diff --git a/browser/base/content/test/captivePortal/browser_CaptivePortalWatcher.js b/browser/base/content/test/captivePortal/browser_CaptivePortalWatcher.js
index 425289e3d406..8290571b3f19 100644
--- a/browser/base/content/test/captivePortal/browser_CaptivePortalWatcher.js
+++ b/browser/base/content/test/captivePortal/browser_CaptivePortalWatcher.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 // Bug 1318389 - This test does a lot of window and tab manipulation,
diff --git a/browser/base/content/test/forms/browser_selectpopup.js b/browser/base/content/test/forms/browser_selectpopup.js
index dc3384b06d6f..ec2a1347b36b 100644
--- a/browser/base/content/test/forms/browser_selectpopup.js
+++ b/browser/base/content/test/forms/browser_selectpopup.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 // This test tests <select> in a child process. This is different than
 // single-process as a <menulist> is used to implement the dropdown list.
diff --git a/browser/base/content/test/general/browser_audioTabIcon.js b/browser/base/content/test/general/browser_audioTabIcon.js
index 4a59b0e3b989..084658e4d7e5 100644
--- a/browser/base/content/test/general/browser_audioTabIcon.js
+++ b/browser/base/content/test/general/browser_audioTabIcon.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 const PAGE = "https://example.com/browser/browser/base/content/test/general/file_mediaPlayback.html";
 const TABATTR_REMOVAL_PREFNAME = "browser.tabs.delayHidingAudioPlayingIconMS";
 const INITIAL_TABATTR_REMOVAL_DELAY_MS = Services.prefs.getIntPref(TABATTR_REMOVAL_PREFNAME);
diff --git a/browser/base/content/test/general/browser_bookmark_popup.js b/browser/base/content/test/general/browser_bookmark_popup.js
index 999414d72d05..7777eb84ac20 100644
--- a/browser/base/content/test/general/browser_bookmark_popup.js
+++ b/browser/base/content/test/general/browser_bookmark_popup.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/browser/base/content/test/general/browser_bug432599.js b/browser/base/content/test/general/browser_bug432599.js
index fdb407e24ff0..5a828d4b73f4 100644
--- a/browser/base/content/test/general/browser_bug432599.js
+++ b/browser/base/content/test/general/browser_bug432599.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 function invokeUsingCtrlD(phase) {
   switch (phase) {
   case 1:
diff --git a/browser/base/content/test/general/browser_domFullscreen_fullscreenMode.js b/browser/base/content/test/general/browser_domFullscreen_fullscreenMode.js
index 811931f4ceec..05859ba3ed45 100644
--- a/browser/base/content/test/general/browser_domFullscreen_fullscreenMode.js
+++ b/browser/base/content/test/general/browser_domFullscreen_fullscreenMode.js
@@ -1,4 +1,5 @@
 /* eslint-env mozilla/frame-script */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/browser/base/content/test/general/browser_double_close_tab.js b/browser/base/content/test/general/browser_double_close_tab.js
index 56329bb4bc29..a8d8eca585d8 100644
--- a/browser/base/content/test/general/browser_double_close_tab.js
+++ b/browser/base/content/test/general/browser_double_close_tab.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 const TEST_PAGE = "http://mochi.test:8888/browser/browser/base/content/test/general/file_double_close_tab.html";
 var testTab;
diff --git a/browser/base/content/test/general/browser_fullscreen-window-open.js b/browser/base/content/test/general/browser_fullscreen-window-open.js
index 7223245c764f..10457a698849 100644
--- a/browser/base/content/test/general/browser_fullscreen-window-open.js
+++ b/browser/base/content/test/general/browser_fullscreen-window-open.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
 Components.utils.import("resource://gre/modules/Services.jsm");
 
diff --git a/browser/base/content/test/general/browser_lastAccessedTab.js b/browser/base/content/test/general/browser_lastAccessedTab.js
index c243f2748213..6bda4be9060b 100644
--- a/browser/base/content/test/general/browser_lastAccessedTab.js
+++ b/browser/base/content/test/general/browser_lastAccessedTab.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 // gBrowser.selectedTab.lastAccessed and Date.now() called from this test can't
 // run concurrently, and therefore don't always match exactly.
diff --git a/browser/base/content/test/general/browser_plainTextLinks.js b/browser/base/content/test/general/browser_plainTextLinks.js
index c49d7493b9f7..351b064100ce 100644
--- a/browser/base/content/test/general/browser_plainTextLinks.js
+++ b/browser/base/content/test/general/browser_plainTextLinks.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 function testExpected(expected, msg) {
   is(document.getElementById("context-openlinkincurrent").hidden, expected, msg);
 }
diff --git a/browser/base/content/test/general/browser_star_hsts.js b/browser/base/content/test/general/browser_star_hsts.js
index c25bc522a64d..90ce54a6df8f 100644
--- a/browser/base/content/test/general/browser_star_hsts.js
+++ b/browser/base/content/test/general/browser_star_hsts.js
@@ -1,6 +1,7 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 var secureURL = "https://example.com/browser/browser/base/content/test/general/browser_star_hsts.sjs";
 var unsecureURL = "http://example.com/browser/browser/base/content/test/general/browser_star_hsts.sjs";
diff --git a/browser/base/content/test/general/browser_storagePressure_notification.js b/browser/base/content/test/general/browser_storagePressure_notification.js
index 3b8d042f38b4..aefc9002d927 100644
--- a/browser/base/content/test/general/browser_storagePressure_notification.js
+++ b/browser/base/content/test/general/browser_storagePressure_notification.js
@@ -1,6 +1,7 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 function notifyStoragePressure(usage = 100) {
   let notifyPromise = TestUtils.topicObserved("QuotaManager::StoragePressure", () => true);
diff --git a/browser/base/content/test/general/browser_tabs_isActive.js b/browser/base/content/test/general/browser_tabs_isActive.js
index fbd25b5c8942..94e1d7bd509c 100644
--- a/browser/base/content/test/general/browser_tabs_isActive.js
+++ b/browser/base/content/test/general/browser_tabs_isActive.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 // Test for the docshell active state of local and remote browsers.
 
