Merge mozilla-central to inbound. a=merge CLOSED TREE
authorNarcis Beleuzu <nbeleuzu@mozilla.com>
Thu, 05 Apr 2018 01:09:42 +0300
changeset 777642 d52acd95d094834566daa57d751ee06db71f5f66
parent 777641 f4753aa286e50298e6320a5dc6b1e0c233b130a7 (current diff)
parent 777562 071ee904485e21e19ca08456d32bce6825b77a26 (diff)
child 777643 829f5e20239878b18317e9cf221ccc4b930a6107
push id105257
push userbmo:jmuizelaar@mozilla.com
push dateThu, 05 Apr 2018 02:07:04 +0000
reviewersmerge
milestone61.0a1
Merge mozilla-central to inbound. a=merge CLOSED TREE
browser/components/enterprisepolicies/Policies.jsm
browser/components/enterprisepolicies/schemas/policies-schema.json
dom/xul/crashtests/451311-1.xul
dom/xul/crashtests/495635-1.xul
dom/xul/crashtests/509719-1-overlay.xul
dom/xul/crashtests/509719-1.xul
dom/xul/crashtests/509719-2-overlay.xul
dom/xul/crashtests/509719-2.xul
dom/xul/crashtests/extA1.xul
dom/xul/crashtests/extA2.xul
dom/xul/crashtests/extB1.xul
dom/xul/test/bug497875-iframe.xul
dom/xul/test/overlay1_bug335375.xul
dom/xul/test/overlay2_bug335375.xul
dom/xul/test/overlay_640158.xul
dom/xul/test/test_bug335375.xul
dom/xul/test/test_bug497875.xul
dom/xul/test/test_bug640158_overlay_persist.xul
layout/reftests/xul-document-load/subdir/test011-overlay.xul
layout/reftests/xul-document-load/subdir/test011.css
layout/reftests/xul-document-load/subdir/test014-overlay-2.xul
layout/reftests/xul-document-load/subdir/test014-overlay.xul
layout/reftests/xul-document-load/subdir/test015-overlay.xul
layout/reftests/xul-document-load/subdir/test015.js
layout/reftests/xul-document-load/test001-overlay.xul
layout/reftests/xul-document-load/test001.css
layout/reftests/xul-document-load/test001.xul
layout/reftests/xul-document-load/test002-overlay-1.xul
layout/reftests/xul-document-load/test002-overlay-2.xul
layout/reftests/xul-document-load/test002.css
layout/reftests/xul-document-load/test002.xul
layout/reftests/xul-document-load/test007-overlay.xul
layout/reftests/xul-document-load/test007.xul
layout/reftests/xul-document-load/test009.xul
layout/reftests/xul-document-load/test010-overlay.xul
layout/reftests/xul-document-load/test011.xul
layout/reftests/xul-document-load/test014.xul
layout/reftests/xul-document-load/test015.xul
layout/reftests/xul-document-load/test016-overlay.xul
layout/reftests/xul-document-load/test016.xul
layout/reftests/xul-document-load/test017-020.js
layout/reftests/xul-document-load/test017-overlay-2.xul
layout/reftests/xul-document-load/test017-overlay.xul
layout/reftests/xul-document-load/test017.xul
layout/reftests/xul-document-load/test018-overlay-2.xul
layout/reftests/xul-document-load/test018-overlay.xul
layout/reftests/xul-document-load/test018.xul
layout/reftests/xul-document-load/test019-overlay.xul
layout/reftests/xul-document-load/test019.css
layout/reftests/xul-document-load/test019.xul
layout/reftests/xul-document-load/test020-overlay.xul
layout/reftests/xul-document-load/test020.css
layout/reftests/xul-document-load/test020.xul
layout/reftests/xul-document-load/test021-overlay.xul
layout/reftests/xul-document-load/test021.xul
layout/xul/tree/crashtests/509602-1-overlay.xul
layout/xul/tree/crashtests/509602-1.xul
taskcluster/ci/release-snap/kind.yml
taskcluster/docker/firefox-snap/fetch_macaroons.sh
taskcluster/taskgraph/transforms/release_snap.py
toolkit/content/xul.css
toolkit/locales/en-US/chrome/mozapps/extensions/about.dtd
toolkit/mozapps/extensions/content/about.js
toolkit/mozapps/extensions/content/about.xul
toolkit/mozapps/extensions/test/browser/addon_about.xul
toolkit/mozapps/extensions/test/browser/browser_about.js
toolkit/themes/osx/mozapps/extensions/about.css
toolkit/themes/windows/mozapps/extensions/about.css
copy from browser/base/content/browser.js
copy to browser/base/content/browser-siteIdentity.js
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser-siteIdentity.js
@@ -1,7316 +1,12 @@
-/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
- * This Source Code Form is subject to the terms of the Mozilla Public
