diff --git a/testing/marionette/client/marionette/emulator.py b/testing/marionette/client/marionette/emulator.py
index 396082b417e1..c94ad14b2a44 100644
--- a/testing/marionette/client/marionette/emulator.py
+++ b/testing/marionette/client/marionette/emulator.py
@@ -306,6 +306,9 @@ class Emulator(object):
             online, offline = self._get_adb_devices()
         self.port = int(list(online - original_online)[0])
         self._emulator_launched = True
+
+        # bug 802877
+        time.sleep(10)
         self.geo.set_default_location()
 
         if self.logcat_dir:
diff --git a/testing/marionette/client/marionette/marionette_test.py b/testing/marionette/client/marionette/marionette_test.py
index bdc07a84fb95..6e21ab7a0548 100644
--- a/testing/marionette/client/marionette/marionette_test.py
+++ b/testing/marionette/client/marionette/marionette_test.py
@@ -159,6 +159,17 @@ class MarionetteJSTestCase(CommonTestCase):
         if self.marionette.session is None:
             self.marionette.start_session()
         self.marionette.execute_script("log('TEST-START: %s');" % self.jsFile.replace('\\', '\\\\'))
+
+        self.marionette.set_context(self.marionette.CONTEXT_CHROME)
+        self.marionette.set_script_timeout(30000)
+        self.marionette.execute_async_script("""
+waitFor(
+    function() { marionetteScriptFinished(true); },
+    function() { return isSystemMessageListenerReady(); }
+);
+            """)
+        self.marionette.set_context(self.marionette.CONTEXT_CONTENT)
+
         f = open(self.jsFile, 'r')
         js = f.read()
         args = []
diff --git a/testing/marionette/marionette-actors.js b/testing/marionette/marionette-actors.js
index 14bb36cd64ed..7b2953f1a5e9 100644
--- a/testing/marionette/marionette-actors.js
+++ b/testing/marionette/marionette-actors.js
@@ -449,8 +449,7 @@ MarionetteDriverActor.prototype = {
       let win = this.getCurrentWindow();
       if (!win ||
           (appName == "Firefox" && !win.gBrowser) ||
-          (appName == "Fennec" && !win.BrowserApp) ||
-          (appName == "B2G" && !systemMessageListenerReady)) { 
+          (appName == "Fennec" && !win.BrowserApp)) { 
         checkTimer.initWithCallback(waitForWindow.bind(this), 100, Ci.nsITimer.TYPE_ONE_SHOT);
       }
       else {
@@ -606,6 +605,9 @@ MarionetteDriverActor.prototype = {
       }
     });
 
+    _chromeSandbox.isSystemMessageListenerReady =
+        function() { return systemMessageListenerReady; }
+
     if (specialPowers == true) {
       loader.loadSubScript("chrome://specialpowers/content/specialpowersAPI.js",
                            _chromeSandbox);
diff --git a/testing/mochitest/b2g.json b/testing/mochitest/b2g.json
new file mode 100644
index 000000000000..cf7db60a0a04
--- /dev/null
+++ b/testing/mochitest/b2g.json
@@ -0,0 +1,9 @@
+{
+"runtests": {
+    "dom/tests/mochitest/dom-level0": "",
+    "dom/tests/mochitest/dom-level1-core": "",
+    "dom/tests/mochitest/dom-level2-core": "",
+    "dom/tests/mochitest/dom-level2-html": ""
+  },
+"excludetests": {}
+}
diff --git a/widget/cocoa/nsChildView.mm b/widget/cocoa/nsChildView.mm
index f8c97fc301aa..13f1421edc21 100644
--- a/widget/cocoa/nsChildView.mm
+++ b/widget/cocoa/nsChildView.mm
@@ -32,6 +32,7 @@
 #include "nsNPAPIPluginInstance.h"
 #include "nsThemeConstants.h"
 #include "nsIWidgetListener.h"
+#include "nsIPresShell.h"
 
 #include "nsDragService.h"
 #include "nsClipboard.h"