diff --git a/browser/base/content/test/newtab/browser_newtab_reflow_load.js b/browser/base/content/test/newtab/browser_newtab_reflow_load.js
index fe869650e100..999d2b2a9c4c 100644
--- a/browser/base/content/test/newtab/browser_newtab_reflow_load.js
+++ b/browser/base/content/test/newtab/browser_newtab_reflow_load.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/browser/base/content/test/permissions/browser_temporary_permissions_expiry.js b/browser/base/content/test/permissions/browser_temporary_permissions_expiry.js
index 713b0a9840bc..93f9578ac3b4 100644
--- a/browser/base/content/test/permissions/browser_temporary_permissions_expiry.js
+++ b/browser/base/content/test/permissions/browser_temporary_permissions_expiry.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/browser/base/content/test/popupNotifications/browser_popupNotification_3.js b/browser/base/content/test/popupNotifications/browser_popupNotification_3.js
index 9a0d6fc25742..f5936dc9a55e 100644
--- a/browser/base/content/test/popupNotifications/browser_popupNotification_3.js
+++ b/browser/base/content/test/popupNotifications/browser_popupNotification_3.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 function test() {
   waitForExplicitFinish();
diff --git a/browser/base/content/test/sidebar/browser_bug409481.js b/browser/base/content/test/sidebar/browser_bug409481.js
index a1088fafda9e..7c93b494427f 100644
--- a/browser/base/content/test/sidebar/browser_bug409481.js
+++ b/browser/base/content/test/sidebar/browser_bug409481.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 function test() {
   waitForExplicitFinish();
 
diff --git a/browser/base/content/test/urlbar/browser_urlbarAddonIframe.js b/browser/base/content/test/urlbar/browser_urlbarAddonIframe.js
index 06faab37dc4e..425abba9f9ff 100644
--- a/browser/base/content/test/urlbar/browser_urlbarAddonIframe.js
+++ b/browser/base/content/test/urlbar/browser_urlbarAddonIframe.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 // The purpose of this test is to test the urlbar popup's add-on iframe.  It has
diff --git a/browser/base/content/test/urlbar/browser_urlbarSearchSingleWordNotification.js b/browser/base/content/test/urlbar/browser_urlbarSearchSingleWordNotification.js
index fdb892460711..8bc0a27c6fda 100644
--- a/browser/base/content/test/urlbar/browser_urlbarSearchSingleWordNotification.js
+++ b/browser/base/content/test/urlbar/browser_urlbarSearchSingleWordNotification.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 var notificationObserver;
diff --git a/browser/base/content/test/urlbar/browser_urlbar_stop_pending.js b/browser/base/content/test/urlbar/browser_urlbar_stop_pending.js
index 696f9ddcddee..7f9187bd11b8 100644
--- a/browser/base/content/test/urlbar/browser_urlbar_stop_pending.js
+++ b/browser/base/content/test/urlbar/browser_urlbar_stop_pending.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 const SLOW_PAGE = "http://www.example.com/browser/browser/base/content/test/urlbar/slow-page.sjs";
diff --git a/browser/base/content/test/webextensions/browser_extension_sideloading.js b/browser/base/content/test/webextensions/browser_extension_sideloading.js
index d8579809046c..84f4b3283a24 100644
--- a/browser/base/content/test/webextensions/browser_extension_sideloading.js
+++ b/browser/base/content/test/webextensions/browser_extension_sideloading.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 const {AddonManagerPrivate} = Cu.import("resource://gre/modules/AddonManager.jsm", {});
 