+/* 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-env mozilla/browser-window */
-/* globals StatusPanel */
-
-ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
-ChromeUtils.import("resource://gre/modules/Services.jsm");
-ChromeUtils.import("resource://gre/modules/AppConstants.jsm");
-ChromeUtils.import("resource://gre/modules/NotificationDB.jsm");
-
-const {WebExtensionPolicy} = Cu.getGlobalForObject(Services);
-
-// 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",
-  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://gre/modules/E10SUtils.jsm",
-  ExtensionsUI: "resource:///modules/ExtensionsUI.jsm",
-  FormValidationHandler: "resource:///modules/FormValidationHandler.jsm",
-  LanguagePrompt: "resource://gre/modules/LanguagePrompt.jsm",
-  LightweightThemeConsumer: "resource://gre/modules/LightweightThemeConsumer.jsm",
-  LightweightThemeManager: "resource://gre/modules/LightweightThemeManager.jsm",
-  Log: "resource://gre/modules/Log.jsm",
-  LoginManagerParent: "resource://gre/modules/LoginManagerParent.jsm",
-  NetUtil: "resource://gre/modules/NetUtil.jsm",
-  NewTabUtils: "resource://gre/modules/NewTabUtils.jsm",
-  OpenInTabsUtils: "resource:///modules/OpenInTabsUtils.jsm",
-  PageActions: "resource:///modules/PageActions.jsm",
-  PageThumbs: "resource://gre/modules/PageThumbs.jsm",
-  PanelMultiView: "resource:///modules/PanelMultiView.jsm",
-  PanelView: "resource:///modules/PanelMultiView.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",
-  Sanitizer: "resource:///modules/Sanitizer.jsm",
-  SessionStore: "resource:///modules/sessionstore/SessionStore.jsm",
-  SchedulePressure: "resource:///modules/SchedulePressure.jsm",
-  ShortcutUtils: "resource://gre/modules/ShortcutUtils.jsm",
-  SimpleServiceDiscovery: "resource://gre/modules/SimpleServiceDiscovery.jsm",
-  SitePermissions: "resource:///modules/SitePermissions.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",
-  webrtcUI: "resource:///modules/webrtcUI.jsm",
-  ZoomUI: "resource:///modules/ZoomUI.jsm",
-});
-
-if (AppConstants.MOZ_CRASHREPORTER) {
-  ChromeUtils.defineModuleGetter(this, "PluginCrashReporter",
-    "resource:///modules/ContentCrashHandlers.jsm");
-}
-
-XPCOMUtils.defineLazyScriptGetter(this, "PrintUtils",
-                                  "chrome://global/content/printUtils.js");
-XPCOMUtils.defineLazyScriptGetter(this, "ZoomManager",
-                                  "chrome://global/content/viewZoomOverlay.js");
-XPCOMUtils.defineLazyScriptGetter(this, "FullZoom",
-                                  "chrome://browser/content/browser-fullZoom.js");
-XPCOMUtils.defineLazyScriptGetter(this, "PanelUI",
-                                  "chrome://browser/content/customizableui/panelUI.js");
-XPCOMUtils.defineLazyScriptGetter(this, "gViewSourceUtils",
-                                  "chrome://global/content/viewSourceUtils.js");
-XPCOMUtils.defineLazyScriptGetter(this, ["LightWeightThemeWebInstaller",
-                                         "gExtensionsNotifications",
-                                         "gXPInstallObserver"],
-                                  "chrome://browser/content/browser-addons.js");
-XPCOMUtils.defineLazyScriptGetter(this, "ctrlTab",
-                                  "chrome://browser/content/browser-ctrlTab.js");
-XPCOMUtils.defineLazyScriptGetter(this, "CustomizationHandler",
-                                  "chrome://browser/content/browser-customization.js");
-XPCOMUtils.defineLazyScriptGetter(this, ["PointerLock", "FullScreen"],
-                                  "chrome://browser/content/browser-fullScreenAndPointerLock.js");
-XPCOMUtils.defineLazyScriptGetter(this, ["gGestureSupport", "gHistorySwipeAnimation"],
-                                  "chrome://browser/content/browser-gestureSupport.js");
-XPCOMUtils.defineLazyScriptGetter(this, "gSafeBrowsing",
-                                  "chrome://browser/content/browser-safebrowsing.js");
-XPCOMUtils.defineLazyScriptGetter(this, "gSync",
-                                  "chrome://browser/content/browser-sync.js");
