 0 0 -1.342 0.447 1 1 0 0 0 0.447 1.342c0.01 0.006 0.022 0.01 0.032 0.015l6.38 3.05a1 1 0 0 0 1.333 -0.47zm1.998 5.658l3.05 -6.38a1 1 0 1 0 -1.804 -0.862l-2.619 5.477 -5.477 -2.618a1 1 0 0 0 -1.342 0.447 1 1 0 0 0 0.447 1.342l0.032 0.015 6.38 3.05a1 1 0 0 0 1.333 -0.471z"/>
  </svg>
  <svg x="1152">
-    <path d="M10 20.625v-7.071a1 1 0 1 0 -2 0v6.071h-6.071a1 1 0 0 0 -1.018 0.982 1 1 0 0 0 0.983 1.018h7.106a1 1 0 0 0 1 -1zm4.242 4.243v-7.071a1 1 0 1 0 -2 0v6.07h-6.07a1 1 0 0 0 -1.018 0.983 1 1 0 0 0 0.982 1.017h7.106a1 1 0 0 0 1 -1z"/>
+    <path d="M9.973 18.23l1.628 -6.88a1 1 0 1 0 -1.946 -0.46l-1.398 5.907 -5.908 -1.398a1 1 0 0 0 -1.216 0.721 1 1 0 0 0 0.721 1.216l0.035 0.009 6.88 1.628a1 1 0 0 0 1.204 -0.743zm3.152 5.106l1.628 -6.881a1 1 0 1 0 -1.946 -0.46l-1.398 5.907 -5.908 -1.398a1 1 0 0 0 -1.217 0.722 1 1 0 0 0 0.722 1.216c0.011 0.004 0.023 0.006 0.034 0.008l6.881 1.629a1 1 0 0 0 1.204 -0.743z"/>
  </svg>
  <svg x="1170">
-    <path d="M9.973 19.618l-1.628 -6.88a1 1 0 1 0 -1.946 0.46l1.398 5.908 -5.908 1.398a1 1 0 0 0 -0.764 1.19 1 1 0 0 0 1.19 0.764l0.034 -0.008 6.881 -1.629a1 1 0 0 0 0.743 -1.203zm5.106 3.152l-1.629 -6.881a1 1 0 1 0 -1.946 0.46l1.398 5.908 -5.908 1.398a1 1 0 0 0 -0.764 1.19 1 1 0 0 0 1.19 0.764l0.035 -0.008 6.88 -1.628a1 1 0 0 0 0.744 -1.203z"/>
+    <path d="M10 18v-7.071a1 1 0 1 0 -2 0v6.071h-6.071a1 1 0 0 0 -1.018 0.982 1 1 0 0 0 0.983 1.018h7.106a1 1 0 0 0 1 -1zm4.242 4.243v-7.071a1 1 0 1 0 -2 0v6.07h-6.07a1 1 0 0 0 -1.018 0.983 1 1 0 0 0 0.982 1.017h7.106a1 1 0 0 0 1 -1z"/>
  </svg>
  <svg x="1188">
-    <path d="M9.902 18.703l-3.05 -6.38a1 1 0 1 0 -1.804 0.862l2.619 5.479 -5.478 2.618a1 1 0 0 0 -0.494 1.325 1 1 0 0 0 1.325 0.495l0.032 -0.016 6.38 -3.05a1 1 0 0 0 0.47 -1.333zm5.658 1.998l-3.05 -6.38a1 1 0 1 0 -1.804 0.862l2.618 5.479 -5.477 2.618a1 1 0 0 0 -0.495 1.325 1 1 0 0 0 1.325 0.495l0.032 -0.016 6.38 -3.05a1 1 0 0 0 0.47 -1.333z"/>
+    <path d="M9.973 17.77l-1.628 -6.881a1 1 0 1 0 -1.946 0.46l1.398 5.908 -5.908 1.398a1 1 0 0 0 -0.764 1.19 1 1 0 0 0 1.19 0.764l0.034 -0.008 6.881 -1.628a1 1 0 0 0 0.743 -1.203zm5.106 3.151l-1.629 -6.88a1 1 0 1 0 -1.946 0.46l1.398 5.908 -5.908 1.398a1 1 0 0 0 -0.764 1.19 1 1 0 0 0 1.19 0.764l0.035 -0.008 6.88 -1.628a1 1 0 0 0 0.744 -1.204z"/>
  </svg>
  <svg x="1206">
-    <path d="M9.813 17.964l-4.12 -5.747a1 1 0 1 0 -1.625 1.165l3.537 4.934 -4.935 3.537a1 1 0 0 0 -0.255 1.391 1 1 0 0 0 1.392 0.255l0.028 -0.02 5.747 -4.12a1 1 0 0 0 0.23 -1.395zm5.92 0.977l-4.12 -5.748a1 1 0 1 0 -1.625 1.165l3.537 4.935 -4.935 3.537a1 1 0 0 0 -0.255 1.391 1 1 0 0 0 1.392 0.255l0.028 -0.02 5.747 -4.12a1 1 0 0 0 0.23 -1.395z"/>
+    <path d="M9.902 17.569l-3.05 -6.38a1 1 0 1 0 -1.804 0.862l2.619 5.478 -5.478 2.619a1 1 0 0 0 -0.494 1.325 1 1 0 0 0 1.325 0.494l0.032 -0.015 6.38 -3.05a1 1 0 0 0 0.47 -1.333zm5.658 1.998l-3.05 -6.38a1 1 0 1 0 -1.804 0.862l2.618 5.478 -5.477 2.619a1 1 0 0 0 -0.495 1.325 1 1 0 0 0 1.325 0.494l0.032 -0.015 6.38 -3.05a1 1 0 0 0 0.47 -1.333z"/>
  </svg>
  <svg x="1224">
-    <path d="M9.737 17.472l-4.775 -5.215a1 1 0 1 0 -1.475 1.35l4.1 4.478 -4.477 4.1a1 1 0 0 0 -0.088 1.411 1 1 0 0 0 1.412 0.088l0.026 -0.024 5.215 -4.775a1 1 0 0 0 0.062 -1.413zm5.995 0.264l-4.775 -5.215a1 1 0 1 0 -1.475 1.35l4.1 4.478 -4.478 4.1a1 1 0 0 0 -0.088 1.411 1 1 0 0 0 1.412 0.088l0.026 -0.024 5.215 -4.775a1 1 0 0 0 0.063 -1.413z"/>
+    <path d="M9.813 17.418l-4.12 -5.748a1 1 0 1 0 -1.625 1.165l3.537 4.935 -4.935 3.537a1 1 0 0 0 -0.255 1.39 1 1 0 0 0 1.392 0.256l0.028 -0.02 5.747 -4.12a1 1 0 0 0 0.23 -1.395zm5.92 0.976l-4.12 -5.747a1 1 0 1 0 -1.625 1.165l3.537 4.935 -4.935 3.536a1 1 0 0 0 -0.255 1.392 1 1 0 0 0 1.392 0.254l0.028 -0.02 5.747 -4.12a1 1 0 0 0 0.23 -1.395z"/>
  </svg>
  <svg x="1242">
-    <path d="M9.707 17.293l-5 -5a1 1 0 1 0 -1.414 1.414l4.293 4.293 -4.293 4.293a1 1 0 0 0 -0.025 1.414 1 1 0 0 0 1.414 0.025l0.025 -0.025 5 -5a1 1 0 0 0 0 -1.414zm6 0l-5 -5a1 1 0 1 0 -1.414 1.414l4.293 4.293 -4.293 4.293a1 1 0 0 0 -0.025 1.414 1 1 0 0 0 1.414 0.025l0.025 -0.025 5 -5a1 1 0 0 0 0 -1.414z"/>
+    <path d="M9.737 17.325l-4.775 -5.215a1 1 0 1 0 -1.475 1.35l4.1 4.478 -4.477 4.1a1 1 0 0 0 -0.088 1.411 1 1 0 0 0 1.412 0.087c0.01 -0.007 0.018 -0.016 0.026 -0.024l5.215 -4.775a1 1 0 0 0 0.062 -1.412zm5.995 0.264l-4.775 -5.215a1 1 0 1 0 -1.475 1.35l4.1 4.478 -4.478 4.1a1 1 0 0 0 -0.088 1.411 1 1 0 0 0 1.412 0.087c0.01 -0.007 0.018 -0.016 0.026 -0.023l5.215 -4.775a1 1 0 0 0 0.063 -1.413z"/>
  </svg>
  <svg x="1260">
    <path d="M9.707 17.293l-5 -5a1 1 0 1 0 -1.414 1.414l4.293 4.293 -4.293 4.293a1 1 0 0 0 -0.025 1.414 1 1 0 0 0 1.414 0.025l0.025 -0.025 5 -5a1 1 0 0 0 0 -1.414zm6 0l-5 -5a1 1 0 1 0 -1.414 1.414l4.293 4.293 -4.293 4.293a1 1 0 0 0 -0.025 1.414 1 1 0 0 0 1.414 0.025l0.025 -0.025 5 -5a1 1 0 0 0 0 -1.414z"/>
  </svg>
+  <svg x="1278">
+    <path d="M9.707 17.293l-5 -5a1 1 0 1 0 -1.414 1.414l4.293 4.293 -4.293 4.293a1 1 0 0 0 -0.025 1.414 1 1 0 0 0 1.414 0.025l0.025 -0.025 5 -5a1 1 0 0 0 0 -1.414zm6 0l-5 -5a1 1 0 1 0 -1.414 1.414l4.293 4.293 -4.293 4.293a1 1 0 0 0 -0.025 1.414 1 1 0 0 0 1.414 0.025l0.025 -0.025 5 -5a1 1 0 0 0 0 -1.414z"/>
+  </svg>
 </svg>
--- a/browser/themes/shared/incontentprefs/preferences.inc.css
+++ b/browser/themes/shared/incontentprefs/preferences.inc.css
@ -115,25 +115,12 @@ caption > label {

 #categories {
  max-height: 100vh;
-  background-color: #fafafc;
 }

 #categories > scrollbox {
  overflow-x: hidden !important;
 }

-.category-name {
-  font-size: 1.45rem;
-}
-
-.category,
-.category:hover,
-.category[selected] {
-  background-color: transparent;
-  border-inline-start: initial;
-  padding-inline-start: 44px;
-}
-
 /**
 * We want the last category to always have non-0 getBoundingClientRect().bottom
 * so we can use the value to figure out the max-height of the list in
--- a/browser/themes/shared/tabs.inc.css
+++ b/browser/themes/shared/tabs.inc.css
@ -6,12 +6,10 @@

 :root {
  --tab-toolbar-navbar-overlap: 1px;
-/* Temporarily using the compact tab strip by default because of bug 1386964:
  --tab-min-height: 33px;
 }

 :root[uidensity=compact] {
-*/
  --tab-min-height: 29px;
 }

@ -312,6 +310,10 @@
  background-repeat: repeat-x;
 }

+:root:not([sizemode=normal]) .tabbrowser-tab[first-visible-tab] > .tab-stack > .tab-background[selected=true] {
+  border-inline-start-style: none;
+}
+
 .tab-line[selected=true] {
  background-color: Highlight;
 }
@ -439,9 +441,6 @@
 #TabsToolbar > #new-tab-button ,
 #TabsToolbar > toolbarpaletteitem > #new-tab-button {
  list-style-image: url(chrome://browser/skin/tabbrowser/newtab.svg);
-  -moz-context-properties: fill;
-  fill: currentColor;
-  color: inherit;
 }

 .tabs-newtab-button {
@ -462,8 +461,6 @@

 #alltabs-button {
  list-style-image: url(chrome://browser/skin/arrow-dropdown-16.svg);
-  -moz-context-properties: fill;
-  fill: currentColor;
 }

 .alltabs-item > .menu-iconic-left > .menu-iconic-icon {
--- a/browser/themes/shared/toolbarbutton-icons.inc.css
+++ b/browser/themes/shared/toolbarbutton-icons.inc.css
@ -300,6 +300,7 @@ toolbar:not([brighttext]) #bookmarks-menu-button[starred] > .toolbarbutton-menub
  list-style-image: url("chrome://browser/skin/zoom-in.svg");
 }

+#PlacesChevron,
 #nav-bar-overflow-button {
  list-style-image: url("chrome://browser/skin/chevron.svg");
 }
@ -316,7 +317,7 @@ toolbar:not([brighttext]) #bookmarks-menu-button[starred] > .toolbarbutton-menub
    fill: #30A3FF;
  }
  to {
-    transform: translateX(-1242px);
+    transform: translateX(-1260px);
    fill: #30A3FF;
  }
 }
@ -329,7 +330,7 @@ toolbar:not([brighttext]) #bookmarks-menu-button[starred] > .toolbarbutton-menub
    fill: #30A3FF;
  }
  to {
-    transform: scaleX(-1) translateX(-1242px);
+    transform: scaleX(-1) translateX(-1260px);
    fill: #30A3FF;
  }
 }
@ -370,10 +371,10 @@ toolbar:not([brighttext]) #bookmarks-menu-button[starred] > .toolbarbutton-menub

 #nav-bar-overflow-button[animate] > .toolbarbutton-animatable-box > .toolbarbutton-animatable-image {
  animation-name: overflow-animation;
-  animation-timing-function: steps(69);
-  animation-duration: 1150ms;
+  animation-timing-function: steps(70);
+  animation-duration: 1167ms;
  background-image: url("chrome://browser/skin/chevron-animation.svg");
-  width: 1260px;
+  width: 1278px;
 }

 #nav-bar-overflow-button[animate]:-moz-locale-dir(rtl) > .toolbarbutton-animatable-box > .toolbarbutton-animatable-image {
--- a/browser/themes/shared/toolbarbuttons.inc.css
+++ b/browser/themes/shared/toolbarbuttons.inc.css
@ -11,8 +11,8 @@
  --backbutton-background: hsla(0,100%,100%,.8);
  --backbutton-hover-background: var(--backbutton-background);
  --backbutton-active-background: var(--toolbarbutton-active-background);
-
  --backbutton-border-color: hsla(240,5%,5%,.3);
+
  /* This default value of --toolbarbutton-height is defined to prevent
     CSS errors for an invalid variable. The value should not get used,
     as a more specific value should be set when the value will be used. */
@ -49,8 +49,8 @@ toolbar[brighttext] {
  margin-inline-end: 0;
 }

-:-moz-any(toolbar, .widget-overflow-list) .toolbarbutton-1 > .toolbarbutton-icon,
-:-moz-any(toolbar, .widget-overflow-list) .toolbarbutton-1 > .toolbarbutton-badge-stack > .toolbarbutton-icon {
+.toolbarbutton-1 > .toolbarbutton-icon,
+.toolbarbutton-1 > .toolbarbutton-badge-stack > .toolbarbutton-icon {
  max-width: 16px;
 }

@ -60,7 +60,6 @@ toolbar[brighttext] {
  margin: 0 0 var(--tab-toolbar-navbar-overlap);
 }

-#TabsToolbar .toolbarbutton-1,
 .tabbrowser-arrowscrollbox > .scrollbutton-up,
 .tabbrowser-arrowscrollbox > .scrollbutton-down {
  -moz-appearance: none;
@ -89,49 +88,48 @@ toolbar[brighttext] {
  padding: 0;
 }

-#nav-bar .toolbarbutton-1 {
+toolbar .toolbarbutton-1 {
  -moz-appearance: none;
  margin: 0;
  padding: 0 2px;
  -moz-box-pack: center;
 }

-#nav-bar #PanelUI-menu-button {
+#PanelUI-menu-button {
  padding-inline-start: 5px;
  padding-inline-end: 5px;
 }

-#nav-bar .toolbarbutton-1 > menupopup {
+toolbar .toolbarbutton-1 > menupopup {
  margin-top: -3px;
 }

-#nav-bar .toolbarbutton-1 > menupopup.cui-widget-panel {
+toolbar .toolbarbutton-1 > menupopup.cui-widget-panel {
  margin-top: -8px;
 }