 const {AddonTestUtils} = Cu.import("resource://testing-common/AddonTestUtils.jsm", {});
diff --git a/browser/components/customizableui/test/browser_1087303_button_fullscreen.js b/browser/components/customizableui/test/browser_1087303_button_fullscreen.js
index 3902480e024d..64aa9ec6f6c3 100644
--- a/browser/components/customizableui/test/browser_1087303_button_fullscreen.js
+++ b/browser/components/customizableui/test/browser_1087303_button_fullscreen.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/browser/components/customizableui/test/browser_1087303_button_preferences.js b/browser/components/customizableui/test/browser_1087303_button_preferences.js
index 533e28d5c1ea..4b96a0c12981 100644
--- a/browser/components/customizableui/test/browser_1087303_button_preferences.js
+++ b/browser/components/customizableui/test/browser_1087303_button_preferences.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/browser/components/customizableui/test/browser_934951_zoom_in_toolbar.js b/browser/components/customizableui/test/browser_934951_zoom_in_toolbar.js
index 76c3a19d94de..401aa2096ce5 100644
--- a/browser/components/customizableui/test/browser_934951_zoom_in_toolbar.js
+++ b/browser/components/customizableui/test/browser_934951_zoom_in_toolbar.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/browser/components/customizableui/test/browser_981418-widget-onbeforecreated-handler.js b/browser/components/customizableui/test/browser_981418-widget-onbeforecreated-handler.js
index b5e9348862b7..14945e4bfdbb 100644
--- a/browser/components/customizableui/test/browser_981418-widget-onbeforecreated-handler.js
+++ b/browser/components/customizableui/test/browser_981418-widget-onbeforecreated-handler.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 const kWidgetId = "test-981418-widget-onbeforecreated";
diff --git a/browser/components/downloads/test/browser/browser_downloads_panel_block.js b/browser/components/downloads/test/browser/browser_downloads_panel_block.js
index d31e52a743e7..6e1954b54f7a 100644
--- a/browser/components/downloads/test/browser/browser_downloads_panel_block.js
+++ b/browser/components/downloads/test/browser/browser_downloads_panel_block.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 add_task(async function mainTest() {
diff --git a/browser/components/downloads/test/browser/browser_first_download_panel.js b/browser/components/downloads/test/browser/browser_first_download_panel.js
index 32e5e9f3beec..b3e33d10c315 100644
--- a/browser/components/downloads/test/browser/browser_first_download_panel.js
+++ b/browser/components/downloads/test/browser/browser_first_download_panel.js
@@ -2,6 +2,7 @@
 /* vim: set ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 /**
  * Make sure the downloads panel only opens automatically on the first
diff --git a/browser/components/extensions/test/browser/browser_ext_browserAction_popup_preload.js b/browser/components/extensions/test/browser/browser_ext_browserAction_popup_preload.js
index 7fdc9ae9259b..6c6bc6196ee7 100644
--- a/browser/components/extensions/test/browser/browser_ext_browserAction_popup_preload.js
+++ b/browser/components/extensions/test/browser/browser_ext_browserAction_popup_preload.js
@@ -1,5 +1,6 @@
 /* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
 /* vim: set sts=2 sw=2 et tw=80: */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 let scriptPage = url => `<html><head><meta charset="utf-8"><script src="${url}"></script></head><body>${url}</body></html>`;
diff --git a/browser/components/extensions/test/browser/browser_ext_browsingData_serviceWorkers.js b/browser/components/extensions/test/browser/browser_ext_browsingData_serviceWorkers.js
index effb1d80abb9..ff5b61d29f7b 100644
--- a/browser/components/extensions/test/browser/browser_ext_browsingData_serviceWorkers.js
+++ b/browser/components/extensions/test/browser/browser_ext_browsingData_serviceWorkers.js
@@ -1,5 +1,6 @@
 /* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
 /* vim: set sts=2 sw=2 et tw=80: */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 add_task(async function setup() {
diff --git a/browser/components/extensions/test/browser/browser_ext_popup_background.js b/browser/components/extensions/test/browser/browser_ext_popup_background.js
index 5335a0e21660..f89309ec4ff2 100644
--- a/browser/components/extensions/test/browser/browser_ext_popup_background.js
+++ b/browser/components/extensions/test/browser/browser_ext_popup_background.js
@@ -1,5 +1,6 @@
 /* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
 /* vim: set sts=2 sw=2 et tw=80: */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 add_task(async function testPopupBackground() {
diff --git a/browser/components/extensions/test/browser/browser_ext_popup_sendMessage.js b/browser/components/extensions/test/browser/browser_ext_popup_sendMessage.js
index 6ba01e59c110..8515888e357c 100644
--- a/browser/components/extensions/test/browser/browser_ext_popup_sendMessage.js
+++ b/browser/components/extensions/test/browser/browser_ext_popup_sendMessage.js
@@ -1,5 +1,6 @@
 /* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
 /* vim: set sts=2 sw=2 et tw=80: */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 add_task(async function test_popup_sendMessage_reply() {
diff --git a/browser/components/extensions/test/browser/browser_ext_tabs_onHighlighted.js b/browser/components/extensions/test/browser/browser_ext_tabs_onHighlighted.js
index a8d5ccfb8cf5..cf6add0b08bd 100644
--- a/browser/components/extensions/test/browser/browser_ext_tabs_onHighlighted.js
+++ b/browser/components/extensions/test/browser/browser_ext_tabs_onHighlighted.js
@@ -1,5 +1,6 @@
 /* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
 /* vim: set sts=2 sw=2 et tw=80: */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 add_task(async function testTabEvents() {
diff --git a/browser/components/extensions/test/browser/browser_ext_windows_size.js b/browser/components/extensions/test/browser/browser_ext_windows_size.js
index 816da115a672..f3795e82ad55 100644
--- a/browser/components/extensions/test/browser/browser_ext_windows_size.js
+++ b/browser/components/extensions/test/browser/browser_ext_windows_size.js
@@ -1,5 +1,6 @@
 /* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
 /* vim: set sts=2 sw=2 et tw=80: */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 add_task(async function testWindowCreate() {
diff --git a/browser/components/places/tests/browser/browser_views_iconsupdate.js b/browser/components/places/tests/browser/browser_views_iconsupdate.js
index f896d8768199..be60c6aadca1 100644
--- a/browser/components/places/tests/browser/browser_views_iconsupdate.js
+++ b/browser/components/places/tests/browser/browser_views_iconsupdate.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 /**
  * Tests Places views (toolbar, tree) for icons update.
diff --git a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_placesTitleNoUpdate.js b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_placesTitleNoUpdate.js
index 752001b344f8..da8af5a361d4 100644
--- a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_placesTitleNoUpdate.js
+++ b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_placesTitleNoUpdate.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 // Test to make sure that the visited page titles do not get updated inside the
 // private browsing mode.
diff --git a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_placestitle.js b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_placestitle.js
index 7b1f35ad9ead..47a928aa2f95 100644
--- a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_placestitle.js
+++ b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_placestitle.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 // This test makes sure that the title of existing history entries does not
 // change inside a private window.
diff --git a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_protocolhandler.js b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_protocolhandler.js
index 285f127c23f3..183afdc1a9d5 100644
--- a/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_protocolhandler.js
+++ b/browser/components/privatebrowsing/test/browser/browser_privatebrowsing_protocolhandler.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 // This test makes sure that the web pages can't register protocol handlers
 // inside the private browsing mode.
diff --git a/browser/components/search/test/browser_426329.js b/browser/components/search/test/browser_426329.js
index a957f5d91b0b..8bae02c87218 100644
--- a/browser/components/search/test/browser_426329.js
+++ b/browser/components/search/test/browser_426329.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 XPCOMUtils.defineLazyModuleGetter(this, "FormHistory",
   "resource://gre/modules/FormHistory.jsm");
 