-XPCOMUtils.defineLazyScriptGetter(this, "gBrowserThumbnails",
-                                  "chrome://browser/content/browser-thumbnails.js");
-XPCOMUtils.defineLazyScriptGetter(this, ["setContextMenuContentData",
-                                         "openContextMenu", "nsContextMenu"],
-                                  "chrome://browser/content/nsContextMenu.js");
-XPCOMUtils.defineLazyScriptGetter(this, ["DownloadsPanel",
-                                         "DownloadsOverlayLoader",
-                                         "DownloadsSubview",
-                                         "DownloadsView", "DownloadsViewUI",
-                                         "DownloadsViewController",
-                                         "DownloadsSummary", "DownloadsFooter",
-                                         "DownloadsBlockedSubview"],
-                                  "chrome://browser/content/downloads/downloads.js");
-XPCOMUtils.defineLazyScriptGetter(this, ["DownloadsButton",
-                                         "DownloadsIndicatorView"],
-                                  "chrome://browser/content/downloads/indicator.js");
-XPCOMUtils.defineLazyScriptGetter(this, "gEditItemOverlay",
-                                  "chrome://browser/content/places/editBookmark.js");
-if (AppConstants.NIGHTLY_BUILD) {
-  XPCOMUtils.defineLazyScriptGetter(this, "gWebRender",
-                                    "chrome://browser/content/browser-webrender.js");
-}
-
-// lazy service getters
-
-XPCOMUtils.defineLazyServiceGetters(this, {
-  Favicons: ["@mozilla.org/browser/favicon-service;1", "mozIAsyncFavicons"],
-  gAboutNewTabService: ["@mozilla.org/browser/aboutnewtab-service;1", "nsIAboutNewTabService"],
-  gDNSService: ["@mozilla.org/network/dns-service;1", "nsIDNSService"],
-  gSerializationHelper: ["@mozilla.org/network/serialization-helper;1", "nsISerializationHelper"],
-  Marionette: ["@mozilla.org/remote/marionette;1", "nsIMarionette"],
-  SessionStartup: ["@mozilla.org/browser/sessionstartup;1", "nsISessionStartup"],
-  WindowsUIUtils: ["@mozilla.org/windows-ui-utils;1", "nsIWindowsUIUtils"],
-});
-
-if (AppConstants.MOZ_CRASHREPORTER) {
-  XPCOMUtils.defineLazyServiceGetter(this, "gCrashReporter",
-                                     "@mozilla.org/xre/app-info;1",
-                                     "nsICrashReporter");
-}
-
-XPCOMUtils.defineLazyGetter(this, "gBrowserBundle", function() {
-  return Services.strings.createBundle("chrome://browser/locale/browser.properties");
-});
-XPCOMUtils.defineLazyGetter(this, "gNavigatorBundle", function() {
-  // This is a stringbundle-like interface to gBrowserBundle, formerly a getter for
-  // the "bundle_browser" element.
-  return {
-    getString(key) {
-      return gBrowserBundle.GetStringFromName(key);
-    },
-    getFormattedString(key, array) {
-      return gBrowserBundle.formatStringFromName(key, array, array.length);
-    }
-  };
-});
-XPCOMUtils.defineLazyGetter(this, "gTabBrowserBundle", function() {
-  return Services.strings.createBundle("chrome://browser/locale/tabbrowser.properties");
-});
-
-XPCOMUtils.defineLazyGetter(this, "gCustomizeMode", function() {
-  let scope = {};
-  ChromeUtils.import("resource:///modules/CustomizeMode.jsm", scope);
-  return new scope.CustomizeMode(window);
-});
-
-XPCOMUtils.defineLazyGetter(this, "InlineSpellCheckerUI", function() {
-  let tmp = {};
-  ChromeUtils.import("resource://gre/modules/InlineSpellChecker.jsm", tmp);
-  return new tmp.InlineSpellChecker();
-});
-
-XPCOMUtils.defineLazyGetter(this, "PageMenuParent", function() {
-  let tmp = {};
-  ChromeUtils.import("resource://gre/modules/PageMenu.jsm", tmp);
-  return new tmp.PageMenuParent();
-});
-
-XPCOMUtils.defineLazyGetter(this, "PopupNotifications", function() {
-  let tmp = {};
-  ChromeUtils.import("resource://gre/modules/PopupNotifications.jsm", tmp);
-  try {
-    // Hide all notifications while the URL is being edited and the address bar
-    // has focus, including the virtual focus in the results popup.