 .findbar-button > .toolbarbutton-text,
 toolbarbutton.bookmark-item:not(.subviewbutton),
-#nav-bar .toolbarbutton-1 > .toolbarbutton-icon,
-#nav-bar .toolbarbutton-1 > .toolbarbutton-text,
-#nav-bar .toolbarbutton-1 > .toolbarbutton-badge-stack {
+toolbar .toolbarbutton-1 > .toolbarbutton-icon,
+toolbar .toolbarbutton-1 > .toolbarbutton-text,
+toolbar .toolbarbutton-1 > .toolbarbutton-badge-stack {
  padding: var(--toolbarbutton-inner-padding);
  border-radius: var(--toolbarbutton-border-radius);
  transition-property: background-color, border-color, box-shadow;
  transition-duration: 150ms;
 }

-#nav-bar .toolbarbutton-1 > .toolbarbutton-icon {
+toolbar .toolbarbutton-1 > .toolbarbutton-icon {
  /* horizontal padding + actual icon width */
  max-width: calc(2 * var(--toolbarbutton-inner-padding) + 16px);
 }

 .bookmark-item > .toolbarbutton-menu-dropmarker,
-#TabsToolbar .toolbarbutton-1 > .toolbarbutton-menu-dropmarker,
-#nav-bar .toolbarbutton-1 > .toolbarbutton-menu-dropmarker {
+toolbar .toolbarbutton-1 > .toolbarbutton-menu-dropmarker {
  display: none;
 }

-#nav-bar .toolbarbutton-1 > .toolbarbutton-text {
+toolbar .toolbarbutton-1 > .toolbarbutton-text {
  padding-top: var(--toolbarbutton-vertical-text-padding);
  padding-bottom: 0;
  /* To make the hover feedback line up with sibling buttons, it needs the same
@ -141,17 +139,17 @@ toolbarbutton.bookmark-item:not(.subviewbutton),
  min-height: calc(16px + 2 * var(--toolbarbutton-inner-padding));
 }

-#nav-bar .toolbaritem-combined-buttons {
+toolbar .toolbaritem-combined-buttons {
  margin-left: 2px;
  margin-right: 2px;
 }

-#nav-bar .toolbaritem-combined-buttons > .toolbarbutton-1 {
+toolbar .toolbaritem-combined-buttons > .toolbarbutton-1 {
  padding-left: 0;
  padding-right: 0;
 }

-#nav-bar .toolbaritem-combined-buttons:not(:hover) > separator {
+toolbar .toolbaritem-combined-buttons:not(:hover) > separator {
  content: "";
  display: -moz-box;
  width: 1px;
@ -164,19 +162,17 @@ toolbarbutton.bookmark-item:not(.subviewbutton),
  opacity: .2;
 }

-#nav-bar[brighttext] .toolbaritem-combined-buttons > separator {
+toolbar[brighttext] .toolbaritem-combined-buttons > separator {
  opacity: .3;
 }

-#TabsToolbar .toolbarbutton-1:not([disabled=true]):hover,
-#TabsToolbar .toolbarbutton-1[open],
 .tabbrowser-arrowscrollbox > .scrollbutton-up:not([disabled=true]):hover,
 .tabbrowser-arrowscrollbox > .scrollbutton-down:not([disabled=true]):hover,
 .findbar-button:not(:-moz-any([checked="true"],[disabled="true"])):hover > .toolbarbutton-text,
 toolbarbutton.bookmark-item:not(.subviewbutton):hover:not([disabled="true"]):not([open]),
-#nav-bar .toolbarbutton-1:not([disabled=true]):not([checked]):not([open]):not(:active):hover > .toolbarbutton-icon,
-#nav-bar .toolbarbutton-1:not([disabled=true]):not([checked]):not([open]):not(:active):hover > .toolbarbutton-text,
-#nav-bar .toolbarbutton-1:not([disabled=true]):not([checked]):not([open]):not(:active):hover > .toolbarbutton-badge-stack {
+toolbar .toolbarbutton-1:not([disabled=true]):not([checked]):not([open]):not(:active):hover > .toolbarbutton-icon,
+toolbar .toolbarbutton-1:not([disabled=true]):not([checked]):not([open]):not(:active):hover > .toolbarbutton-text,
+toolbar .toolbarbutton-1:not([disabled=true]):not([checked]):not([open]):not(:active):hover > .toolbarbutton-badge-stack {
  background-color: var(--toolbarbutton-hover-background);
  color: inherit;
 }
@ -184,15 +180,15 @@ toolbarbutton.bookmark-item:not(.subviewbutton):hover:not([disabled="true"]):not
 .findbar-button:not([disabled=true]):-moz-any([checked="true"],:hover:active) > .toolbarbutton-text,
 toolbarbutton.bookmark-item:not(.subviewbutton):hover:active:not([disabled="true"]),
 toolbarbutton.bookmark-item[open="true"],
-#nav-bar .toolbarbutton-1:not([disabled=true]):-moz-any([open],[checked],:hover:active) > .toolbarbutton-icon,
-#nav-bar .toolbarbutton-1:not([disabled=true]):-moz-any([open],[checked],:hover:active) > .toolbarbutton-text,
-#nav-bar .toolbarbutton-1:not([disabled=true]):-moz-any([open],[checked],:hover:active) > .toolbarbutton-badge-stack {
+toolbar .toolbarbutton-1:not([disabled=true]):-moz-any([open],[checked],:hover:active) > .toolbarbutton-icon,
+toolbar .toolbarbutton-1:not([disabled=true]):-moz-any([open],[checked],:hover:active) > .toolbarbutton-text,
+toolbar .toolbarbutton-1:not([disabled=true]):-moz-any([open],[checked],:hover:active) > .toolbarbutton-badge-stack {
  background-color: var(--toolbarbutton-active-background);
  transition-duration: 10ms;
  color: inherit;
 }

-#nav-bar .toolbarbutton-1[checked]:not(:active):hover > .toolbarbutton-icon {
+toolbar .toolbarbutton-1[checked]:not(:active):hover > .toolbarbutton-icon {
  background-color: var(--toolbarbutton-hover-background);
  transition: background-color .4s;
 }
--- a/browser/themes/windows/browser-aero.css
+++ b/browser/themes/windows/browser-aero.css
@ -2,6 +2,8 @@
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

+%filter substitution
+%define toolbarShadowColor hsla(209,67%,12%,0.35)
 %define glassActiveBorderColor rgb(37, 44, 51)
 %define glassInactiveBorderColor rgb(102, 102, 102)

--- a/browser/themes/windows/browser.css
+++ b/browser/themes/windows/browser.css
@ -8,9 +8,6 @@
@namespace html url("http://www.w3.org/1999/xhtml");
@namespace svg url("http://www.w3.org/2000/svg");

-%include ../shared/browser.inc
-%define toolbarShadowColor hsla(209,67%,12%,0.35)
-
 %include ../shared/browser.inc.css

 :root {
@ -1045,28 +1042,6 @@ treechildren.searchbar-treebody::-moz-tree-row(selected) {
  font-weight: bold;
 }

-
-toolbarbutton.chevron {
-  list-style-image: url("chrome://global/skin/toolbar/chevron.gif") !important;
-}
-
-toolbar[brighttext] toolbarbutton.chevron {
-  list-style-image: url("chrome://global/skin/toolbar/chevron-inverted.png") !important;
-}
-
-toolbarbutton.chevron:-moz-locale-dir(rtl) > .toolbarbutton-icon {
-  transform: scaleX(-1);
-}
-
-toolbarbutton.chevron > .toolbarbutton-text,
-toolbarbutton.chevron > .toolbarbutton-menu-dropmarker {
-  display: none;
-}
-
-toolbarbutton.chevron > .toolbarbutton-icon {
-  margin: 0;
-}
-
 /* Bookmarks toolbar */
 #PlacesToolbarDropIndicator {
  list-style-image: url(chrome://browser/skin/places/toolbarDropMarker.png);
--- a/build/moz.configure/toolchain.configure
+++ b/build/moz.configure/toolchain.configure
@ -1141,13 +1141,13 @@ option('--enable-gold',
       help='Enable GNU Gold Linker when it is not already the default',
       when=build_not_win_mac)

+imply_option('--enable-linker',
+             depends_if('--enable-gold', when=build_not_win_mac)(lambda x: 'gold'),
+             when=build_not_win_mac)

-@depends('--enable-gold', c_compiler, developer_options, check_build_environment, when=build_not_win_mac)
-@checking('for ld', lambda x: x.KIND)
@imports('os')
@imports('shutil')
-def enable_gold(enable_gold_option, c_compiler, developer_options, build_env):
-    linker = None
+def enable_gnu_linker(enable_gold_option, c_compiler, developer_options, build_env, linker_name):
    # Used to check the kind of linker
    version_check = ['-Wl,--version']
    cmd_base = c_compiler.wrapper + [c_compiler.compiler] + c_compiler.flags
@ -1182,7 +1182,7 @@ def enable_gold(enable_gold_option, c_compiler, developer_options, build_env):
            # The -B trick didn't work, removing the directory
            shutil.rmtree(targetDir)

-    if enable_gold_option or developer_options:
+    if (enable_gold_option or developer_options) and linker_name != 'bfd':
        result = resolve_gold()

        if result:
@ -1213,5 +1213,30 @@ def enable_gold(enable_gold_option, c_compiler, developer_options, build_env):
        KIND='other'
    )

-set_config('LD_IS_BFD', depends(enable_gold.KIND)(lambda x: x == 'bfd' or None))
-set_config('LINKER_LDFLAGS', enable_gold.LINKER_FLAG)
+js_option('--enable-linker', nargs=1,
+          choices=('bfd', 'gold', 'lld', 'other'),
+          help='Select the linker',
+          when=build_not_win_mac)
+
+@depends('--enable-linker', c_compiler, developer_options, check_build_environment, when=build_not_win_mac)
+@checking('for linker', lambda x: x.KIND)
+def select_linker(linker, c_compiler, developer_options, build_env):
+    linker = linker[0] if linker else 'other'
+    if linker in ('gold', 'bfd', 'other'):
+        return enable_gnu_linker(linker == 'gold', c_compiler, developer_options, build_env, linker)
+    if linker == 'lld':
+        version_check = ['-Wl,--version']
+        cmd_base = c_compiler.wrapper + [c_compiler.compiler] + c_compiler.flags
+        lld = "-fuse-ld=" + linker
+        cmd = cmd_base + [lld] + version_check
+        if 'LLD' in check_cmd_output(*cmd).decode('utf-8'):
+            return namespace(
+                KIND='lld',
+                LINKER_FLAG=lld,
+            )
+        else:
+            die("Could not use lld as linker")
+
+
+set_config('LD_IS_BFD', depends(select_linker.KIND)(lambda x: x == 'bfd' or None))
+set_config('LINKER_LDFLAGS', select_linker.LINKER_FLAG)
--- a/devtools/client/aboutdebugging/test/addons/test-devtools-webextension/bg.js
+++ b/devtools/client/aboutdebugging/test/addons/test-devtools-webextension/bg.js
@ -8,13 +8,16 @@

 document.body.innerText = "Background Page Body Test Content";

-// This function are called from the webconsole test:
-// browser_addons_debug_webextension.js
+// These functions are called from the following about:debugging tests:
+// - browser_addons_debug_webextension.js
+// - browser_addons_debug_webextension_popup.js

-function myWebExtensionAddonFunction() {  // eslint-disable-line no-unused-vars
+// eslint-disable-next-line no-unused-vars
+function myWebExtensionAddonFunction() {
  console.log("Background page function called", browser.runtime.getManifest());
 }

-function myWebExtensionShowPopup() {  // eslint-disable-line no-unused-vars
-  console.log("readyForOpenPopup");
+// eslint-disable-next-line no-unused-vars
+function myWebExtensionShowPopup() {
+  browser.test.sendMessage("readyForOpenPopup");
 }
--- a/devtools/client/aboutdebugging/test/addons/test-devtools-webextension/popup.js
+++ b/devtools/client/aboutdebugging/test/addons/test-devtools-webextension/popup.js
@ -6,8 +6,10 @@

 "use strict";

-// This function is called from the webconsole test:
+// This function is called from the following about:debugging test:
 // browser_addons_debug_webextension.js
-function myWebExtensionPopupAddonFunction() {  // eslint-disable-line no-unused-vars
-  console.log("Popup page function called", browser.runtime.getManifest());
+//
+// eslint-disable-next-line no-unused-vars
+function myWebExtensionPopupAddonFunction() {
+  browser.test.sendMessage("popupPageFunctionCalled", browser.runtime.getManifest());
 }
--- a/devtools/client/aboutdebugging/test/browser_addons_debug_webextension.js
+++ b/devtools/client/aboutdebugging/test/browser_addons_debug_webextension.js
@ -23,31 +23,39 @@ add_task(function* testWebExtensionsToolboxWebConsole() {
    tab, document, debugBtn,
  } = yield setupTestAboutDebuggingWebExtension(ADDON_NAME, ADDON_MANIFEST_PATH);

-  // Wait for a notification sent by a script evaluated the test addon via
-  // the web console.
-  let onCustomMessage = new Promise(done => {
-    Services.obs.addObserver(function listener(message, topic) {
-      let apiMessage = message.wrappedJSObject;
-      if (apiMessage.addonId != ADDON_ID) {
-        return;
-      }
-      Services.obs.removeObserver(listener, "console-api-log-event");
-      done(apiMessage.arguments);
-    }, "console-api-log-event");
-  });
-
  // Be careful, this JS function is going to be executed in the addon toolbox,
  // which lives in another process. So do not try to use any scope variable!
  let env = Cc["@mozilla.org/process/environment;1"]
              .getService(Ci.nsIEnvironment);
  let testScript = function () {
    /* eslint-disable no-undef */
+    function findMessages(hud, text, selector = ".message") {
+      const messages = hud.ui.outputNode.querySelectorAll(selector);
+      const elements = Array.prototype.filter.call(
+        messages,
+        (el) => el.textContent.includes(text)
+      );
+      return elements;
+    }
+
+    async function waitFor(condition) {
+      while (!condition()) {
+        await new Promise(done => window.setTimeout(done, 1000));
+      }
+    }
+
    toolbox.selectTool("webconsole")
-      .then(console => {
-        let { jsterm } = console.hud;
-        return jsterm.execute("myWebExtensionAddonFunction()");
+      .then(async console => {
+        let { hud } = console;
+        let { jsterm } = hud;
+        let onMessage = waitFor(() => {
+          return findMessages(hud, "Background page function called").length > 0;
+        });
+        await jsterm.execute("myWebExtensionAddonFunction()");
+        await onMessage;
+        await toolbox.destroy();
      })
-      .then(() => toolbox.destroy());
+      .catch(e => dump("Exception from browser toolbox process: " + e + "\n"));
    /* eslint-enable no-undef */
  };
  env.set("MOZ_TOOLBOX_TEST_SCRIPT", "new " + testScript);
@ -59,12 +67,6 @@ add_task(function* testWebExtensionsToolboxWebConsole() {

  debugBtn.click();

-  let args = yield onCustomMessage;
-  ok(true, "Received console message from the background page function as expected");
-  is(args[0], "Background page function called", "Got the expected console message");
-  is(args[1] && args[1].name, ADDON_NAME,
-     "Got the expected manifest from WebExtension API");
-
  yield onToolboxClose;
  ok(true, "Addon toolbox closed");

--- a/devtools/client/aboutdebugging/test/browser_addons_debug_webextension_popup.js
+++ b/devtools/client/aboutdebugging/test/browser_addons_debug_webextension_popup.js
@ -37,28 +37,48 @@ function makeWidgetId(id) {
 }

 add_task(function* testWebExtensionsToolboxSwitchToPopup() {
+  let onReadyForOpenPopup;
+  let onPopupCustomMessage;
+
+  Management.on("startup", function listener(event, extension) {
+    if (extension.name != ADDON_NAME) {
+      return;
+    }
+
+    Management.off("startup", listener);
+
+    function waitForExtensionTestMessage(expectedMessage) {
+      return new Promise(done => {
+        extension.on("test-message", function testLogListener(evt, ...args) {
+          const [message, ] = args;
+
+          if (message !== expectedMessage) {
+            return;
+          }
+
+          extension.off("test-message", testLogListener);
+          done(args);
+        });
+      });
+    }
+
+    // Wait for the test script running in the browser toolbox process
+    // to be ready for selecting the popup page in the frame list selector.
+    onReadyForOpenPopup = waitForExtensionTestMessage("readyForOpenPopup");
+
+    // Wait for a notification sent by a script evaluated the test addon via
+    // the web console.
+    onPopupCustomMessage = waitForExtensionTestMessage("popupPageFunctionCalled");
+  });
+
  let {
    tab, document, debugBtn,
  } = yield setupTestAboutDebuggingWebExtension(ADDON_NAME, ADDON_MANIFEST_PATH);