diff --git a/browser/components/sessionstore/test/browser_459906.js b/browser/components/sessionstore/test/browser_459906.js
index a2b9de70fa7c..bf93cd8835c2 100644
--- a/browser/components/sessionstore/test/browser_459906.js
+++ b/browser/components/sessionstore/test/browser_459906.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 function test() {
   /** Test for Bug 459906 **/
diff --git a/browser/components/sessionstore/test/browser_506482.js b/browser/components/sessionstore/test/browser_506482.js
index ce2ed0129b85..c1a22c287f38 100644
--- a/browser/components/sessionstore/test/browser_506482.js
+++ b/browser/components/sessionstore/test/browser_506482.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 function test() {
   /** Test for Bug 506482 **/
diff --git a/browser/components/sessionstore/test/browser_705597.js b/browser/components/sessionstore/test/browser_705597.js
index 8f72ac8c5031..7feb56f2613e 100644
--- a/browser/components/sessionstore/test/browser_705597.js
+++ b/browser/components/sessionstore/test/browser_705597.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 var tabState = {
   entries: [{
diff --git a/browser/components/sessionstore/test/browser_707862.js b/browser/components/sessionstore/test/browser_707862.js
index 1338efabf871..3ec851400850 100644
--- a/browser/components/sessionstore/test/browser_707862.js
+++ b/browser/components/sessionstore/test/browser_707862.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 var tabState = {
   entries: [{
diff --git a/browser/components/sessionstore/test/browser_frame_history.js b/browser/components/sessionstore/test/browser_frame_history.js
index 4c51f21bc246..49ac35c457d8 100644
--- a/browser/components/sessionstore/test/browser_frame_history.js
+++ b/browser/components/sessionstore/test/browser_frame_history.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 /**
  Ensure that frameset history works properly when restoring a tab,
diff --git a/browser/components/sessionstore/test/browser_send_async_message_oom.js b/browser/components/sessionstore/test/browser_send_async_message_oom.js
index 7933840612dc..14a3d1a208ed 100644
--- a/browser/components/sessionstore/test/browser_send_async_message_oom.js
+++ b/browser/components/sessionstore/test/browser_send_async_message_oom.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 const {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
 
diff --git a/browser/components/sessionstore/test/browser_undoCloseById.js b/browser/components/sessionstore/test/browser_undoCloseById.js
index ee7197617f48..19b862131d69 100644
--- a/browser/components/sessionstore/test/browser_undoCloseById.js
+++ b/browser/components/sessionstore/test/browser_undoCloseById.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 /**
diff --git a/browser/components/shell/test/browser_1119088.js b/browser/components/shell/test/browser_1119088.js
index 2d615e76403e..ed70cdb5b7a9 100644
--- a/browser/components/shell/test/browser_1119088.js
+++ b/browser/components/shell/test/browser_1119088.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 let NS_OSX_PICTURE_DOCUMENTS_DIR = "Pct";
 let NS_MAC_USER_LIB_DIR = "ULibDir";
 