-    // We also have to hide notifications explicitly when the window is
-    // minimized because of the effects of the "noautohide" attribute on Linux.
-    // This can be removed once bug 545265 and bug 1320361 are fixed.
-    let shouldSuppress = () => {
-      return window.windowState == window.STATE_MINIMIZED ||
-             (gURLBar.getAttribute("pageproxystate") != "valid" &&
-             gURLBar.focused);
-    };
-    return new tmp.PopupNotifications(gBrowser,
-                                      document.getElementById("notification-popup"),
-                                      document.getElementById("notification-popup-box"),
-                                      { shouldSuppress });
-  } catch (ex) {
-    Cu.reportError(ex);
-    return null;
-  }
-});
-
-XPCOMUtils.defineLazyGetter(this, "Win7Features", function() {
-  if (AppConstants.platform != "win")
-    return null;
-
-  const WINTASKBAR_CONTRACTID = "@mozilla.org/windows-taskbar;1";
-  if (WINTASKBAR_CONTRACTID in Cc &&
-      Cc[WINTASKBAR_CONTRACTID].getService(Ci.nsIWinTaskbar).available) {
-    let AeroPeek = ChromeUtils.import("resource:///modules/WindowsPreviewPerTab.jsm", {}).AeroPeek;
-    return {
-      onOpenWindow() {
-        AeroPeek.onOpenWindow(window);
-      },
-      onCloseWindow() {
-        AeroPeek.onCloseWindow(window);
-      }
-    };
-  }
-  return null;
-});
-
-var gBrowser;
-var gLastValidURLStr = "";
-var gInPrintPreviewMode = false;
-var gContextMenu = null; // nsContextMenu instance
-var gMultiProcessBrowser =
-  window.QueryInterface(Ci.nsIInterfaceRequestor)
-        .getInterface(Ci.nsIWebNavigation)
-        .QueryInterface(Ci.nsILoadContext)
-        .useRemoteTabs;
-
-if (AppConstants.platform != "macosx") {
-  var gEditUIVisible = true;
-}
-
-/* globals gNavToolbox, gURLBar:true */
-[
-  ["gNavToolbox",         "navigator-toolbox"],
-  ["gURLBar",             "urlbar"],
-].forEach(function(elementGlobal) {
-  var [name, id] = elementGlobal;
-  Object.defineProperty(window, name, {
-    configurable: true,
-    enumerable: true,
-    get() {
-      var element = document.getElementById(id);
-      if (!element)
-        return null;
-      delete window[name];
-      return window[name] = element;
-    },
-    set(val) {
-      delete window[name];
-      return window[name] = val;
-    },
-  });
-});
-
-// Smart getter for the findbar.  If you don't wish to force the creation of
-// the findbar, check gFindBarInitialized first.
-
-Object.defineProperty(this, "gFindBar", {
-  configurable: true,
-  enumerable: true,
-  get() {
-    return gBrowser.getCachedFindBar();
-  },
-});
-
-Object.defineProperty(this, "gFindBarInitialized", {
-  configurable: true,
-  enumerable: true,
-  get() {
-    return gBrowser.isFindBarInitialized();
-  },
-});
-
-Object.defineProperty(this, "gFindBarPromise", {
-  configurable: true,
-  enumerable: true,
-  get() {
-    return gBrowser.getFindBar();
-  },
-});
-
-async function gLazyFindCommand(cmd, ...args) {
-  let fb = await gFindBarPromise;
-  // We could be closed by now, or the tab with XBL binding could have gone away:
-  if (fb && fb[cmd]) {
-    fb[cmd].apply(fb, args);
-  }
-}
-
-Object.defineProperty(this, "AddonManager", {
-  configurable: true,
-  enumerable: true,
-  get() {
-    let tmp = {};
-    ChromeUtils.import("resource://gre/modules/AddonManager.jsm", tmp);
-    return this.AddonManager = tmp.AddonManager;
-  },
-  set(val) {
-    delete this.AddonManager;
-    return this.AddonManager = val;
-  },
-});
-
-
-var gInitialPages = [
-  "about:blank",
-  "about:newtab",
-  "about:home",
-  "about:privatebrowsing",
-  "about:welcomeback",
-  "about:sessionrestore"
-];
-
-function isInitialPage(url) {
-  return gInitialPages.includes(url) || url == BROWSER_NEW_TAB_URL;
-}
-
-function* browserWindows() {
-  let windows = Services.wm.getEnumerator("navigator:browser");
-  while (windows.hasMoreElements())
-    yield windows.getNext();
-}
-
-/**
-* We can avoid adding multiple load event listeners and save some time by adding
-* one listener that calls all real handlers.