-  let onReadyForOpenPopup = new Promise(done => {
-    Services.obs.addObserver(function listener(message, topic) {
-      let apiMessage = message.wrappedJSObject;
-      if (apiMessage.addonId != ADDON_ID) {
-        return;
-      }
-
-      if (apiMessage.arguments[0] == "readyForOpenPopup") {
-        Services.obs.removeObserver(listener, "console-api-log-event");
-        done();
-      }
-    }, "console-api-log-event");
-  });
-
  // Be careful, this JS function is going to be executed in the addon toolbox,
  // which lives in another process. So do not try to use any scope variable!
-  let env = Cc["@mozilla.org/process/environment;1"]
-        .getService(Ci.nsIEnvironment);
+  let env = Cc["@mozilla.org/process/environment;1"].getService(Ci.nsIEnvironment);
+
  let testScript = function () {
    /* eslint-disable no-undef */

@ -66,7 +86,7 @@ add_task(function* testWebExtensionsToolboxSwitchToPopup() {
    let popupFramePromise;

    toolbox.selectTool("webconsole")
-      .then(console => {
+      .then(async (console) => {
        dump(`Clicking the noautohide button\n`);
        toolbox.doc.getElementById("command-button-noautohide").click();
        dump(`Clicked the noautohide button\n`);
@ -81,32 +101,25 @@ add_task(function* testWebExtensionsToolboxSwitchToPopup() {
          toolbox.target.on("frame-update", listener);
        });

-        let waitForFrameListUpdate = new Promise((done) => {
-          toolbox.target.once("frame-update", () => {
-            done(console);
-          });
-        });
+        let waitForFrameListUpdate = toolbox.target.once("frame-update");

        jsterm = console.hud.jsterm;
        jsterm.execute("myWebExtensionShowPopup()");

-        // Wait the initial frame update (which list the background page).
-        return waitForFrameListUpdate;
-      })
-      .then((console) => {
-        // Wait the new frame update (once the extension popup has been opened).
-        return popupFramePromise;
-      })
-      .then(() => {
+        await Promise.all([
+          // Wait the initial frame update (which list the background page).
+          waitForFrameListUpdate,
+          // Wait the new frame update (once the extension popup has been opened).
+          popupFramePromise,
+        ]);
+
        dump(`Clicking the frame list button\n`);
        let btn = toolbox.doc.getElementById("command-button-frames");
-        let menu = toolbox.showFramesMenu({target: btn});
+        let frameMenu = toolbox.showFramesMenu({target: btn});
        dump(`Clicked the frame list button\n`);
-        return menu.once("open").then(() => {
-          return menu;
-        });
-      })
-      .then(frameMenu => {
+
+        await frameMenu.once("open");
+
        let frames = frameMenu.items;

        if (frames.length != 2) {
@ -125,12 +138,12 @@ add_task(function* testWebExtensionsToolboxSwitchToPopup() {

        popupFrameBtn.click();

-        return waitForNavigated;
+        await waitForNavigated;
+
+        await jsterm.execute("myWebExtensionPopupAddonFunction()");
+
+        await toolbox.destroy();
      })
-      .then(() => {
-        return jsterm.execute("myWebExtensionPopupAddonFunction()");
-      })
-      .then(() => toolbox.destroy())
      .catch((error) => {
        dump("Error while running code in the browser toolbox process:\n");
        dump(error + "\n");
@ -143,22 +156,6 @@ add_task(function* testWebExtensionsToolboxSwitchToPopup() {
    env.set("MOZ_TOOLBOX_TEST_SCRIPT", "");
  });

-  // Wait for a notification sent by a script evaluated the test addon via
-  // the web console.
-  let onPopupCustomMessage = new Promise(done => {
-    Services.obs.addObserver(function listener(message, topic) {
-      let apiMessage = message.wrappedJSObject;
-      if (apiMessage.addonId != ADDON_ID) {
-        return;
-      }
-
-      if (apiMessage.arguments[0] == "Popup page function called") {
-        Services.obs.removeObserver(listener, "console-api-log-event");
-        done(apiMessage.arguments);
-      }
-    }, "console-api-log-event");
-  });
-
  let onToolboxClose = BrowserToolboxProcess.once("close");

  debugBtn.click();
@ -174,7 +171,7 @@ add_task(function* testWebExtensionsToolboxSwitchToPopup() {

  let args = yield onPopupCustomMessage;
  ok(true, "Received console message from the popup page function as expected");
-  is(args[0], "Popup page function called", "Got the expected console message");
+  is(args[0], "popupPageFunctionCalled", "Got the expected console message");
  is(args[1] && args[1].name, ADDON_NAME,
     "Got the expected manifest from WebExtension API");

--- a/devtools/client/shared/developer-toolbar.js
+++ b/devtools/client/shared/developer-toolbar.js
@ -25,7 +25,7 @@ loader.lazyGetter(this, "prefBranch", function () {

 loader.lazyRequireGetter(this, "gcliInit", "devtools/shared/gcli/commands/index");
 loader.lazyRequireGetter(this, "util", "gcli/util/util");
-loader.lazyRequireGetter(this, "ConsoleServiceListener", "devtools/server/actors/utils/webconsole-listeners", true);
+loader.lazyRequireGetter(this, "ConsoleServiceListener", "devtools/server/actors/webconsole/listeners", true);
 loader.lazyRequireGetter(this, "gDevTools", "devtools/client/framework/devtools", true);
 loader.lazyRequireGetter(this, "gDevToolsBrowser", "devtools/client/framework/devtools-browser", true);
 loader.lazyRequireGetter(this, "nodeConstants", "devtools/shared/dom-node-constants");
--- a/devtools/client/themes/images/debugging-addons.svg
+++ b/devtools/client/themes/images/debugging-addons.svg
@ -1,6 +1,6 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
   - License, v. 2.0. If a copy of the MPL was not distributed with this
   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<svg height="16" width="16" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 18 18" fill="#fbfbfb">
-  <path d="M12,17c0.5,0,1-0.5,1-1v-4c0,0,0.2-0.8,0.8-0.8c0.6,0,0.6,0.8,1.8,0.8 c0.6,0,1.5-0.2,1.5-2c0-1.8-0.9-2-1.5-2c-1.1,0-1.2,0.8-1.8,0.8C13.2,8.8,13,8,13,8V6c0-0.6-0.4-1-1-1H9c0,0-0.8-0.1-0.8-0.8 S9,3.6,9,2.5C9,1.9,8.8,1,7,1S5,1.9,5,2.5c0,1.1,0.8,1.2,0.8,1.8S5,5,5,5H2C1.4,5,1,5.4,1,6l0,2.5c0,0-0.1,1.5,1.1,1.5 c0.8,0,0.9-1,1.9-1c0.5,0,1,0.5,1,1.6c0,1-0.5,1.6-1,1.6c-1,0-1.1-1-1.9-1C0.9,11,1,12.5,1,12.5L1,16c0,0.6,0.4,1,1,1h3.9 c0,0,1.5,0.1,1.5-1.1c0-0.8-1-0.9-1-1.9c0-0.5,0.7-1.2,1.8-1.2s1.9,0.7,1.9,1.2c0,1-1,1.1-1,1.9c0,1.2,1.5,1.1,1.5,1.1H12z" />
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 16">
+  <path fill="context-fill" d="M14.5 8c-.971 0-1 1-1.75 1a.765.765 0 0 1-.75-.75V5a1 1 0 0 0-1-1H7.75A.765.765 0 0 1 7 3.25c0-.75 1-.779 1-1.75C8 .635 7.1 0 6 0S4 .635 4 1.5c0 .971 1 1 1 1.75a.765.765 0 0 1-.75.75H1a1 1 0 0 0-1 1v2.25A.765.765 0 0 0 .75 8c.75 0 .779-1 1.75-1C3.365 7 4 7.9 4 9s-.635 2-1.5 2c-.971 0-1-1-1.75-1a.765.765 0 0 0-.75.75V15a1 1 0 0 0 1 1h3.25a.765.765 0 0 0 .75-.75c0-.75-1-.779-1-1.75 0-.865.9-1.5 2-1.5s2 .635 2 1.5c0 .971-1 1-1 1.75a.765.765 0 0 0 .75.75H11a1 1 0 0 0 1-1v-3.25a.765.765 0 0 1 .75-.75c.75 0 .779 1 1.75 1 .865 0 1.5-.9 1.5-2s-.635-2-1.5-2z"></path>
 </svg>
--- a/devtools/client/themes/images/debugging-tabs.svg
+++ b/devtools/client/themes/images/debugging-tabs.svg
@ -1,3 +1,6 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 18 18">
-  <path d="M17,12v2a1,1,0,0,1-1,1H2a1,1,0,0,1-1-1V12a1,1,0,0,1,1-1H1.142c2.3,0,2.536-1.773,2.874-4,0.351-2.316.083-4,3.13-4h3.707C13.917,3,13.647,4.684,14,7c0.34,2.228.582,4,2.89,4H16A1,1,0,0,1,17,12Z" fill="white"/>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16">
+  <path fill="context-fill" d="M15 11h-1V5a2 2 0 0 0-2-2H4a2 2 0 0 0-2 2v6H1a1 1 0 0 0 0 2h14a1 1 0 1 0 0-2z"></path>
 </svg>
--- a/devtools/client/themes/images/debugging-workers.svg
+++ b/devtools/client/themes/images/debugging-workers.svg
@ -1,7 +1,7 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
   - License, v. 2.0. If a copy of the MPL was not distributed with this
   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<svg height="16" width="16" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" fill="#fbfbfb">
+<svg height="16" width="16" xmlns="http://www.w3.org/2000/svg" fill="context-fill">
 <path d="M14.6,6.1L13.5,5l0,0c0.1-0.1,0.2-0.4,0.2-0.6c0-0.2-0.1-0.4-0.2-0.6l-0.4-0.4c-0.3-0.3-0.8-0.3-1.1,0l0,0
 	L10.5,2c-0.2-0.2-0.3-0.2-0.5-0.2c-0.2,0-0.3,0.1-0.5,0.2L8.3,3.2C8.1,3.3,8.1,3.4,8.1,3.6S8.2,4,8.3,4.1l1.6,1.6L7.8,7.8L5.6,5.7
 	l1.5-1.5C7.3,4,7.4,3.8,7.4,3.6c0-0.2-0.1-0.4-0.2-0.6l-1-1C5.8,1.7,5.3,1.7,5,2L0.9,6.1C0.7,6.3,0.6,6.5,0.6,6.7
--- a/devtools/client/webconsole/hudservice.js
+++ b/devtools/client/webconsole/hudservice.js
@ -190,9 +190,8 @@ HUD_SERVICE.prototype =
      return client.connect()
        .then(() => client.getProcess())
        .then(aResponse => {
-          // Set chrome:false in order to attach to the target
-          // (i.e. send an `attach` request to the chrome actor)
-          return { form: aResponse.form, client: client, chrome: false };
+          // Use a TabActor in order to ensure calling `attach` to the ChromeActor
+          return { form: aResponse.form, client, chrome: true, isTabActor: true };
        });
    }

--- a/devtools/client/webconsole/webconsole-connection-proxy.js
+++ b/devtools/client/webconsole/webconsole-connection-proxy.js
@ -178,6 +178,11 @@ WebConsoleConnectionProxy.prototype = {
  _attachConsole: function () {
    let listeners = ["PageError", "ConsoleAPI", "NetworkActivity",
                     "FileActivity"];
+    // Enable the forwarding of console messages to the parent process
+    // when we open the Browser Console or Toolbox.
+    if (this.target.chrome && !this.target.isAddon) {
+      listeners.push("ContentProcessMessages");
+    }
    this.client.attachConsole(this._consoleActor, listeners,
                              this._onAttachConsole);
  },
--- a/devtools/server/actors/addon.js
+++ b/devtools/server/actors/addon.js
@ -9,7 +9,7 @@ var Services = require("Services");
 var { ActorPool } = require("devtools/server/actors/common");
 var { TabSources } = require("./utils/TabSources");
 var makeDebugger = require("./utils/make-debugger");
-var { ConsoleAPIListener } = require("devtools/server/actors/utils/webconsole-listeners");
+var { ConsoleAPIListener } = require("devtools/server/actors/webconsole/listeners");
 var DevToolsUtils = require("devtools/shared/DevToolsUtils");
 var { assert, update } = DevToolsUtils;

--- a/devtools/server/actors/moz.build
+++ b/devtools/server/actors/moz.build
@ -7,6 +7,7 @@
 DIRS += [
    'highlighters',
    'utils',
+    'webconsole',
 ]

 DevToolsModules(
--- a/devtools/server/actors/utils/moz.build
+++ b/devtools/server/actors/utils/moz.build
@ -15,7 +15,4 @@ DevToolsModules(
    'stack.js',
    'TabSources.js',
    'walker-search.js',
-    'webconsole-listeners.js',
-    'webconsole-utils.js',
-    'webconsole-worker-listeners.js',
 )
--- a/devtools/server/actors/webconsole.js
+++ b/devtools/server/actors/webconsole.js
@ -25,20 +25,21 @@ loader.lazyRequireGetter(this, "ServerLoggingListener", "devtools/shared/webcons
 loader.lazyRequireGetter(this, "JSPropertyProvider", "devtools/shared/webconsole/js-property-provider", true);
 loader.lazyRequireGetter(this, "Parser", "resource://devtools/shared/Parser.jsm", true);
 loader.lazyRequireGetter(this, "NetUtil", "resource://gre/modules/NetUtil.jsm", true);
-loader.lazyRequireGetter(this, "addWebConsoleCommands", "devtools/server/actors/utils/webconsole-utils", true);
-loader.lazyRequireGetter(this, "CONSOLE_WORKER_IDS", "devtools/server/actors/utils/webconsole-utils", true);
-loader.lazyRequireGetter(this, "WebConsoleUtils", "devtools/server/actors/utils/webconsole-utils", true);
+loader.lazyRequireGetter(this, "addWebConsoleCommands", "devtools/server/actors/webconsole/utils", true);
+loader.lazyRequireGetter(this, "CONSOLE_WORKER_IDS", "devtools/server/actors/webconsole/utils", true);
+loader.lazyRequireGetter(this, "WebConsoleUtils", "devtools/server/actors/webconsole/utils", true);
 loader.lazyRequireGetter(this, "EnvironmentActor", "devtools/server/actors/environment", true);

 // Overwrite implemented listeners for workers so that we don't attempt
 // to load an unsupported module.
 if (isWorker) {
-  loader.lazyRequireGetter(this, "ConsoleAPIListener", "devtools/server/actors/utils/webconsole-worker-listeners", true);
-  loader.lazyRequireGetter(this, "ConsoleServiceListener", "devtools/server/actors/utils/webconsole-worker-listeners", true);
+  loader.lazyRequireGetter(this, "ConsoleAPIListener", "devtools/server/actors/webconsole/worker-listeners", true);
+  loader.lazyRequireGetter(this, "ConsoleServiceListener", "devtools/server/actors/webconsole/worker-listeners", true);
 } else {
-  loader.lazyRequireGetter(this, "ConsoleAPIListener", "devtools/server/actors/utils/webconsole-listeners", true);
-  loader.lazyRequireGetter(this, "ConsoleServiceListener", "devtools/server/actors/utils/webconsole-listeners", true);
-  loader.lazyRequireGetter(this, "ConsoleReflowListener", "devtools/server/actors/utils/webconsole-listeners", true);
+  loader.lazyRequireGetter(this, "ConsoleAPIListener", "devtools/server/actors/webconsole/listeners", true);
+  loader.lazyRequireGetter(this, "ConsoleServiceListener", "devtools/server/actors/webconsole/listeners", true);
+  loader.lazyRequireGetter(this, "ConsoleReflowListener", "devtools/server/actors/webconsole/listeners", true);
+  loader.lazyRequireGetter(this, "ContentProcessListener", "devtools/server/actors/webconsole/listeners", true);
 }