diff --git a/browser/extensions/formautofill/test/browser/browser_first_time_use_doorhanger.js b/browser/extensions/formautofill/test/browser/browser_first_time_use_doorhanger.js
index 531ac172c0c3..f24bd17bf912 100644
--- a/browser/extensions/formautofill/test/browser/browser_first_time_use_doorhanger.js
+++ b/browser/extensions/formautofill/test/browser/browser_first_time_use_doorhanger.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 const FORM_URL = "http://mochi.test:8888/browser/browser/extensions/formautofill/test/browser/autocomplete_basic.html";
diff --git a/browser/extensions/formautofill/test/browser/browser_submission_in_private_mode.js b/browser/extensions/formautofill/test/browser/browser_submission_in_private_mode.js
index 23af36757012..3eb20c2b6414 100644
--- a/browser/extensions/formautofill/test/browser/browser_submission_in_private_mode.js
+++ b/browser/extensions/formautofill/test/browser/browser_submission_in_private_mode.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 const FORM_URL = "http://mochi.test:8888/browser/browser/extensions/formautofill/test/browser/autocomplete_basic.html";
diff --git a/browser/extensions/formautofill/test/browser/browser_update_doorhanger.js b/browser/extensions/formautofill/test/browser/browser_update_doorhanger.js
index 8c951d6ea422..3077d7461198 100644
--- a/browser/extensions/formautofill/test/browser/browser_update_doorhanger.js
+++ b/browser/extensions/formautofill/test/browser/browser_update_doorhanger.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 const FORM_URL = "http://mochi.test:8888/browser/browser/extensions/formautofill/test/browser/autocomplete_basic.html";
diff --git a/browser/extensions/pdfjs/test/browser_pdfjs_navigation.js b/browser/extensions/pdfjs/test/browser_pdfjs_navigation.js
index b6f907881310..b44e04ba0fe4 100644
--- a/browser/extensions/pdfjs/test/browser_pdfjs_navigation.js
+++ b/browser/extensions/pdfjs/test/browser_pdfjs_navigation.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 requestLongerTimeout(2);
 
diff --git a/browser/modules/test/browser/browser_PageActions.js b/browser/modules/test/browser/browser_PageActions.js
index f6f4f3df20da..7285f4ee23ac 100644
--- a/browser/modules/test/browser/browser_PageActions.js
+++ b/browser/modules/test/browser/browser_PageActions.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 // This is a test for PageActions.jsm, specifically the generalized parts that
diff --git a/browser/modules/test/browser/browser_SitePermissions_expiry.js b/browser/modules/test/browser/browser_SitePermissions_expiry.js
index 300169deca9e..256bec684d91 100644
--- a/browser/modules/test/browser/browser_SitePermissions_expiry.js
+++ b/browser/modules/test/browser/browser_SitePermissions_expiry.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/aboutdebugging/test/browser_addons_debug_webextension.js b/devtools/client/aboutdebugging/test/browser_addons_debug_webextension.js
index b2f64a3307b3..889f8237ece2 100644
--- a/devtools/client/aboutdebugging/test/browser_addons_debug_webextension.js
+++ b/devtools/client/aboutdebugging/test/browser_addons_debug_webextension.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 // Avoid test timeouts that can occur while waiting for the "addon-console-works" message.
diff --git a/devtools/client/aboutdebugging/test/browser_service_workers_timeout.js b/devtools/client/aboutdebugging/test/browser_service_workers_timeout.js
index 1e27aa473976..55fab5f41f12 100644
--- a/devtools/client/aboutdebugging/test/browser_service_workers_timeout.js
+++ b/devtools/client/aboutdebugging/test/browser_service_workers_timeout.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/animationinspector/test/browser_animation_timeline_currentTime.js b/devtools/client/animationinspector/test/browser_animation_timeline_currentTime.js
index d5caaff283f5..4a7d5bed1ce6 100644
--- a/devtools/client/animationinspector/test/browser_animation_timeline_currentTime.js
+++ b/devtools/client/animationinspector/test/browser_animation_timeline_currentTime.js
@@ -1,6 +1,7 @@
 /* vim: set ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
  http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/animationinspector/test/browser_animation_timeline_pause_button_02.js b/devtools/client/animationinspector/test/browser_animation_timeline_pause_button_02.js
index 1c440dd8815b..df0dae653b49 100644
--- a/devtools/client/animationinspector/test/browser_animation_timeline_pause_button_02.js
+++ b/devtools/client/animationinspector/test/browser_animation_timeline_pause_button_02.js
@@ -1,6 +1,7 @@
 /* vim: set ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
  http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/animationinspector/test/browser_animation_timeline_rewind_button.js b/devtools/client/animationinspector/test/browser_animation_timeline_rewind_button.js
index c4dcbd16108b..fddf509fabf1 100644
--- a/devtools/client/animationinspector/test/browser_animation_timeline_rewind_button.js
+++ b/devtools/client/animationinspector/test/browser_animation_timeline_rewind_button.js
@@ -1,6 +1,7 @@
 /* vim: set ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
  http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/animationinspector/test/browser_animation_timeline_scrubber_moves.js b/devtools/client/animationinspector/test/browser_animation_timeline_scrubber_moves.js
index 494c581a4cbc..bc936d6654c8 100644
--- a/devtools/client/animationinspector/test/browser_animation_timeline_scrubber_moves.js
+++ b/devtools/client/animationinspector/test/browser_animation_timeline_scrubber_moves.js
@@ -1,6 +1,7 @@
 /* vim: set ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
  http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/inspector/markup/test/browser_markup_load_01.js b/devtools/client/inspector/markup/test/browser_markup_load_01.js
index 9667a7a5700b..c0fe2be0c019 100644
--- a/devtools/client/inspector/markup/test/browser_markup_load_01.js
+++ b/devtools/client/inspector/markup/test/browser_markup_load_01.js
@@ -1,6 +1,7 @@
 /* vim: set ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
  http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/inspector/test/browser_inspector_highlighter-05.js b/devtools/client/inspector/test/browser_inspector_highlighter-05.js
index 70829ec542f8..479e596c8a09 100644
--- a/devtools/client/inspector/test/browser_inspector_highlighter-05.js
+++ b/devtools/client/inspector/test/browser_inspector_highlighter-05.js
@@ -1,6 +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/. */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/inspector/test/browser_inspector_highlighter-hover_01.js b/devtools/client/inspector/test/browser_inspector_highlighter-hover_01.js
index 74436c49618c..ba0e96728f82 100644
--- a/devtools/client/inspector/test/browser_inspector_highlighter-hover_01.js
+++ b/devtools/client/inspector/test/browser_inspector_highlighter-hover_01.js
@@ -1,6 +1,7 @@
 /* vim: set ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
  http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/shared/test/browser_flame-graph-05.js b/devtools/client/shared/test/browser_flame-graph-05.js
index 1b30489dc7d8..80e7df777a9a 100644
--- a/devtools/client/shared/test/browser_flame-graph-05.js
+++ b/devtools/client/shared/test/browser_flame-graph-05.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/shared/test/browser_poller.js b/devtools/client/shared/test/browser_poller.js
index 281d055ffbd0..bb21715e7670 100644
--- a/devtools/client/shared/test/browser_poller.js
+++ b/devtools/client/shared/test/browser_poller.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/shared/test/browser_telemetry_button_paintflashing.js b/devtools/client/shared/test/browser_telemetry_button_paintflashing.js
index 90eaa47f4a6c..20da52b424a7 100644
--- a/devtools/client/shared/test/browser_telemetry_button_paintflashing.js
+++ b/devtools/client/shared/test/browser_telemetry_button_paintflashing.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/shared/test/browser_telemetry_button_scratchpad.js b/devtools/client/shared/test/browser_telemetry_button_scratchpad.js
index 10b096ffa6de..94309f603943 100644
--- a/devtools/client/shared/test/browser_telemetry_button_scratchpad.js
+++ b/devtools/client/shared/test/browser_telemetry_button_scratchpad.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/shared/test/browser_telemetry_sidebar.js b/devtools/client/shared/test/browser_telemetry_sidebar.js
index 4701d30f24e8..021409f65f47 100644
--- a/devtools/client/shared/test/browser_telemetry_sidebar.js
+++ b/devtools/client/shared/test/browser_telemetry_sidebar.js
@@ -1,5 +1,6 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/client/styleeditor/test/browser_styleeditor_sourcemap_watching.js b/devtools/client/styleeditor/test/browser_styleeditor_sourcemap_watching.js
index 3c1604e95690..3c24e36805cc 100644
--- a/devtools/client/styleeditor/test/browser_styleeditor_sourcemap_watching.js
+++ b/devtools/client/styleeditor/test/browser_styleeditor_sourcemap_watching.js
@@ -1,6 +1,7 @@
 /* vim: set ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/server/tests/browser/browser_animation_getStateAfterFinished.js b/devtools/server/tests/browser/browser_animation_getStateAfterFinished.js
index dd33237c1326..84dfb6ec6a2a 100644
--- a/devtools/server/tests/browser/browser_animation_getStateAfterFinished.js
+++ b/devtools/server/tests/browser/browser_animation_getStateAfterFinished.js
@@ -1,6 +1,7 @@
 /* vim: set ft=javascript ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/server/tests/browser/browser_animation_keepFinished.js b/devtools/server/tests/browser/browser_animation_keepFinished.js
index a3240a5e049a..70f856d3c46e 100644
--- a/devtools/server/tests/browser/browser_animation_keepFinished.js
+++ b/devtools/server/tests/browser/browser_animation_keepFinished.js
@@ -1,6 +1,7 @@
 /* vim: set ft=javascript ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/server/tests/browser/browser_animation_updatedState.js b/devtools/server/tests/browser/browser_animation_updatedState.js
index 17d68e9e5626..49e72033532a 100644
--- a/devtools/server/tests/browser/browser_animation_updatedState.js
+++ b/devtools/server/tests/browser/browser_animation_updatedState.js
@@ -1,6 +1,7 @@
 /* vim: set ft=javascript ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/server/tests/browser/browser_timeline_actors.js b/devtools/server/tests/browser/browser_timeline_actors.js
index 35c8db92dafc..659467b84e93 100644
--- a/devtools/server/tests/browser/browser_timeline_actors.js
+++ b/devtools/server/tests/browser/browser_timeline_actors.js
@@ -1,6 +1,7 @@
 /* vim: set ft=javascript ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/devtools/server/tests/browser/browser_timeline_iframes.js b/devtools/server/tests/browser/browser_timeline_iframes.js
index 8b9c0c8c4dd0..d8317f7718fb 100644
--- a/devtools/server/tests/browser/browser_timeline_iframes.js
+++ b/devtools/server/tests/browser/browser_timeline_iframes.js
@@ -1,6 +1,7 @@
 /* vim: set ft=javascript ts=2 et sw=2 tw=80: */
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/toolkit/components/aboutperformance/tests/browser/browser_aboutperformance.js b/toolkit/components/aboutperformance/tests/browser/browser_aboutperformance.js
index eb9196e32722..7cd1ce98a7e6 100644
--- a/toolkit/components/aboutperformance/tests/browser/browser_aboutperformance.js
+++ b/toolkit/components/aboutperformance/tests/browser/browser_aboutperformance.js
@@ -2,6 +2,7 @@
  * http://creativecommons.org/publicdomain/zero/1.0/ */
 