 /**
@ -368,6 +369,10 @@ WebConsoleActor.prototype =
      this.serverLoggingListener.destroy();
      this.serverLoggingListener = null;
    }
+    if (this.contentProcessListener) {
+      this.contentProcessListener.destroy();
+      this.contentProcessListener = null;
+    }

    events.off(this.parentActor, "changed-toplevel-document",
               this._onChangedToplevelDocument);
@ -664,6 +669,16 @@ WebConsoleActor.prototype =
          }
          startedListeners.push(listener);
          break;
+        case "ContentProcessMessages":
+          // Workers don't support this message type
+          if (isWorker) {
+            break;
+          }
+          if (!this.contentProcessListener) {
+            this.contentProcessListener = new ContentProcessListener(this);
+          }
+          startedListeners.push(listener);
+          break;
      }
    }

@ -693,7 +708,7 @@ WebConsoleActor.prototype =
    // listeners.
    let toDetach = request.listeners ||
      ["PageError", "ConsoleAPI", "NetworkActivity",
-       "FileActivity", "ServerLogging"];
+       "FileActivity", "ServerLogging", "ContentProcessMessages"];

    while (toDetach.length > 0) {
      let listener = toDetach.shift();
@ -749,6 +764,13 @@ WebConsoleActor.prototype =
          }
          stoppedListeners.push(listener);
          break;
+        case "ContentProcessMessages":
+          if (this.contentProcessListener) {
+            this.contentProcessListener.destroy();
+            this.contentProcessListener = null;
+          }
+          stoppedListeners.push(listener);
+          break;
      }
    }

--- a/devtools/server/actors/webconsole/content-process-forward.js
+++ b/devtools/server/actors/webconsole/content-process-forward.js
@ -0,0 +1,136 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const Cu = Components.utils;
+const Ci = Components.interfaces;
+
+const { Services } = Cu.import("resource://gre/modules/Services.jsm", {});
+const { XPCOMUtils } = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
+
+XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
+                                   "@mozilla.org/childprocessmessagemanager;1",
+                                   "nsIMessageSender");
+XPCOMUtils.defineLazyModuleGetter(this, "E10SUtils",
+                                  "resource:///modules/E10SUtils.jsm");
+
+/*
+ * The message manager has an upper limit on message sizes that it can
+ * reliably forward to the parent so we limit the size of console log event
+ * messages that we forward here. The web console is local and receives the
+ * full console message, but addons subscribed to console event messages
+ * in the parent receive the truncated version. Due to fragmentation,
+ * messages as small as 1MB have resulted in IPC allocation failures on
+ * 32-bit platforms. To limit IPC allocation sizes, console.log messages
+ * with arguments with total size > MSG_MGR_CONSOLE_MAX_SIZE (bytes) have
+ * their arguments completely truncated. MSG_MGR_CONSOLE_VAR_SIZE is an
+ * approximation of how much space (in bytes) a JS non-string variable will
+ * require in the manager's implementation. For strings, we use 2 bytes per
+ * char. The console message URI and function name are limited to
+ * MSG_MGR_CONSOLE_INFO_MAX characters. We don't attempt to calculate
+ * the exact amount of space the message manager implementation will require
+ * for a given message so this is imperfect.
+ */
+const MSG_MGR_CONSOLE_MAX_SIZE = 1024 * 1024; // 1MB
+const MSG_MGR_CONSOLE_VAR_SIZE = 8;
+const MSG_MGR_CONSOLE_INFO_MAX = 1024;
+
+function ContentProcessForward() {
+  Services.obs.addObserver(this, "console-api-log-event");
+  Services.obs.addObserver(this, "xpcom-shutdown");
+  cpmm.addMessageListener("DevTools:StopForwardingContentProcessMessage", this);
+}
+ContentProcessForward.prototype = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
+                                         Ci.nsISupportsWeakReference]),
+
+  receiveMessage(message) {
+    if (message.name == "DevTools:StopForwardingContentProcessMessage") {
+      this.uninit();
+    }
+  },
+
+  observe(subject, topic, data) {
+    switch (topic) {
+      case "console-api-log-event": {
+        let consoleMsg = subject.wrappedJSObject;
+
+        let msgData = {
+          level: consoleMsg.level,
+          filename: consoleMsg.filename.substring(0, MSG_MGR_CONSOLE_INFO_MAX),
+          lineNumber: consoleMsg.lineNumber,
+          functionName: consoleMsg.functionName &&
+            consoleMsg.functionName.substring(0, MSG_MGR_CONSOLE_INFO_MAX),
+          timeStamp: consoleMsg.timeStamp,
+          addonId: consoleMsg.addonId,
+          arguments: [],
+        };
+
+        // We can't send objects over the message manager, so we sanitize
+        // them out, replacing those arguments with "<unavailable>".
+        let unavailString = "<unavailable>";
+        let unavailStringLength = unavailString.length * 2; // 2-bytes per char
+
+        // When the sum of argument sizes reaches MSG_MGR_CONSOLE_MAX_SIZE,
+        // replace all arguments with "<truncated>".
+        let totalArgLength = 0;
+
+        // Walk through the arguments, checking the type and size.
+        for (let arg of consoleMsg.arguments) {
+          if ((typeof arg == "object" || typeof arg == "function") &&
+              arg !== null) {
+            if (Services.appinfo.remoteType === E10SUtils.EXTENSION_REMOTE_TYPE) {
+              // For OOP extensions: we want the developer to be able to see the
+              // logs in the Browser Console. When the Addon Toolbox will be more
+              // prominent we can revisit.
+              try {
+                // If the argument is clonable, then send it as-is. If
+                // cloning fails, fall back to the unavailable string.
+                arg = Cu.cloneInto(arg, {});
+              } catch (e) {
+                arg = unavailString;
+              }
+            } else {
+              arg = unavailString;
+            }
+            totalArgLength += unavailStringLength;
+          } else if (typeof arg == "string") {
+            totalArgLength += arg.length * 2; // 2-bytes per char
+          } else {
+            totalArgLength += MSG_MGR_CONSOLE_VAR_SIZE;
+          }
+
+          if (totalArgLength <= MSG_MGR_CONSOLE_MAX_SIZE) {
+            msgData.arguments.push(arg);
+          } else {
+            // arguments take up too much space
+            msgData.arguments = ["<truncated>"];
+            break;
+          }
+        }
+
+        cpmm.sendAsyncMessage("Console:Log", msgData);
+        break;
+      }
+
+      case "xpcom-shutdown":
+        this.uninit();
+        break;
+    }
+  },
+
+  uninit() {
+    Services.obs.removeObserver(this, "console-api-log-event");
+    Services.obs.removeObserver(this, "xpcom-shutdown");
+    cpmm.removeMessageListener("DevTools:StopForwardingContentProcessMessage", this);
+  }
+};
+
+// loadProcessScript loads in all processes, including the parent,
+// in which we don't need any forwarding
+if (Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT) {
+  new ContentProcessForward();
+}
+
--- a/devtools/server/actors/utils/webconsole-listeners.js
+++ b/devtools/server/actors/utils/webconsole-listeners.js
@ -8,13 +8,16 @@ const {Cc, Ci, components} = require("chrome");
 const {isWindowIncluded} = require("devtools/shared/layout/utils");
 const Services = require("Services");
 const {XPCOMUtils} = require("resource://gre/modules/XPCOMUtils.jsm");
-const {CONSOLE_WORKER_IDS, WebConsoleUtils} = require("devtools/server/actors/utils/webconsole-utils");
+const {CONSOLE_WORKER_IDS, WebConsoleUtils} = require("devtools/server/actors/webconsole/utils");

 XPCOMUtils.defineLazyServiceGetter(this,
                                   "swm",
                                   "@mozilla.org/serviceworkers/manager;1",
                                   "nsIServiceWorkerManager");

+// Process script used to forward console calls from content processes to parent process
+const CONTENT_PROCESS_SCRIPT = "resource://devtools/server/actors/webconsole/content-process-forward.js";
+
 // The page errors listener

 /**
@ -451,3 +454,39 @@ ConsoleReflowListener.prototype =
    this.listener = this.docshell = null;
  },
 };
+
+/**
+ * Forward console message calls from content processes to the parent process.
+ * Used by Browser console and toolbox to see messages from all processes.
+ *
+ * @constructor
+ * @param object owner
+ *        The listener owner which needs to implement:
+ *        - onConsoleAPICall(message)
+ */
+function ContentProcessListener(listener) {
+  this.listener = listener;
+
+  Services.ppmm.addMessageListener("Console:Log", this);
+  Services.ppmm.loadProcessScript(CONTENT_PROCESS_SCRIPT, true);
+}
+
+exports.ContentProcessListener = ContentProcessListener;
+
+ContentProcessListener.prototype = {
+  receiveMessage(message) {
+    let logMsg = message.data;
+    logMsg.wrappedJSObject = logMsg;
+    this.listener.onConsoleAPICall(logMsg);
+  },
+
+  destroy() {
+    // Tell the content processes to stop listening and forwarding messages
+    Services.ppmm.broadcastAsyncMessage("DevTools:StopForwardingContentProcessMessage");
+
+    Services.ppmm.removeMessageListener("Console:Log", this);
+    Services.ppmm.removeDelayedProcessScript(CONTENT_PROCESS_SCRIPT);
+
+    this.listener = null;
+  }
+};
--- a/devtools/server/actors/webconsole/moz.build
+++ b/devtools/server/actors/webconsole/moz.build
@ -0,0 +1,12 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+DevToolsModules(
+    'content-process-forward.js',
+    'listeners.js',
+    'utils.js',
+    'worker-listeners.js',
+)
--- a/devtools/server/actors/utils/webconsole-utils.js
+++ b/devtools/server/actors/utils/webconsole-utils.js
--- a/devtools/server/actors/utils/webconsole-worker-listeners.js
+++ b/devtools/server/actors/utils/webconsole-worker-listeners.js
--- a/devtools/server/tests/mochitest/chrome.ini
+++ b/devtools/server/tests/mochitest/chrome.ini
@ -34,6 +34,7 @@ support-files =
 [test_css-logic.html]
 [test_css-logic-media-queries.html]
 [test_css-logic-specificity.html]
+fail-if = stylo # bug 1387905
 [test_css-properties.html]
 [test_Debugger.Source.prototype.introductionScript.html]
 [test_Debugger.Source.prototype.introductionType.html]
--- a/devtools/shared/tests/unit/test_console_filtering.js
+++ b/devtools/shared/tests/unit/test_console_filtering.js
@ -4,7 +4,7 @@
 "use strict";

 const { console, ConsoleAPI } = require("resource://gre/modules/Console.jsm");
-const { ConsoleAPIListener } = require("devtools/server/actors/utils/webconsole-listeners");
+const { ConsoleAPIListener } = require("devtools/server/actors/webconsole/listeners");
 const Services = require("Services");

 var seenMessages = 0;
--- a/devtools/shared/webconsole/test/test_cached_messages.html
+++ b/devtools/shared/webconsole/test/test_cached_messages.html
@ -97,7 +97,7 @@ function doConsoleCalls() {
 <script class="testbody" type="text/javascript">
 SimpleTest.waitForExplicitFinish();
 var {ConsoleServiceListener, ConsoleAPIListener} =
-  require("devtools/server/actors/utils/webconsole-listeners");
+  require("devtools/server/actors/webconsole/listeners");

 let consoleAPIListener, consoleServiceListener;
 let consoleAPICalls = 0;
--- a/devtools/shared/webconsole/test/test_commands_registration.html
+++ b/devtools/shared/webconsole/test/test_commands_registration.html
@ -18,7 +18,7 @@ SimpleTest.waitForExplicitFinish();
 let gState;
 let tests;

-let {WebConsoleCommands} = require("devtools/server/actors/utils/webconsole-utils");
+let {WebConsoleCommands} = require("devtools/server/actors/webconsole/utils");

 function evaluateJS(input) {
  return new Promise((resolve) => gState.client.evaluateJS(input, resolve));
--- a/dom/base/Element.cpp
+++ b/dom/base/Element.cpp
@ -4123,8 +4123,11 @@ Element::UpdateIntersectionObservation(DOMIntersectionObserver* aObserver, int32

 void
 Element::ClearServoData() {
+  MOZ_ASSERT(IsStyledByServo());
 #ifdef MOZ_STYLO
  Servo_Element_ClearData(this);
+  UnsetFlags(ELEMENT_HAS_DIRTY_DESCENDANTS_FOR_SERVO |
+             ELEMENT_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO);
 #else
  MOZ_CRASH("Accessing servo node data in non-stylo build");
 #endif
--- a/dom/base/Selection.cpp
+++ b/dom/base/Selection.cpp
@ -605,14 +605,24 @@ Selection::GetTableCellLocationFromRange(nsRange* aRange,
  if (!content)
    return NS_ERROR_FAILURE;

-  nsIContent *child = content->GetChildAt(aRange->StartOffset());
+  nsCOMPtr<nsIContent> child = content->GetChildAt(aRange->StartOffset());
  if (!child)
    return NS_ERROR_FAILURE;

+  // GetCellLayout depends on current frame, we need flush frame to get
+  // nsITableCellLayout
+  nsCOMPtr<nsIPresShell> presShell = mFrameSelection->GetShell();
+  if (presShell) {
+    presShell->FlushPendingNotifications(FlushType::Frames);
+
+    // Since calling FlushPendingNotifications, so check whether disconnected.
+    if (!mFrameSelection || !mFrameSelection->GetShell()) {
+      return NS_ERROR_FAILURE;
+    }
+  }
+
  //Note: This is a non-ref-counted pointer to the frame
  nsITableCellLayout *cellLayout = mFrameSelection->GetCellLayout(child);
-  if (NS_FAILED(result))
-    return result;
  if (!cellLayout)
    return NS_ERROR_FAILURE;

@ -2276,6 +2286,9 @@ Selection::AddRangeInternal(nsRange& aRange, nsIDocument* aDocument,
    return;
  }

+  // AddTableCellRange might flush frame.
+  RefPtr<Selection> kungFuDeathGrip(this);
+
  // This inserts a table cell range in proper document order
  // and returns NS_OK if range doesn't contain just one table cell
  bool didAddRange;
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@ -13219,7 +13219,10 @@ nsIDocument::UpdateStyleBackendType()

 #ifdef MOZ_STYLO
  if (nsLayoutUtils::StyloEnabled()) {
-    if (!mDocumentContainer) {
+    if (IsBeingUsedAsImage()) {
+      // Enable stylo for SVG-as-image.
+      mStyleBackendType = StyleBackendType::Servo;
+    } else if (!mDocumentContainer) {
      NS_WARNING("stylo: No docshell yet, assuming Gecko style system");
    } else if ((IsHTMLOrXHTML() || IsSVGDocument()) &&
               IsContentDocument()) {
--- a/dom/base/test/mochitest.ini
+++ b/dom/base/test/mochitest.ini
@ -313,6 +313,7 @@ skip-if = toolkit == 'android'
 [test_bug338583.html]
 skip-if = toolkit == 'android'
 [test_bug338679.html]
+fail-if = stylo # bug 1370779
 [test_bug339494.html]
 [test_bug339494.xhtml]
 [test_bug340571.html]
@ -620,6 +621,7 @@ skip-if = toolkit == 'android'
 [test_bug1314032.html]
 [test_bug1318303.html]
 [test_bug1375050.html]
+[test_bug1381710.html]
 [test_bug1384658.html]
 skip-if = toolkit == 'android'
 [test_caretPositionFromPoint.html]
@ -680,6 +682,7 @@ skip-if = (toolkit == 'android') # Android: Bug 775227
 [test_innersize_scrollport.html]
 [test_integer_attr_with_leading_zero.html]
 [test_intersectionobservers.html]
+skip-if = stylo # timeout bug 1384001
 [test_link_prefetch.html]
 skip-if = !e10s # Track Bug 1281415
 [test_link_stylesheet.html]
@ -703,6 +706,7 @@ skip-if = (os != 'android')    # meta-viewport tag support is mobile-only
 [test_mozbrowser_apis_blocked.html]
 [test_mozMatchesSelector.html]
 [test_mutationobserver_anonymous.html]
+skip-if = stylo # bug 1383985
 [test_mutationobservers.html]
 [test_named_frames.html]
 [test_navigator_hardwareConcurrency.html]
--- a/dom/base/test/test_bug1381710.html
+++ b/dom/base/test/test_bug1381710.html
@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1381710
+-->
+<head>
+  <title>Test for Mozilla Bug 1381710</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1381710">Mozilla Bug 1381710</a>
+<div id="content">
+  <div id="nonedit"></div>
+  <div id="edit" contenteditable=true></div>
+</div>
+<pre id="test">
+<script type="application/javascript">
+function test(element)
+{
+  let selection = window.getSelection();
+  selection.removeAllRanges();
+  let range = document.createRange();
+
+  element.innerHTML = "<table><tr id=tr><td id=td>A</td><td>B</td><tr></table>";
+  let td = document.getElementById("td");
+  range.selectNode(td);
+  // Don't throw exception
+  selection.addRange(range);
+  is(selection.anchorNode, document.getElementById("tr"),
+     "anchor node should be <TR> element");
+  element.innerHTML = "";
+}
+
+test(document.getElementById("nonedit"));
+test(document.getElementById("edit"));
+</script>
+</pre>
+</body>
+</html>
--- a/dom/html/test/test_fullscreen-api.html
+++ b/dom/html/test/test_fullscreen-api.html
@ -77,6 +77,15 @@ function shouldSkipTest(test) {
      }
    }
  }
+  if (SpecialPowers.DOMWindowUtils.isStyledByServo &&
+      SpecialPowers.isDebugBuild &&
+      navigator.platform.indexOf('Mac') >= 0) {
+    if (test == "file_fullscreen-backdrop.html") {
+      todo(false, `${test} skipped due to bug 1387942`);
+      return true;
+    }
+  }
+
  return false;
 }

--- a/dom/ipc/ContentChild.cpp
+++ b/dom/ipc/ContentChild.cpp
@ -73,6 +73,10 @@
 #include "GMPServiceChild.h"
 #include "NullPrincipal.h"

+#if !defined(XP_WIN)
+#include "mozilla/Omnijar.h"
+#endif
+
 #ifdef MOZ_GECKO_PROFILER
 #include "ChildProfilerController.h"
 #endif
@ -172,6 +176,14 @@
 #include "mozilla/audio/AudioNotificationReceiver.h"
 #endif

+#if defined(XP_MACOSX)
+#include <CoreServices/CoreServices.h>
+// Info.plist key associated with the developer repo path
+#define MAC_DEV_REPO_KEY "MozillaDeveloperRepoPath"
+// Info.plist key associated with the developer repo object directory
+#define MAC_DEV_OBJ_KEY "MozillaDeveloperObjPath"
+#endif /* XP_MACOSX */
+
 #ifdef MOZ_X11
 #include "mozilla/X11Util.h"
 #endif
@ -3563,4 +3575,125 @@ ContentChild::GetSpecificMessageEventTarget(const Message& aMsg)
 }

 } // namespace dom
+
+#if !defined(XP_WIN)
+bool IsDevelopmentBuild()
+{
+  nsCOMPtr<nsIFile> path = mozilla::Omnijar::GetPath(mozilla::Omnijar::GRE);
+  // If the path doesn't exist, we're a dev build.
+  return path == nullptr;
+}
+#endif /* !XP_WIN */
+
+#if defined(XP_MACOSX)
+/*
+ * Helper function to read a string value for a given key from the .app's
+ * Info.plist.
+ */
+static nsresult
+GetStringValueFromBundlePlist(const nsAString& aKey, nsAutoCString& aValue)
+{
+  CFBundleRef mainBundle = CFBundleGetMainBundle();
+  if (mainBundle == nullptr) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // Read this app's bundle Info.plist as a dictionary
+  CFDictionaryRef bundleInfoDict = CFBundleGetInfoDictionary(mainBundle);
+  if (bundleInfoDict == nullptr) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsAutoCString keyAutoCString = NS_ConvertUTF16toUTF8(aKey);
+  CFStringRef key = CFStringCreateWithCString(kCFAllocatorDefault,
+                                              keyAutoCString.get(),
+                                              kCFStringEncodingUTF8);
+  if (key == nullptr) {
+    return NS_ERROR_FAILURE;
+  }
+
+  CFStringRef value = (CFStringRef)CFDictionaryGetValue(bundleInfoDict, key);
+  CFRelease(key);
+  if (value == nullptr) {
+    return NS_ERROR_FAILURE;
+  }
+
+  CFIndex valueLength = CFStringGetLength(value);
+  if (valueLength == 0) {
+    return NS_ERROR_FAILURE;
+  }
+
+  const char* valueCString = CFStringGetCStringPtr(value,
+                                                   kCFStringEncodingUTF8);
+  if (valueCString) {
+    aValue.Assign(valueCString);
+    return NS_OK;
+  }
+
+  CFIndex maxLength =
+    CFStringGetMaximumSizeForEncoding(valueLength, kCFStringEncodingUTF8) + 1;
+  char* valueBuffer = static_cast<char*>(moz_xmalloc(maxLength));
+  if (!valueBuffer) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  if (!CFStringGetCString(value, valueBuffer, maxLength,
+                          kCFStringEncodingUTF8)) {
+    free(valueBuffer);
+    return NS_ERROR_FAILURE;
+  }
+
+  aValue.Assign(valueBuffer);
+  free(valueBuffer);
+  return NS_OK;
+}
+
+/*
+ * Helper function for reading a path string from the .app's Info.plist
+ * and returning a directory object for that path with symlinks resolved.
+ */
+static nsresult
+GetDirFromBundlePlist(const nsAString& aKey, nsIFile **aDir)
+{
+  nsresult rv;
+
+  nsAutoCString dirPath;
+  rv = GetStringValueFromBundlePlist(aKey, dirPath);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIFile> dir;
+  rv = NS_NewLocalFile(NS_ConvertUTF8toUTF16(dirPath),
+                       false,
+                       getter_AddRefs(dir));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = dir->Normalize();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool isDirectory = false;
+  rv = dir->IsDirectory(&isDirectory);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!isDirectory) {
+    return NS_ERROR_FILE_NOT_DIRECTORY;
+  }
+
+  dir.swap(*aDir);
+  return NS_OK;
+}
+
+nsresult
+GetRepoDir(nsIFile **aRepoDir)
+{
+  MOZ_ASSERT(IsDevelopmentBuild());
+  return GetDirFromBundlePlist(NS_LITERAL_STRING(MAC_DEV_REPO_KEY), aRepoDir);
+}
+
+nsresult
+GetObjDir(nsIFile **aObjDir)
+{
+  MOZ_ASSERT(IsDevelopmentBuild());
+  return GetDirFromBundlePlist(NS_LITERAL_STRING(MAC_DEV_OBJ_KEY), aObjDir);
+}
+#endif /* XP_MACOSX */
+
 } // namespace mozilla
--- a/dom/ipc/ContentChild.h
+++ b/dom/ipc/ContentChild.h
@ -40,6 +40,23 @@ class ChildProfilerController;

 using mozilla::loader::PScriptCacheChild;

+#if !defined(XP_WIN)
+// Returns whether or not the currently running build is an unpackaged
+// developer build. This check is implemented by looking for omni.ja in the
+// the obj/dist dir. We use this routine to detect when the build dir will
+// use symlinks to the repo and object dir. On Windows, dev builds don't
+// use symlinks.
+bool IsDevelopmentBuild();
+#endif /* !XP_WIN */
+
+#if defined(XP_MACOSX)
+// Return the repo directory and the repo object directory respectively. These
+// should only be used on Mac developer builds to determine the path to the
+// repo or object directory.
+nsresult GetRepoDir(nsIFile **aRepoDir);
+nsresult GetObjDir(nsIFile **aObjDir);
+#endif /* XP_MACOSX */
+
 namespace ipc {
 class OptionalURIParams;
 class URIParams;
--- a/dom/media/BufferMediaResource.h
+++ b/dom/media/BufferMediaResource.h
@ -43,8 +43,6 @@ private:
    return principal.forget();
  }
  // These methods are called off the main thread.
-  // The mode is initially MODE_PLAYBACK.
-  void SetReadMode(MediaCacheStream::ReadMode aMode) override {}
  nsresult ReadAt(int64_t aOffset, char* aBuffer,
                  uint32_t aCount, uint32_t* aBytes) override
  {
--- a/dom/media/ChannelMediaDecoder.cpp
+++ b/dom/media/ChannelMediaDecoder.cpp
@ -254,6 +254,9 @@ ChannelMediaDecoder::Load(nsIChannel* aChannel,
  rv = OpenResource(aStreamListener);
  NS_ENSURE_SUCCESS(rv, rv);

+  // Set mode to METADATA since we are about to read metadata.
+  mResource->SetReadMode(MediaCacheStream::MODE_METADATA);
+
  SetStateMachine(CreateStateMachine());
  NS_ENSURE_TRUE(GetStateMachine(), NS_ERROR_FAILURE);

@ -501,6 +504,17 @@ ChannelMediaDecoder::Resume()
  }
 }

+void
+ChannelMediaDecoder::MetadataLoaded(
+  UniquePtr<MediaInfo> aInfo,
+  UniquePtr<MetadataTags> aTags,
+  MediaDecoderEventVisibility aEventVisibility)
+{
+  MediaDecoder::MetadataLoaded(Move(aInfo), Move(aTags), aEventVisibility);
+  // Set mode to PLAYBACK after reading metadata.
+  mResource->SetReadMode(MediaCacheStream::MODE_PLAYBACK);
+}
+
 } // namespace mozilla

 // avoid redefined macro in unified build
--- a/dom/media/ChannelMediaDecoder.h
+++ b/dom/media/ChannelMediaDecoder.h
@ -57,6 +57,10 @@ protected:
  void OnPlaybackEvent(MediaEventType aEvent) override;
  void DurationChanged() override;
  void DownloadProgressed() override;
+  void MetadataLoaded(UniquePtr<MediaInfo> aInfo,
+                      UniquePtr<MetadataTags> aTags,
+                      MediaDecoderEventVisibility aEventVisibility) override;
+
  RefPtr<ResourceCallback> mResourceCallback;
  RefPtr<BaseMediaResource> mResource;

--- a/dom/media/MediaCache.cpp
+++ b/dom/media/MediaCache.cpp
@ -2124,14 +2124,6 @@ MediaCacheStream::Close()
  mMediaCache->QueueUpdate();
 }

-void
-MediaCacheStream::EnsureCacheUpdate()
-{
-  if (mHasHadUpdate)
-    return;
-  mMediaCache->Update();
-}
-
 void
 MediaCacheStream::CloseInternal(ReentrantMonitorAutoEnter& aReentrantMonitor)
 {
--- a/dom/media/MediaCache.h
+++ b/dom/media/MediaCache.h
@ -232,11 +232,6 @@ public:
  // Get the principal for this stream. Anything accessing the contents of
  // this stream must have a principal that subsumes this principal.
  nsIPrincipal* GetCurrentPrincipal() { return mPrincipal; }
-  // Ensure a global media cache update has run with this stream present.
-  // This ensures the cache has had a chance to suspend or unsuspend this stream.
-  // Called only on main thread. This can change the state of streams, fire
-  // notifications, etc.
-  void EnsureCacheUpdate();

  // These callbacks are called on the main thread by the client
  // when data has been received via the channel.
--- a/dom/media/MediaDecoder.cpp
+++ b/dom/media/MediaDecoder.cpp
@ -812,9 +812,6 @@ MediaDecoder::FirstFrameLoaded(nsAutoPtr<MediaInfo> aInfo,

  Invalidate();

-  // This can run cache callbacks.
-  GetResource()->EnsureCacheUpToDate();
-
  // The element can run javascript via events
  // before reaching here, so only change the
  // state if we're still set to the original
@ -823,10 +820,6 @@ MediaDecoder::FirstFrameLoaded(nsAutoPtr<MediaInfo> aInfo,
    ChangeState(mNextState);
  }

-  // Run NotifySuspendedStatusChanged now to give us a chance to notice
-  // that autoplay should run.
-  NotifySuspendedStatusChanged();
-
  // GetOwner()->FirstFrameLoaded() might call us back. Put it at the bottom of
  // this function to avoid unexpected shutdown from reentrant calls.
  if (aEventVisibility != MediaDecoderEventVisibility::Suppressed) {
--- a/dom/media/MediaDecoder.h
+++ b/dom/media/MediaDecoder.h
@ -450,6 +450,12 @@ protected:

  virtual void OnPlaybackEvent(MediaEventType aEvent);

+  // Called when the metadata from the media file has been loaded by the
+  // state machine. Call on the main thread only.
+  virtual void MetadataLoaded(UniquePtr<MediaInfo> aInfo,
+                              UniquePtr<MetadataTags> aTags,
+                              MediaDecoderEventVisibility aEventVisibility);
+
  /******
   * The following members should be accessed with the decoder lock held.
   ******/
@ -490,12 +496,6 @@ protected:
 private:
  nsCString GetDebugInfo();

-  // Called when the metadata from the media file has been loaded by the
-  // state machine. Call on the main thread only.
-  void MetadataLoaded(UniquePtr<MediaInfo> aInfo,
-                      UniquePtr<MetadataTags> aTags,
-                      MediaDecoderEventVisibility aEventVisibility);
-
  // Called when the owner's activity changed.
  void NotifyCompositor();

--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@ -341,9 +341,6 @@ public:
    MOZ_ASSERT(!mMetadataRequest.Exists());
    SLOG("Dispatching AsyncReadMetadata");

-    // Set mode to METADATA since we are about to read metadata.
-    Resource()->SetReadMode(MediaCacheStream::MODE_METADATA);
-
    // We disconnect mMetadataRequest in Exit() so it is fine to capture
    // a raw pointer here.
    Reader()->ReadMetadata()
@ -1867,17 +1864,23 @@ public:

  void HandleAudioDecoded(AudioData* aAudio) override
  {
+    mMaster->PushAudio(aAudio);
+    if (!mMaster->HaveEnoughDecodedAudio()) {
+      mMaster->RequestAudioData();
+    }
    // This might be the sample we need to exit buffering.
    // Schedule Step() to check it.
-    mMaster->PushAudio(aAudio);
    mMaster->ScheduleStateMachine();
  }

  void HandleVideoDecoded(VideoData* aVideo, TimeStamp aDecodeStart) override
  {
+    mMaster->PushVideo(aVideo);
+    if (!mMaster->HaveEnoughDecodedVideo()) {
+      mMaster->RequestVideoData(media::TimeUnit());
+    }
    // This might be the sample we need to exit buffering.
    // Schedule Step() to check it.
-    mMaster->PushVideo(aVideo);
    mMaster->ScheduleStateMachine();
  }

@ -1924,8 +1927,6 @@ public:
  }

 private:
-  void DispatchDecodeTasksIfNeeded();
-
  TimeStamp mBufferingStart;

  // The maximum number of second we spend buffering when we are short on
@ -2224,9 +2225,6 @@ DecodeMetadataState::OnMetadataRead(MetadataHolder&& aMetadata)
 {
  mMetadataRequest.Complete();

-  // Set mode to PLAYBACK after reading metadata.
-  Resource()->SetReadMode(MediaCacheStream::MODE_PLAYBACK);
-
  mMaster->mInfo.emplace(*aMetadata.mInfo);
  mMaster->mMediaSeekable = Info().mMediaSeekable;
  mMaster->mMediaSeekableOnlyInBufferedRanges =
@ -2542,25 +2540,6 @@ SeekingState::SeekCompleted()
  GoToNextState();
 }