 /* eslint-env mozilla/frame-script */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/toolkit/components/passwordmgr/test/browser/browser_context_menu_autocomplete_interaction.js b/toolkit/components/passwordmgr/test/browser/browser_context_menu_autocomplete_interaction.js
index 0c15bdcb6dc2..e38a39561b79 100644
--- a/toolkit/components/passwordmgr/test/browser/browser_context_menu_autocomplete_interaction.js
+++ b/toolkit/components/passwordmgr/test/browser/browser_context_menu_autocomplete_interaction.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 /*
  * Test the password manager context menu interaction with autocomplete.
  */
diff --git a/toolkit/components/passwordmgr/test/browser/browser_master_password_autocomplete.js b/toolkit/components/passwordmgr/test/browser/browser_master_password_autocomplete.js
index 7f2f43410e1b..e75f5bb70a96 100644
--- a/toolkit/components/passwordmgr/test/browser/browser_master_password_autocomplete.js
+++ b/toolkit/components/passwordmgr/test/browser/browser_master_password_autocomplete.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 const HOST = "https://example.com";
 const URL = HOST + "/browser/toolkit/components/passwordmgr/test/browser/form_basic.html";
 const TIMEOUT_PREF = "signon.masterPasswordReprompt.timeout_ms";
diff --git a/toolkit/components/perfmonitoring/tests/browser/browser_compartments.js b/toolkit/components/perfmonitoring/tests/browser/browser_compartments.js
index 3c4285f1acdd..27ccc01c819f 100644
--- a/toolkit/components/perfmonitoring/tests/browser/browser_compartments.js
+++ b/toolkit/components/perfmonitoring/tests/browser/browser_compartments.js
@@ -2,6 +2,7 @@
  * http://creativecommons.org/publicdomain/zero/1.0/ */
 
 /* eslint-env mozilla/frame-script */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 "use strict";
 
diff --git a/toolkit/components/perfmonitoring/tests/browser/browser_webpagePerformanceAlerts.js b/toolkit/components/perfmonitoring/tests/browser/browser_webpagePerformanceAlerts.js
index dfa034daa27c..931b36f98294 100644
--- a/toolkit/components/perfmonitoring/tests/browser/browser_webpagePerformanceAlerts.js
+++ b/toolkit/components/perfmonitoring/tests/browser/browser_webpagePerformanceAlerts.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 /**
diff --git a/toolkit/components/startup/tests/browser/browser_crash_detection.js b/toolkit/components/startup/tests/browser/browser_crash_detection.js
index 0f3b0270f3ca..59889f2a28bc 100644
--- a/toolkit/components/startup/tests/browser/browser_crash_detection.js
+++ b/toolkit/components/startup/tests/browser/browser_crash_detection.js
@@ -1,6 +1,7 @@
 /* Any copyright is dedicated to the Public Domain.
  *    http://creativecommons.org/publicdomain/zero/1.0/
  */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 function test() {
   function checkLastSuccess() {
diff --git a/toolkit/components/tooltiptext/tests/browser_input_file_tooltips.js b/toolkit/components/tooltiptext/tests/browser_input_file_tooltips.js
index 0fe45da7e96a..e8b175b102a3 100644
--- a/toolkit/components/tooltiptext/tests/browser_input_file_tooltips.js
+++ b/toolkit/components/tooltiptext/tests/browser_input_file_tooltips.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 let tempFile;
 add_task(async function setup() {
diff --git a/toolkit/components/windowcreator/test/browser_bug1204626.js b/toolkit/components/windowcreator/test/browser_bug1204626.js
index 0d457453535f..2c6ecbb9b555 100644
--- a/toolkit/components/windowcreator/test/browser_bug1204626.js
+++ b/toolkit/components/windowcreator/test/browser_bug1204626.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict"; // -*- js-indent-level: 2; indent-tabs-mode: nil -*-
 var Cc = Components.classes;
 var Ci = Components.interfaces;
diff --git a/toolkit/content/tests/browser/browser_block_multipleMedia.js b/toolkit/content/tests/browser/browser_block_multipleMedia.js
index 3a3f76c6765a..f670fd8849c0 100644
--- a/toolkit/content/tests/browser/browser_block_multipleMedia.js
+++ b/toolkit/content/tests/browser/browser_block_multipleMedia.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_multipleAudio.html";
 
 var SuspendedType = {
diff --git a/toolkit/content/tests/browser/browser_block_notInTreeAudio.js b/toolkit/content/tests/browser/browser_block_notInTreeAudio.js
index 6f03be925231..6daf2f5c202f 100644
--- a/toolkit/content/tests/browser/browser_block_notInTreeAudio.js
+++ b/toolkit/content/tests/browser/browser_block_notInTreeAudio.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_nonAutoplayAudio.html";
 
 var SuspendedType = {
diff --git a/toolkit/content/tests/browser/browser_bug1170531.js b/toolkit/content/tests/browser/browser_bug1170531.js
index 2f2e6f455a6e..d1be00ff9b76 100644
--- a/toolkit/content/tests/browser/browser_bug1170531.js
+++ b/toolkit/content/tests/browser/browser_bug1170531.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 // Test for bug 1170531
 // https://bugzilla.mozilla.org/show_bug.cgi?id=1170531
 