-void
-MediaDecoderStateMachine::
-BufferingState::DispatchDecodeTasksIfNeeded()
-{
-  if (mMaster->IsAudioDecoding()
-      && !mMaster->HaveEnoughDecodedAudio()
-      && !mMaster->IsRequestingAudioData()
-      && !mMaster->IsWaitingAudioData()) {
-    mMaster->RequestAudioData();
-  }
-
-  if (mMaster->IsVideoDecoding()
-      && !mMaster->HaveEnoughDecodedVideo()
-      && !mMaster->IsRequestingVideoData()
-      && !mMaster->IsWaitingVideoData()) {
-    mMaster->RequestVideoData(media::TimeUnit());
-  }
-}
-
 void
 MediaDecoderStateMachine::
 BufferingState::Step()
@ -2582,11 +2561,9 @@ BufferingState::Step()
      SLOG("Buffering: wait %ds, timeout in %.3lfs",
           mBufferingWait, mBufferingWait - elapsed.ToSeconds());
      mMaster->ScheduleStateMachineIn(TimeUnit::FromMicroseconds(USECS_PER_S));
-      DispatchDecodeTasksIfNeeded();
      return;
    }
  } else if (mMaster->OutOfDecodedAudio() || mMaster->OutOfDecodedVideo()) {
-    DispatchDecodeTasksIfNeeded();
    MOZ_ASSERT(!mMaster->OutOfDecodedAudio()
               || mMaster->IsRequestingAudioData()
               || mMaster->IsWaitingAudioData());
--- a/dom/media/MediaResource.cpp
+++ b/dom/media/MediaResource.cpp
@ -975,12 +975,6 @@ ChannelMediaResource::IsDataCachedToEndOfResource(int64_t aOffset)
  return mCacheStream.IsDataCachedToEndOfStream(aOffset);
 }

-void
-ChannelMediaResource::EnsureCacheUpToDate()
-{
-  mCacheStream.EnsureCacheUpdate();
-}
-
 bool
 ChannelMediaResource::IsSuspendedByCache()
 {
--- a/dom/media/MediaResource.h
+++ b/dom/media/MediaResource.h
@ -164,8 +164,6 @@ public:
  virtual already_AddRefed<nsIPrincipal> GetCurrentPrincipal() = 0;

  // These methods are called off the main thread.
-  // The mode is initially MODE_PLAYBACK.
-  virtual void SetReadMode(MediaCacheStream::ReadMode aMode) = 0;
  // Read up to aCount bytes from the stream. The read starts at
  // aOffset in the stream, seeking to that location initially if
  // it is not the current stream offset. The remaining arguments,
@ -194,9 +192,6 @@ public:
  // media.
  // A call to ReadAt will update this position.
  virtual int64_t Tell() = 0;
-  // Ensures that the value returned by IsSuspendedByCache below is up to date
-  // (i.e. the cache has examined this stream at least once).
-  virtual void EnsureCacheUpToDate() {}

  // These can be called on any thread.
  // Cached blocks associated with this stream will not be evicted
@ -325,6 +320,9 @@ public:
  // Resume any downloads that have been suspended.
  virtual void Resume() = 0;

+  // The mode is initially MODE_PLAYBACK.
+  virtual void SetReadMode(MediaCacheStream::ReadMode aMode) = 0;
+
  /**
   * Open the stream. This creates a stream listener and returns it in
   * aStreamListener; this listener needs to be notified of incoming data.
@ -507,7 +505,6 @@ public:
  already_AddRefed<BaseMediaResource> CloneData(
    MediaResourceCallback* aDecoder) override;
  nsresult ReadFromCache(char* aBuffer, int64_t aOffset, uint32_t aCount) override;
-  void     EnsureCacheUpToDate() override;

  // Other thread
  void     SetReadMode(MediaCacheStream::ReadMode aMode) override;
--- a/dom/media/gtest/MockMediaResource.h
+++ b/dom/media/gtest/MockMediaResource.h
@ -20,7 +20,6 @@ public:
  {
    return nullptr;
  }
-  void SetReadMode(MediaCacheStream::ReadMode aMode) override {}
  nsresult ReadAt(int64_t aOffset, char* aBuffer, uint32_t aCount,
                  uint32_t* aBytes) override;
  // Data stored in file, caching recommended.
--- a/dom/media/hls/HLSResource.h
+++ b/dom/media/hls/HLSResource.h
@ -48,7 +48,6 @@ public:
  ~HLSResource();
  void Suspend();
  void Resume();
-  void SetReadMode(MediaCacheStream::ReadMode aMode) override { UNIMPLEMENTED(); }
  nsresult ReadAt(int64_t aOffset, char* aBuffer, uint32_t aCount, uint32_t* aBytes) override { UNIMPLEMENTED(); return NS_ERROR_FAILURE; }
  bool ShouldCacheReads() override { UNIMPLEMENTED(); return false; }
  int64_t Tell() override { UNIMPLEMENTED(); return -1; }
--- a/dom/media/mediasource/MediaSourceResource.h
+++ b/dom/media/mediasource/MediaSourceResource.h
@ -32,7 +32,6 @@ public:
    , mEnded(false)
    {}

-  void SetReadMode(MediaCacheStream::ReadMode aMode) override { UNIMPLEMENTED(); }
  nsresult ReadAt(int64_t aOffset, char* aBuffer, uint32_t aCount, uint32_t* aBytes) override { UNIMPLEMENTED(); return NS_ERROR_FAILURE; }
  bool ShouldCacheReads() override { UNIMPLEMENTED(); return false; }
  int64_t Tell() override { UNIMPLEMENTED(); return -1; }
--- a/dom/media/mediasource/SourceBufferResource.h
+++ b/dom/media/mediasource/SourceBufferResource.h
@ -45,10 +45,6 @@ public:
    UNIMPLEMENTED();
    return nullptr;
  }
-  void SetReadMode(MediaCacheStream::ReadMode aMode) override
-  {
-    UNIMPLEMENTED();
-  }
  nsresult ReadAt(int64_t aOffset,
                  char* aBuffer,
                  uint32_t aCount,
--- a/dom/media/test/manifest.js
+++ b/dom/media/test/manifest.js
@ -27,7 +27,7 @@ function manifestVideo() {
 // name "mochi.test".
 let serverUrl = SpecialPowers.Services.prefs.getCharPref("media.hls.server.url");
 var gHLSTests = [
-  { name: serverUrl + "/bipbop_4x3_variant.m3u8", type:"audio/x-mpegurl", duration:19.95334 }
+  { name: serverUrl + "/bipbop_4x3_variant.m3u8", type:"audio/x-mpegurl", duration:20.000 }
 ];

 // These are small test files, good for just seeing if something loads. We
--- a/dom/media/test/reftest/reftest.list
+++ b/dom/media/test/reftest/reftest.list
@ -1,3 +1,3 @@
-skip-if(Android) fuzzy-if(OSX,22,49977) skip-if(winWidget) fuzzy-if(webrender,70,600) HTTP(..) == short.mp4.firstframe.html short.mp4.firstframe-ref.html
-skip-if(Android) fuzzy-if(OSX,23,51392) fuzzy-if(winWidget,59,76797) fuzzy-if(webrender,60,1800) HTTP(..) == short.mp4.lastframe.html short.mp4.lastframe-ref.html
-skip-if(Android) skip-if(winWidget) fuzzy-if(webrender,55,4281) fuzzy-if(OSX,3,111852) HTTP(..) == bipbop_300_215kbps.mp4.lastframe.html bipbop_300_215kbps.mp4.lastframe-ref.html
+skip-if(Android) fuzzy-if(OSX,22,49977) skip-if(winWidget) fuzzy-if(gtkWidget&&layersGPUAccelerated,70,600) HTTP(..) == short.mp4.firstframe.html short.mp4.firstframe-ref.html
+skip-if(Android) fuzzy-if(OSX,23,51392) fuzzy-if(winWidget,59,76797) fuzzy-if(gtkWidget&&layersGPUAccelerated,60,1800) HTTP(..) == short.mp4.lastframe.html short.mp4.lastframe-ref.html
+skip-if(Android) skip-if(winWidget) fuzzy-if(gtkWidget&&layersGPUAccelerated,55,4281) fuzzy-if(OSX,3,111852) HTTP(..) == bipbop_300_215kbps.mp4.lastframe.html bipbop_300_215kbps.mp4.lastframe-ref.html
--- a/dom/media/webaudio/AudioContext.cpp
+++ b/dom/media/webaudio/AudioContext.cpp
@ -217,6 +217,18 @@ AudioContext::Constructor(const GlobalObject& aGlobal,
  return object.forget();
 }

+/* static */ already_AddRefed<AudioContext>
+AudioContext::Constructor(const GlobalObject& aGlobal,
+                          const OfflineAudioContextOptions& aOptions,
+                          ErrorResult& aRv)
+{
+  return Constructor(aGlobal,
+                     aOptions.mNumberOfChannels,
+                     aOptions.mLength,
+                     aOptions.mSampleRate,
+                     aRv);
+}
+
 /* static */ already_AddRefed<AudioContext>
 AudioContext::Constructor(const GlobalObject& aGlobal,
                          uint32_t aNumberOfChannels,
--- a/dom/media/webaudio/AudioContext.h
+++ b/dom/media/webaudio/AudioContext.h
@ -7,6 +7,7 @@
 #ifndef AudioContext_h_
 #define AudioContext_h_

+#include "mozilla/dom/OfflineAudioContextBinding.h"
 #include "MediaBufferDecoder.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/DOMEventTargetHelper.h"
@ -152,6 +153,12 @@ public:
  static already_AddRefed<AudioContext>
  Constructor(const GlobalObject& aGlobal, ErrorResult& aRv);

+  // Constructor for offline AudioContext with options object
+  static already_AddRefed<AudioContext>
+  Constructor(const GlobalObject& aGlobal,
+              const OfflineAudioContextOptions& aOptions,
+              ErrorResult& aRv);
+
  // Constructor for offline AudioContext
  static already_AddRefed<AudioContext>
  Constructor(const GlobalObject& aGlobal,
--- a/dom/media/webaudio/test/test_OfflineAudioContext.html
+++ b/dom/media/webaudio/test/test_OfflineAudioContext.html
@ -31,17 +31,28 @@ function setOrCompareRenderedBuffer(aRenderedBuffer) {

 SimpleTest.waitForExplicitFinish();
 addLoadEvent(function() {
-  var ctx = new OfflineAudioContext(2, 100, 22050);
-  ok(ctx instanceof EventTarget, "OfflineAudioContexts must be EventTargets");
-  is(ctx.length, 100, "OfflineAudioContext.length is equal to the value passed to the ctor.");
+  let ctxs = [
+    new OfflineAudioContext(2, 100, 22050),
+    new OfflineAudioContext({length: 100, sampleRate: 22050}),
+    new OfflineAudioContext({channels: 2, length: 100, sampleRate: 22050}),
+  ];

-  var buf = ctx.createBuffer(2, 100, ctx.sampleRate);
-  for (var i = 0; i < 2; ++i) {
-    for (var j = 0; j < 100; ++j) {
-      buf.getChannelData(i)[j] = Math.sin(2 * Math.PI * 200 * j / ctx.sampleRate);
+  for (let ctx of ctxs) {
+    ok(ctx instanceof EventTarget, "OfflineAudioContexts must be EventTargets");
+    is(ctx.length, 100, "OfflineAudioContext.length is equal to the value passed to the ctor.");
+
+    var buf = ctx.createBuffer(2, 100, ctx.sampleRate);
+    for (var i = 0; i < 2; ++i) {
+      for (var j = 0; j < 100; ++j) {
+        buf.getChannelData(i)[j] = Math.sin(2 * Math.PI * 200 * j / ctx.sampleRate);
+      }
    }
  }

+  is(ctxs[1].destination.channelCount, 1, "OfflineAudioContext defaults to to correct channelCount.");
+
+  let ctx = ctxs[0];
+
  expectException(function() {
    new OfflineAudioContext(2, 100, 0);
  }, DOMException.NOT_SUPPORTED_ERR);
@ -58,6 +69,15 @@ addLoadEvent(function() {
  expectException(function() {
    new OfflineAudioContext(2, 0, 44100);
  }, DOMException.NOT_SUPPORTED_ERR);
+  expectTypeError(function() {
+    new OfflineAudioContext({});
+  });
+  expectTypeError(function() {
+    new OfflineAudioContext({sampleRate: 44100});
+  });
+  expectTypeError(function() {
+    new OfflineAudioContext({length: 44100*40});
+  });

  var src = ctx.createBufferSource();
  src.buffer = buf;
--- a/dom/vr/VREventObserver.cpp
+++ b/dom/vr/VREventObserver.cpp
@ -50,9 +50,8 @@ VREventObserver::DisconnectFromOwner()
    // The WebVR content is closed, and we will collect the telemetry info
    // for the users who view it in 2D view only.
    Telemetry::Accumulate(Telemetry::WEBVR_USERS_VIEW_IN, 0);
-    Telemetry::Accumulate(Telemetry::WEBVR_TIME_SPEND_FOR_VIEWING_IN_2D,
-                          static_cast<uint32_t>((TimeStamp::Now() - mSpendTimeIn2DView)
-                          .ToMilliseconds()));
+    Telemetry::AccumulateTimeDelta(Telemetry::WEBVR_TIME_SPENT_VIEWING_IN_2D,
+                                   mSpendTimeIn2DView);
  }
  mWindow = nullptr;

--- a/dom/webidl/OfflineAudioContext.webidl
+++ b/dom/webidl/OfflineAudioContext.webidl
@ -10,7 +10,14 @@
 * liability, trademark and document use rules apply.
 */

-[Constructor(unsigned long numberOfChannels, unsigned long length, float sampleRate),
+dictionary OfflineAudioContextOptions {
+             unsigned long numberOfChannels = 1;
+    required unsigned long length;
+    required float         sampleRate;
+};
+
+[Constructor (OfflineAudioContextOptions contextOptions),
+Constructor(unsigned long numberOfChannels, unsigned long length, float sampleRate),
 Pref="dom.webaudio.enabled"]
 interface OfflineAudioContext : BaseAudioContext {

--- a/editor/libeditor/CompositionTransaction.cpp
+++ b/editor/libeditor/CompositionTransaction.cpp
@ -198,8 +198,7 @@ CompositionTransaction::SetIMESelection(EditorBase& aEditorBase,
  RefPtr<Selection> selection = aEditorBase.GetSelection();
  NS_ENSURE_TRUE(selection, NS_ERROR_NOT_INITIALIZED);

-  nsresult rv = selection->StartBatchChanges();
-  NS_ENSURE_SUCCESS(rv, rv);
+  SelectionBatcher selectionBatcher(selection);

  // First, remove all selections of IME composition.
  static const RawSelectionType kIMESelections[] = {
@ -213,6 +212,7 @@ CompositionTransaction::SetIMESelection(EditorBase& aEditorBase,
  aEditorBase.GetSelectionController(getter_AddRefs(selCon));
  NS_ENSURE_TRUE(selCon, NS_ERROR_NOT_INITIALIZED);

+  nsresult rv = NS_OK;
  for (uint32_t i = 0; i < ArrayLength(kIMESelections); ++i) {
    nsCOMPtr<nsISelection> selectionOfIME;
    if (NS_FAILED(selCon->GetSelection(kIMESelections[i],
@ -335,9 +335,6 @@ CompositionTransaction::SetIMESelection(EditorBase& aEditorBase,
    }
  }

-  rv = selection->EndBatchChangesInternal();
-  NS_ASSERTION(NS_SUCCEEDED(rv), "Failed to end batch changes");
-
  return rv;
 }

--- a/editor/libeditor/EditorBase.cpp
+++ b/editor/libeditor/EditorBase.cpp
@ -724,7 +724,7 @@ EditorBase::DoTransaction(Selection* aSelection, nsITransaction* aTxn)
    RefPtr<Selection> selection = aSelection ? aSelection : GetSelection();
    NS_ENSURE_TRUE(selection, NS_ERROR_NULL_POINTER);

-    selection->StartBatchChanges();
+    SelectionBatcher selectionBatcher(selection);

    nsresult rv;
    if (mTxnMgr) {
@ -733,14 +733,11 @@ EditorBase::DoTransaction(Selection* aSelection, nsITransaction* aTxn)
    } else {
      rv = aTxn->DoTransaction();
    }
-    if (NS_SUCCEEDED(rv)) {
-      DoAfterDoTransaction(aTxn);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
    }

-    // no need to check rv here, don't lose result of operation
-    selection->EndBatchChanges();
-
-    NS_ENSURE_SUCCESS(rv, rv);
+    DoAfterDoTransaction(aTxn);
  }

  return NS_OK;
--- a/gfx/2d/DrawTargetSkia.cpp
+++ b/gfx/2d/DrawTargetSkia.cpp
@ -1261,7 +1261,13 @@ DrawTargetSkia::FillGlyphsWithCG(ScaledFont *aFont,
    return false;
  }

-  SetFontSmoothingBackgroundColor(cgContext, mColorSpace, aRenderingOptions);
+  if (mPushedLayers.empty()) {
+    // Respect the font smoothing background color, but only if no layer is
+    // currently pushed, because this color usually describes what's under this
+    // DrawTarget, and not what's within this DrawTarget under the currently
+    // pushed layer.
+    SetFontSmoothingBackgroundColor(cgContext, mColorSpace, aRenderingOptions);
+  }
  SetFontColor(cgContext, mColorSpace, aPattern);

  ScaledFontMac* macFont = static_cast<ScaledFontMac*>(aFont);
--- a/gfx/doc/README.webrender
+++ b/gfx/doc/README.webrender
@ -79,4 +79,4 @@ to make sure that mozjs_sys also has its Cargo.lock file updated if needed, henc
 the need to run the cargo update command in js/src as well. Hopefully this will
 be resolved soon.