diff --git a/toolkit/content/tests/browser/browser_findbar.js b/toolkit/content/tests/browser/browser_findbar.js
index 7b1f8fb3750f..83fea72f5bb4 100644
--- a/toolkit/content/tests/browser/browser_findbar.js
+++ b/toolkit/content/tests/browser/browser_findbar.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 Components.utils.import("resource://gre/modules/Timer.jsm", this);
 
 const TEST_PAGE_URI = "data:text/html;charset=utf-8,The letter s.";
diff --git a/toolkit/modules/tests/browser/browser_FinderHighlighter.js b/toolkit/modules/tests/browser/browser_FinderHighlighter.js
index 200f645379a6..cc957d09d6f8 100644
--- a/toolkit/modules/tests/browser/browser_FinderHighlighter.js
+++ b/toolkit/modules/tests/browser/browser_FinderHighlighter.js
@@ -1,3 +1,4 @@
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 "use strict";
 
 Cu.import("resource://testing-common/BrowserTestUtils.jsm", this);
diff --git a/toolkit/mozapps/extensions/test/browser/browser_bug587970.js b/toolkit/mozapps/extensions/test/browser/browser_bug587970.js
index 30f6a5e5e651..c01ec59ce2a2 100644
--- a/toolkit/mozapps/extensions/test/browser/browser_bug587970.js
+++ b/toolkit/mozapps/extensions/test/browser/browser_bug587970.js
@@ -1,6 +1,7 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 // Bug 587970 - Provide ability "Update all now" within 'Available Updates' screen
 
diff --git a/toolkit/mozapps/extensions/test/browser/browser_cancelCompatCheck.js b/toolkit/mozapps/extensions/test/browser/browser_cancelCompatCheck.js
index bd021854c5cd..f229eb6f5d55 100644
--- a/toolkit/mozapps/extensions/test/browser/browser_cancelCompatCheck.js
+++ b/toolkit/mozapps/extensions/test/browser/browser_cancelCompatCheck.js
@@ -1,6 +1,7 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 // Test that we can cancel the add-on compatibility check while it is
 // in progress (bug 772484).
diff --git a/toolkit/mozapps/extensions/test/browser/browser_inlinesettings_browser.js b/toolkit/mozapps/extensions/test/browser/browser_inlinesettings_browser.js
index dbfbb1ebaea9..7991cb63db70 100644
--- a/toolkit/mozapps/extensions/test/browser/browser_inlinesettings_browser.js
+++ b/toolkit/mozapps/extensions/test/browser/browser_inlinesettings_browser.js
@@ -1,6 +1,7 @@
 /* Any copyright is dedicated to the Public Domain.
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
+/* eslint-disable mozilla/no-arbitrary-setTimeout */
 
 /* globals TestUtils */
 
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/browser-test.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/browser-test.js
index 6fd8ecb55440..6e6862f68ef2 100644
--- a/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/browser-test.js
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/configs/browser-test.js
@@ -60,6 +60,7 @@ module.exports = {
   "rules": {
     "mozilla/import-content-task-globals": "error",
     "mozilla/import-headjs-globals": "warn",
-    "mozilla/mark-test-function-used": "warn"
+    "mozilla/mark-test-function-used": "warn",
+    "mozilla/no-arbitrary-setTimeout": "error"
   }
 };
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-arbitrary-setTimeout.js b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-arbitrary-setTimeout.js
index bbf6d4e85600..10019f72b9ab 100644
--- a/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-arbitrary-setTimeout.js
+++ b/tools/lint/eslint/eslint-plugin-mozilla/lib/rules/no-arbitrary-setTimeout.js
@@ -13,6 +13,10 @@
 // -----------------------------------------------------------------------------
 
 var helpers = require("../helpers");
+var testTypes = new Set([
+  "browser",
+  "xpcshell"
+]);
 
 module.exports = {
   meta: {
@@ -30,11 +34,11 @@ module.exports = {
   create(context) {
     return {
       "CallExpression": function(node) {
-        // We don't want to run this on mochitests as mochitest already
+        // We don't want to run this on mochitest plain as it already
         // prevents flaky setTimeout at runtime. This check is built-in
-        // to the rule itself as sometimes xpcshell tests can live
-        // alongside mochitests and so can't be configured via config.
-        if (helpers.getTestType(context) !== "xpcshell") {
+        // to the rule itself as sometimes other tests can live alongside
+        // plain mochitests and so it can't be configured via eslintrc.
+        if (!testTypes.has(helpers.getTestType(context))) {
           return;
         }
 
diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-arbitrary-setTimeout.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-arbitrary-setTimeout.js
index 03c60483aadc..c57efbb03e57 100644
--- a/tools/lint/eslint/eslint-plugin-mozilla/tests/no-arbitrary-setTimeout.js
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/no-arbitrary-setTimeout.js
@@ -31,7 +31,7 @@ ruleTester.run("no-arbitrary-setTimeout", rule, {
   valid: [
     wrapCode("setTimeout(function() {}, 0);"),
     wrapCode("setTimeout(function() {});"),
-    wrapCode("setTimeout(function() {}, 10);", "browser_test.js")
+    wrapCode("setTimeout(function() {}, 10);", "test_foo.js")
   ],
   invalid: [
     invalidCode("setTimeout(function() {}, 10);"),