-Latest Commit: 0748e02d1be5f889fc17de2eb81c0c363ee3aa80
+Latest Commit: e68c8acb021656440d26ac46e705e7ceb31891e6
--- a/gfx/layers/ipc/CompositorBridgeParent.cpp
+++ b/gfx/layers/ipc/CompositorBridgeParent.cpp
@ -463,6 +463,9 @@ CompositorBridgeParent::StopAndClearResources()
    });
    mWrBridge->Destroy();
    mWrBridge = nullptr;
+    mAsyncImageManager->Destroy();
+    // WebRenderAPI should be already destructed
+    mAsyncImageManager = nullptr;
  }

  if (mCompositor) {
@ -1654,8 +1657,9 @@ CompositorBridgeParent::RecvAdoptChild(const uint64_t& child)
      ScheduleComposition();
    }
    if (mWrBridge && sIndirectLayerTrees[child].mWrBridge) {
+      RefPtr<wr::WebRenderAPI> api = mWrBridge->GetWebRenderAPI()->Clone();
      sIndirectLayerTrees[child].mWrBridge->UpdateWebRender(mWrBridge->CompositorScheduler(),
-                                                            mWrBridge->GetWebRenderAPI(),
+                                                            api,
                                                            mWrBridge->AsyncImageManager(),
                                                            GetAnimationStorage());
      // Pretend we composited, since parent CompositorBridgeParent was replaced.
@ -1695,8 +1699,6 @@ CompositorBridgeParent::AllocPWebRenderBridgeParent(const wr::PipelineId& aPipel
  RefPtr<widget::CompositorWidget> widget = mWidget;
  RefPtr<wr::WebRenderAPI> api = wr::WebRenderAPI::Create(
    gfxPrefs::WebRenderProfilerEnabled(), this, Move(widget), aSize);
-  RefPtr<AsyncImagePipelineManager> asyncMgr =
-    new AsyncImagePipelineManager(WebRenderBridgeParent::AllocIdNameSpace());
  if (!api) {
    mWrBridge = WebRenderBridgeParent::CreateDestroyed();
    mWrBridge.get()->AddRef(); // IPDL reference
@ -1704,6 +1706,8 @@ CompositorBridgeParent::AllocPWebRenderBridgeParent(const wr::PipelineId& aPipel
    *aTextureFactoryIdentifier = TextureFactoryIdentifier(LayersBackend::LAYERS_NONE);
    return mWrBridge;
  }
+  mAsyncImageManager = new AsyncImagePipelineManager(api->Clone());
+  RefPtr<AsyncImagePipelineManager> asyncMgr = mAsyncImageManager;
  api->SetRootPipeline(aPipelineId);
  RefPtr<CompositorAnimationStorage> animStorage = GetAnimationStorage();
  mWrBridge = new WebRenderBridgeParent(this, aPipelineId, mWidget, nullptr, Move(api), Move(asyncMgr), Move(animStorage));
@ -1953,10 +1957,10 @@ CompositorBridgeParent::DidComposite(TimeStamp& aCompositeStart,
 void
 CompositorBridgeParent::NotifyDidCompositeToPipeline(const wr::PipelineId& aPipelineId, const wr::Epoch& aEpoch, TimeStamp& aCompositeStart, TimeStamp& aCompositeEnd)
 {
-  if (!mWrBridge) {
+  if (!mWrBridge || !mAsyncImageManager) {
    return;
  }
-  mWrBridge->AsyncImageManager()->Update(aPipelineId, aEpoch);
+  mAsyncImageManager->Update(aPipelineId, aEpoch);

  if (mPaused) {
    return;
--- a/gfx/layers/ipc/CompositorBridgeParent.h
+++ b/gfx/layers/ipc/CompositorBridgeParent.h
@ -65,6 +65,7 @@ namespace layers {
 class APZCTreeManager;
 class APZCTreeManagerParent;
 class AsyncCompositionManager;
+class AsyncImagePipelineManager;
 class Compositor;
 class CompositorAnimationStorage;
 class CompositorBridgeParent;
@ -580,6 +581,7 @@ protected:
  RefPtr<HostLayerManager> mLayerManager;
  RefPtr<Compositor> mCompositor;
  RefPtr<AsyncCompositionManager> mCompositionManager;
+  RefPtr<AsyncImagePipelineManager> mAsyncImageManager;
  RefPtr<WebRenderBridgeParent> mWrBridge;
  widget::CompositorWidget* mWidget;
  TimeStamp mTestTime;
--- a/gfx/layers/ipc/CrossProcessCompositorBridgeParent.cpp
+++ b/gfx/layers/ipc/CrossProcessCompositorBridgeParent.cpp
@ -225,7 +225,7 @@ CrossProcessCompositorBridgeParent::AllocPWebRenderBridgeParent(const wr::Pipeli
  }
  WebRenderBridgeParent* root = sIndirectLayerTrees[cbp->RootLayerTreeId()].mWrBridge.get();

-  RefPtr<wr::WebRenderAPI> api = root->GetWebRenderAPI();
+  RefPtr<wr::WebRenderAPI> api = root->GetWebRenderAPI()->Clone();
  RefPtr<AsyncImagePipelineManager> holder = root->AsyncImageManager();
  RefPtr<CompositorAnimationStorage> animStorage = cbp->GetAnimationStorage();
  parent = new WebRenderBridgeParent(this, aPipelineId, nullptr, root->CompositorScheduler(), Move(api), Move(holder), Move(animStorage));
--- a/gfx/layers/wr/AsyncImagePipelineManager.cpp
+++ b/gfx/layers/wr/AsyncImagePipelineManager.cpp
@ -23,8 +23,9 @@ AsyncImagePipelineManager::AsyncImagePipeline::AsyncImagePipeline()
 , mMixBlendMode(wr::MixBlendMode::Normal)
 {}

-AsyncImagePipelineManager::AsyncImagePipelineManager(wr::IdNamespace aIdNamespace)
- : mIdNamespace(aIdNamespace)
+AsyncImagePipelineManager::AsyncImagePipelineManager(already_AddRefed<wr::WebRenderAPI>&& aApi)
+ : mApi(aApi)
+ , mIdNamespace(mApi->GetNamespace())
 , mResourceId(0)
 , mAsyncImageEpoch(0)
 , mDestroyed(false)
@ -38,9 +39,11 @@ AsyncImagePipelineManager::~AsyncImagePipelineManager()
 }

 void
-AsyncImagePipelineManager::Destroy(wr::WebRenderAPI* aApi)
+AsyncImagePipelineManager::Destroy()
 {
-  DeleteOldAsyncImages(aApi);
+  MOZ_ASSERT(!mDestroyed);
+  DeleteOldAsyncImages();
+  mApi = nullptr;
  mDestroyed = true;
 }

@ -51,10 +54,11 @@ AsyncImagePipelineManager::HasKeysToDelete()
 }

 void
-AsyncImagePipelineManager::DeleteOldAsyncImages(wr::WebRenderAPI* aApi)
+AsyncImagePipelineManager::DeleteOldAsyncImages()
 {
+  MOZ_ASSERT(!mDestroyed);
  for (wr::ImageKey key : mKeysToDelete) {
-    aApi->DeleteImage(key);
+    mApi->DeleteImage(key);
  }
  mKeysToDelete.Clear();
 }
@ -111,7 +115,7 @@ AsyncImagePipelineManager::AddAsyncImagePipeline(const wr::PipelineId& aPipeline
 }

 void
-AsyncImagePipelineManager::RemoveAsyncImagePipeline(wr::WebRenderAPI* aApi, const wr::PipelineId& aPipelineId)
+AsyncImagePipelineManager::RemoveAsyncImagePipeline(const wr::PipelineId& aPipelineId)
 {
  if (mDestroyed) {
    return;
@ -121,9 +125,9 @@ AsyncImagePipelineManager::RemoveAsyncImagePipeline(wr::WebRenderAPI* aApi, cons
  if (auto entry = mAsyncImagePipelines.Lookup(id)) {
    AsyncImagePipeline* holder = entry.Data();
    ++mAsyncImageEpoch; // Update webrender epoch
-    aApi->ClearRootDisplayList(wr::NewEpoch(mAsyncImageEpoch), aPipelineId);
+    mApi->ClearRootDisplayList(wr::NewEpoch(mAsyncImageEpoch), aPipelineId);
    for (wr::ImageKey key : holder->mKeys) {
-      aApi->DeleteImage(key);
+      mApi->DeleteImage(key);
    }
    entry.Remove();
    RemovePipeline(aPipelineId, wr::NewEpoch(mAsyncImageEpoch));
@ -155,7 +159,7 @@ AsyncImagePipelineManager::UpdateAsyncImagePipeline(const wr::PipelineId& aPipel
 }

 bool
-AsyncImagePipelineManager::GenerateImageKeyForTextureHost(wr::WebRenderAPI* aApi, TextureHost* aTexture, nsTArray<wr::ImageKey>& aKeys)
+AsyncImagePipelineManager::GenerateImageKeyForTextureHost(TextureHost* aTexture, nsTArray<wr::ImageKey>& aKeys)
 {
  MOZ_ASSERT(aKeys.IsEmpty());
  MOZ_ASSERT(aTexture);
@ -166,7 +170,7 @@ AsyncImagePipelineManager::GenerateImageKeyForTextureHost(wr::WebRenderAPI* aApi
    wrTexture->GetWRImageKeys(aKeys, std::bind(&AsyncImagePipelineManager::GenerateImageKey, this));
    MOZ_ASSERT(!aKeys.IsEmpty());
    Range<const wr::ImageKey> keys(&aKeys[0], aKeys.Length());
-    wrTexture->AddWRImage(aApi, keys, wrTexture->GetExternalImageKey());
+    wrTexture->AddWRImage(mApi, keys, wrTexture->GetExternalImageKey());
    return true;
  } else {
    RefPtr<gfx::DataSourceSurface> dSurf = aTexture->GetAsSurface();
@ -185,15 +189,14 @@ AsyncImagePipelineManager::GenerateImageKeyForTextureHost(wr::WebRenderAPI* aApi

    wr::ImageKey key = GenerateImageKey();
    aKeys.AppendElement(key);
-    aApi->AddImage(key, descriptor, slice);
+    mApi->AddImage(key, descriptor, slice);
    dSurf->Unmap();
  }
  return false;
 }

 bool
-AsyncImagePipelineManager::UpdateImageKeys(wr::WebRenderAPI* aApi,
-                                           bool& aUseExternalImage,
+AsyncImagePipelineManager::UpdateImageKeys(bool& aUseExternalImage,
                                           AsyncImagePipeline* aImageMgr,
                                           nsTArray<wr::ImageKey>& aKeys,
                                           nsTArray<wr::ImageKey>& aKeysToDelete)
@ -231,7 +234,7 @@ AsyncImagePipelineManager::UpdateImageKeys(wr::WebRenderAPI* aApi,
    return true;
  }

-  aUseExternalImage = aImageMgr->mUseExternalImage = GenerateImageKeyForTextureHost(aApi, texture, aKeys);
+  aUseExternalImage = aImageMgr->mUseExternalImage = GenerateImageKeyForTextureHost(texture, aKeys);
  MOZ_ASSERT(!aKeys.IsEmpty());
  aImageMgr->mKeys.AppendElements(aKeys);
  aImageMgr->mCurrentTexture = texture;
@ -239,7 +242,7 @@ AsyncImagePipelineManager::UpdateImageKeys(wr::WebRenderAPI* aApi,
 }

 void
-AsyncImagePipelineManager::ApplyAsyncImages(wr::WebRenderAPI* aApi)
+AsyncImagePipelineManager::ApplyAsyncImages()
 {
  if (mDestroyed || mAsyncImagePipelines.Count() == 0) {
    return;
@ -255,8 +258,7 @@ AsyncImagePipelineManager::ApplyAsyncImages(wr::WebRenderAPI* aApi)

    nsTArray<wr::ImageKey> keys;
    bool useExternalImage = false;
-    bool updateDisplayList = UpdateImageKeys(aApi,
-                                             useExternalImage,
+    bool updateDisplayList = UpdateImageKeys(useExternalImage,
                                             pipeline,
                                             keys,
                                             keysToDelete);
@ -306,11 +308,11 @@ AsyncImagePipelineManager::ApplyAsyncImages(wr::WebRenderAPI* aApi)
    wr::BuiltDisplayList dl;
    wr::LayoutSize builderContentSize;
    builder.Finalize(builderContentSize, dl);
-    aApi->SetRootDisplayList(gfx::Color(0.f, 0.f, 0.f, 0.f), epoch, LayerSize(pipeline->mScBounds.width, pipeline->mScBounds.height),
+    mApi->SetRootDisplayList(gfx::Color(0.f, 0.f, 0.f, 0.f), epoch, LayerSize(pipeline->mScBounds.width, pipeline->mScBounds.height),
                             pipelineId, builderContentSize,
                             dl.dl_desc, dl.dl.inner.data, dl.dl.inner.length);
  }
-  DeleteOldAsyncImages(aApi);
+  DeleteOldAsyncImages();
  mKeysToDelete.SwapElements(keysToDelete);
 }

--- a/gfx/layers/wr/AsyncImagePipelineManager.h
+++ b/gfx/layers/wr/AsyncImagePipelineManager.h
@ -12,6 +12,7 @@
 #include "mozilla/gfx/Point.h"
 #include "mozilla/layers/TextureHost.h"
 #include "mozilla/Maybe.h"
+#include "mozilla/webrender/WebRenderAPI.h"
 #include "mozilla/webrender/WebRenderTypes.h"
 #include "nsClassHashtable.h"

@ -34,13 +35,13 @@ class AsyncImagePipelineManager final
 public:
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(AsyncImagePipelineManager)

-  explicit AsyncImagePipelineManager(wr::IdNamespace aIdNamespace);
+  explicit AsyncImagePipelineManager(already_AddRefed<wr::WebRenderAPI>&& aApi);

 protected:
  ~AsyncImagePipelineManager();

 public:
-  void Destroy(wr::WebRenderAPI* aApi);
+  void Destroy();
  bool HasKeysToDelete();

  void AddPipeline(const wr::PipelineId& aPipelineId);
@ -70,7 +71,7 @@ public:
  }

  void AddAsyncImagePipeline(const wr::PipelineId& aPipelineId, WebRenderImageHost* aImageHost);
-  void RemoveAsyncImagePipeline(wr::WebRenderAPI* aApi, const wr::PipelineId& aPipelineId);
+  void RemoveAsyncImagePipeline(const wr::PipelineId& aPipelineId);

  void UpdateAsyncImagePipeline(const wr::PipelineId& aPipelineId,
                                const LayerRect& aScBounds,
@ -78,7 +79,7 @@ public:
                                const gfx::MaybeIntSize& aScaleToSize,
                                const wr::ImageRendering& aFilter,
                                const wr::MixBlendMode& aMixBlendMode);
-  void ApplyAsyncImages(wr::WebRenderAPI* aApi);
+  void ApplyAsyncImages();

  void AppendImageCompositeNotification(const ImageCompositeNotificationInfo& aNotification)
  {
@ -91,7 +92,7 @@ public:
  }

 private:
-  void DeleteOldAsyncImages(wr::WebRenderAPI* aApi);
+  void DeleteOldAsyncImages();

  uint32_t GetNextResourceId() { return ++mResourceId; }
  wr::IdNamespace GetNamespace() { return mIdNamespace; }
@ -102,7 +103,7 @@ private:
    key.mHandle = GetNextResourceId();
    return key;
  }
-  bool GenerateImageKeyForTextureHost(wr::WebRenderAPI* aApi, TextureHost* aTexture, nsTArray<wr::ImageKey>& aKeys);
+  bool GenerateImageKeyForTextureHost(TextureHost* aTexture, nsTArray<wr::ImageKey>& aKeys);

  struct ForwardingTextureHost {
    ForwardingTextureHost(const wr::Epoch& aEpoch, TextureHost* aTexture)
@ -135,12 +136,12 @@ private:
    nsTArray<wr::ImageKey> mKeys;
  };

-  bool UpdateImageKeys(wr::WebRenderAPI* aApi,
-                       bool& aUseExternalImage,
+  bool UpdateImageKeys(bool& aUseExternalImage,
                       AsyncImagePipeline* aImageMgr,
                       nsTArray<wr::ImageKey>& aKeys,
                       nsTArray<wr::ImageKey>& aKeysToDelete);

+  RefPtr<wr::WebRenderAPI> mApi;
  wr::IdNamespace mIdNamespace;
  uint32_t mResourceId;

--- a/gfx/layers/wr/ScrollingLayersHelper.cpp
+++ b/gfx/layers/wr/ScrollingLayersHelper.cpp
@ -21,6 +21,7 @@ ScrollingLayersHelper::ScrollingLayersHelper(WebRenderLayer* aLayer,
  : mLayer(aLayer)
  , mBuilder(&aBuilder)
  , mPushedLayerLocalClip(false)
+  , mClipsPushed(0)
 {
  if (!mLayer->WrManager()->AsyncPanZoomEnabled()) {
    // If APZ is disabled then we don't need to push the scrolling clips. We
@ -107,6 +108,60 @@ ScrollingLayersHelper::ScrollingLayersHelper(WebRenderLayer* aLayer,
  }
 }

+ScrollingLayersHelper::ScrollingLayersHelper(nsDisplayItem* aItem,
+                                             wr::DisplayListBuilder& aBuilder,
+                                             const StackingContextHelper& aStackingContext,
+                                             WebRenderLayerManager::ClipIdMap& aCache)
+  : mLayer(nullptr)
+  , mBuilder(&aBuilder)
+  , mPushedLayerLocalClip(false)
+  , mClipsPushed(0)
+{
+  DefineAndPushChain(aItem->GetClipChain(), aBuilder, aStackingContext,
+      aItem->Frame()->PresContext()->AppUnitsPerDevPixel(), aCache);
+}
+
+void
+ScrollingLayersHelper::DefineAndPushChain(const DisplayItemClipChain* aChain,
+                                          wr::DisplayListBuilder& aBuilder,
+                                          const StackingContextHelper& aStackingContext,
+                                          int32_t aAppUnitsPerDevPixel,
+                                          WebRenderLayerManager::ClipIdMap& aCache)
+{
+  if (!aChain) {
+    return;
+  }
+  auto it = aCache.find(aChain);
+  Maybe<wr::WrClipId> clipId = (it != aCache.end() ? Some(it->second) : Nothing());
+  if (clipId && clipId == aBuilder.TopmostClipId()) {
+    // it was already in the cache and pushed on the WR clip stack, so we don't
+    // need to recurse any further.
+    return;
+  }
+  // Recurse up the clip chain to make sure all ancestor clips are defined and
+  // pushed onto the WR clip stack. Note that the recursion can invalidate the
+  // iterator `it`.
+  DefineAndPushChain(aChain->mParent, aBuilder, aStackingContext, aAppUnitsPerDevPixel, aCache);
+
+  if (!aChain->mClip.HasClip()) {
+    // This item in the chain is a no-op, skip over it
+    return;
+  }
+  if (!clipId) {
+    // If we don't have a clip id for this chain item yet, define the clip in WR
+    // and save the id
+    LayoutDeviceRect clip = LayoutDeviceRect::FromAppUnits(
+        aChain->mClip.GetClipRect(), aAppUnitsPerDevPixel);
+    // TODO: deal with rounded corners here
+    clipId = Some(aBuilder.DefineClip(aStackingContext.ToRelativeLayoutRect(clip)));
+    aCache[aChain] = clipId.value();
+  }
+  // Finally, push the clip onto the WR stack
+  MOZ_ASSERT(clipId);
+  aBuilder.PushClip(clipId.value());
+  mClipsPushed++;
+}
+
 void
 ScrollingLayersHelper::PushLayerLocalClip(const StackingContextHelper& aStackingContext)
 {
@ -123,7 +178,8 @@ ScrollingLayersHelper::PushLayerLocalClip(const StackingContextHelper& aStacking
    Maybe<wr::WrImageMask> mask = mLayer->BuildWrMaskLayer(aStackingContext);
    LayerRect clipRect = ViewAs<LayerPixel>(clip.ref(),
        PixelCastJustification::MovingDownToChildren);
-    mBuilder->PushClip(aStackingContext.ToRelativeLayoutRect(clipRect), mask.ptrOr(nullptr));
+    mBuilder->PushClip(mBuilder->DefineClip(
+        aStackingContext.ToRelativeLayoutRect(clipRect), nullptr, mask.ptrOr(nullptr)));
    mPushedLayerLocalClip = true;
  }
 }
@ -141,11 +197,21 @@ ScrollingLayersHelper::PushLayerClip(const LayerClip& aClip,
    // TODO: check this transform is correct in all cases
    mask = maskWrLayer->RenderMaskLayer(aSc, maskLayer->GetTransform());
  }
-  mBuilder->PushClip(aSc.ToRelativeLayoutRect(clipRect), mask.ptrOr(nullptr));
+  mBuilder->PushClip(mBuilder->DefineClip(
+      aSc.ToRelativeLayoutRect(clipRect), nullptr, mask.ptrOr(nullptr)));
 }

 ScrollingLayersHelper::~ScrollingLayersHelper()
 {
+  if (!mLayer) {
+    // For layers-free mode
+    while (mClipsPushed > 0) {
+      mBuilder->PopClip();
+      mClipsPushed--;
+    }
+    return;
+  }
+
  Layer* layer = mLayer->GetLayer();
  if (!mLayer->WrManager()->AsyncPanZoomEnabled()) {
    if (mPushedLayerLocalClip) {
--- a/gfx/layers/wr/ScrollingLayersHelper.h
+++ b/gfx/layers/wr/ScrollingLayersHelper.h
@ -7,9 +7,12 @@
 #define GFX_SCROLLINGLAYERSHELPER_H

 #include "mozilla/Attributes.h"
+#include "mozilla/layers/WebRenderLayerManager.h"

 namespace mozilla {

+struct DisplayItemClipChain;
+
 namespace wr {
 class DisplayListBuilder;
 }
@ -26,9 +29,18 @@ public:
  ScrollingLayersHelper(WebRenderLayer* aLayer,
                        wr::DisplayListBuilder& aBuilder,
                        const StackingContextHelper& aSc);
+  ScrollingLayersHelper(nsDisplayItem* aItem,
+                        wr::DisplayListBuilder& aBuilder,
+                        const StackingContextHelper& aStackingContext,
+                        WebRenderLayerManager::ClipIdMap& aCache);
  ~ScrollingLayersHelper();

 private:
+  void DefineAndPushChain(const DisplayItemClipChain* aChain,
+                          wr::DisplayListBuilder& aBuilder,
+                          const StackingContextHelper& aStackingContext,
+                          int32_t aAppUnitsPerDevPixel,
+                          WebRenderLayerManager::ClipIdMap& aCache);
  void PushLayerLocalClip(const StackingContextHelper& aStackingContext);
  void PushLayerClip(const LayerClip& aClip,
                     const StackingContextHelper& aSc);
@ -36,6 +48,7 @@ private:
  WebRenderLayer* mLayer;
  wr::DisplayListBuilder* mBuilder;
  bool mPushedLayerLocalClip;
+  int mClipsPushed;
 };

 } // namespace layers
--- a/gfx/layers/wr/WebRenderBridgeParent.cpp
+++ b/gfx/layers/wr/WebRenderBridgeParent.cpp
@ -112,8 +112,6 @@ private:
  InfallibleTArray<OpDestroy>* mActorsToDestroy;
 };

-/* static */ uint32_t WebRenderBridgeParent::sIdNameSpace = 0;
-
 WebRenderBridgeParent::WebRenderBridgeParent(CompositorBridgeParentBase* aCompositorBridge,
                                             const wr::PipelineId& aPipelineId,
                                             widget::CompositorWidget* aWidget,
@ -131,7 +129,7 @@ WebRenderBridgeParent::WebRenderBridgeParent(CompositorBridgeParentBase* aCompos
  , mChildLayerObserverEpoch(0)
  , mParentLayerObserverEpoch(0)
  , mWrEpoch(0)
-  , mIdNamespace(AllocIdNameSpace())
+  , mIdNamespace(aApi->GetNamespace())
  , mPaused(false)
  , mDestroyed(false)
  , mForceRendering(false)
@ -150,7 +148,7 @@ WebRenderBridgeParent::WebRenderBridgeParent()
  , mChildLayerObserverEpoch(0)
  , mParentLayerObserverEpoch(0)
  , mWrEpoch(0)
-  , mIdNamespace(AllocIdNameSpace())
+  , mIdNamespace{0}
  , mPaused(false)
  , mDestroyed(true)
  , mForceRendering(false)
@ -794,7 +792,7 @@ WebRenderBridgeParent::RecvRemovePipelineIdForCompositable(const wr::PipelineId&
  }

  wrHost->ClearWrBridge();
-  mAsyncImageManager->RemoveAsyncImagePipeline(mApi, aPipelineId);
+  mAsyncImageManager->RemoveAsyncImagePipeline(aPipelineId);
  mAsyncCompositables.Remove(wr::AsUint64(aPipelineId));
  return IPC_OK();
 }
@ -886,7 +884,7 @@ WebRenderBridgeParent::UpdateWebRender(CompositorVsyncScheduler* aScheduler,

  // Update id name space to identify obsoleted keys.
  // Since usage of invalid keys could cause crash in webrender.
-  mIdNamespace = AllocIdNameSpace();
+  mIdNamespace = aApi->GetNamespace();
  // XXX Remove it when webrender supports sharing/moving Keys between different webrender instances.
  // XXX It requests client to update/reallocate webrender related resources,
  // but parent side does not wait end of the update.
@ -1118,7 +1116,7 @@ WebRenderBridgeParent::CompositeToTarget(gfx::DrawTarget* aTarget, const gfx::In
  nsTArray<wr::WrTransformProperty> transformArray;

  mAsyncImageManager->SetCompositionTime(TimeStamp::Now());
-  mAsyncImageManager->ApplyAsyncImages(mApi);
+  mAsyncImageManager->ApplyAsyncImages();

  SampleAnimations(opacityArray, transformArray);
  if (!transformArray.IsEmpty() || !opacityArray.IsEmpty()) {
@ -1315,7 +1313,7 @@ WebRenderBridgeParent::ClearResources()
    wr::PipelineId pipelineId = wr::AsPipelineId(iter.Key());
    RefPtr<WebRenderImageHost> host = iter.Data();
    host->ClearWrBridge();
-    mAsyncImageManager->RemoveAsyncImagePipeline(mApi, pipelineId);
+    mAsyncImageManager->RemoveAsyncImagePipeline(pipelineId);
  }
  mAsyncCompositables.Clear();

@ -1331,6 +1329,7 @@ WebRenderBridgeParent::ClearResources()
  }
  mAnimStorage = nullptr;
  mCompositorScheduler = nullptr;
+  mAsyncImageManager = nullptr;
  mApi = nullptr;
  mCompositorBridge = nullptr;
 }
@ -1454,6 +1453,9 @@ void
 WebRenderBridgeParent::ExtractImageCompositeNotifications(nsTArray<ImageCompositeNotificationInfo>* aNotifications)
 {
  MOZ_ASSERT(mWidget);
+  if (mDestroyed) {
+    return;
+  }
  mAsyncImageManager->FlushImageNotifications(aNotifications);
 }

--- a/gfx/layers/wr/WebRenderBridgeParent.h
+++ b/gfx/layers/wr/WebRenderBridgeParent.h
@ -187,10 +187,6 @@ public:
  void UpdateAPZ();
  const WebRenderScrollData& GetScrollData() const;

-  static wr::IdNamespace AllocIdNameSpace() {
-    return wr::IdNamespace { ++sIdNameSpace };
-  }
-
  void FlushRendering(bool aIsSync);

  void ScheduleComposition();
@ -296,8 +292,6 @@ private:

  // Can only be accessed on the compositor thread.
  WebRenderScrollData mScrollData;
-
-  static uint32_t sIdNameSpace;
 };

 } // namespace layers
--- a/gfx/layers/wr/WebRenderLayerManager.cpp
+++ b/gfx/layers/wr/WebRenderLayerManager.cpp
@ -264,11 +264,15 @@ WebRenderLayerManager::CreateWebRenderCommandsFromDisplayList(nsDisplayList* aDi
      }
    }

-    // Note: this call to CreateWebRenderCommands can recurse back into
-    // this function if the |item| is a wrapper for a sublist.
-    if (!item->CreateWebRenderCommands(aBuilder, aSc, mParentCommands, this,
-                                       aDisplayListBuilder)) {
-      PushItemAsImage(item, aBuilder, aSc, aDisplayListBuilder);
+    { // scope the ScrollingLayersHelper
+      ScrollingLayersHelper clip(item, aBuilder, aSc, mClipIdCache);
+
+      // Note: this call to CreateWebRenderCommands can recurse back into
+      // this function if the |item| is a wrapper for a sublist.
+      if (!item->CreateWebRenderCommands(aBuilder, aSc, mParentCommands, this,
+                                         aDisplayListBuilder)) {
+        PushItemAsImage(item, aBuilder, aSc, aDisplayListBuilder);
+      }
    }

    if (apzEnabled && forceNewLayerData) {
@ -624,6 +628,7 @@ WebRenderLayerManager::EndTransactionInternal(DrawPaintedLayerCallback aCallback
        mScrollData.AddLayerData(*i);
      }
      mLayerScrollData.clear();
+      mClipIdCache.clear();
    } else {
      for (auto iter = mLastCanvasDatas.Iter(); !iter.Done(); iter.Next()) {
        RefPtr<WebRenderCanvasData> canvasData = iter.Get()->GetKey();
--- a/gfx/layers/wr/WebRenderLayerManager.h
+++ b/gfx/layers/wr/WebRenderLayerManager.h
@ -273,6 +273,21 @@ private:
  // tree don't duplicate scroll metadata that their ancestors already have.
  std::vector<const ActiveScrolledRoot*> mAsrStack;

+public:
+  // Note: two DisplayItemClipChain* A and B might actually be "equal" (as per
+  // DisplayItemClipChain::Equal(A, B)) even though they are not the same pointer
+  // (A != B). In this hopefully-rare case, they will get separate entries
+  // in this map when in fact we could collapse them. However, to collapse
+  // them involves writing a custom hash function for the pointer type such that
+  // A and B hash to the same things whenever DisplayItemClipChain::Equal(A, B)
+  // is true, and that will incur a performance penalty for all the hashmap
+  // operations, so is probably not worth it. With the current code we might
+  // end up creating multiple clips in WR that are effectively identical but
+  // have separate clip ids. Hopefully this won't happen very often.
+  typedef std::unordered_map<const DisplayItemClipChain*, wr::WrClipId> ClipIdMap;
+private:
+  ClipIdMap mClipIdCache;
+
  // Layers that have been mutated. If we have an empty transaction
  // then a display item layer will no longer be valid
  // if it was a mutated layers.
--- a/Show More
+++ b/Show More