-*/
-function pageShowEventHandlers(persisted) {
-  XULBrowserWindow.asyncUpdateUI();
-}
-
-function UpdateBackForwardCommands(aWebNavigation) {
-  var backBroadcaster = document.getElementById("Browser:Back");
-  var forwardBroadcaster = document.getElementById("Browser:Forward");
-
-  // Avoid setting attributes on broadcasters if the value hasn't changed!
-  // Remember, guys, setting attributes on elements is expensive!  They
-  // get inherited into anonymous content, broadcast to other widgets, etc.!
-  // Don't do it if the value hasn't changed! - dwh
-
-  var backDisabled = backBroadcaster.hasAttribute("disabled");
-  var forwardDisabled = forwardBroadcaster.hasAttribute("disabled");
-  if (backDisabled == aWebNavigation.canGoBack) {
-    if (backDisabled)
-      backBroadcaster.removeAttribute("disabled");
-    else
-      backBroadcaster.setAttribute("disabled", true);
-  }
-
-  if (forwardDisabled == aWebNavigation.canGoForward) {
-    if (forwardDisabled)
-      forwardBroadcaster.removeAttribute("disabled");
-    else
-      forwardBroadcaster.setAttribute("disabled", true);
-  }
-}
-
-/**
- * Click-and-Hold implementation for the Back and Forward buttons
- * XXXmano: should this live in toolbarbutton.xml?
- */
-function SetClickAndHoldHandlers() {
-  // Bug 414797: Clone the back/forward buttons' context menu into both buttons.
-  let popup = document.getElementById("backForwardMenu").cloneNode(true);
-  popup.removeAttribute("id");
-  // Prevent the back/forward buttons' context attributes from being inherited.
-  popup.setAttribute("context", "");
-
-  let backButton = document.getElementById("back-button");
-  backButton.setAttribute("type", "menu");
-  backButton.appendChild(popup);
-  gClickAndHoldListenersOnElement.add(backButton);
-
-  let forwardButton = document.getElementById("forward-button");
-  popup = popup.cloneNode(true);
-  forwardButton.setAttribute("type", "menu");
-  forwardButton.appendChild(popup);
-  gClickAndHoldListenersOnElement.add(forwardButton);
-}
-
-
-const gClickAndHoldListenersOnElement = {
-  _timers: new Map(),
-
-  _mousedownHandler(aEvent) {
-    if (aEvent.button != 0 ||
-        aEvent.currentTarget.open ||
-        aEvent.currentTarget.disabled)
-      return;
-
-    // Prevent the menupopup from opening immediately
-    aEvent.currentTarget.firstChild.hidden = true;
-
-    aEvent.currentTarget.addEventListener("mouseout", this);
-    aEvent.currentTarget.addEventListener("mouseup", this);
-    this._timers.set(aEvent.currentTarget, setTimeout((b) => this._openMenu(b), 500, aEvent.currentTarget));
-  },
-
-  _clickHandler(aEvent) {
-    if (aEvent.button == 0 &&
-        aEvent.target == aEvent.currentTarget &&
-        !aEvent.currentTarget.open &&
-        !aEvent.currentTarget.disabled) {
-      let cmdEvent = document.createEvent("xulcommandevent");
-      cmdEvent.initCommandEvent("command", true, true, window, 0,
-                                aEvent.ctrlKey, aEvent.altKey, aEvent.shiftKey,
-                                aEvent.metaKey, null, aEvent.mozInputSource);
-      aEvent.currentTarget.dispatchEvent(cmdEvent);
-
-      // This is here to cancel the XUL default event
-      // dom.click() triggers a command even if there is a click handler
-      // however this can now be prevented with preventDefault().
-      aEvent.preventDefault();
-    }
-  },
-
-  _openMenu(aButton) {
-    this._cancelHold(aButton);
-    aButton.firstChild.hidden = false;
-    aButton.open = true;
-  },
-
-  _mouseoutHandler(aEvent) {
-    let buttonRect = aEvent.currentTarget.getBoundingClientRect();
-    if (aEvent.clientX >= buttonRect.left &&
-        aEvent.clientX <= buttonRect.right &&
-        aEvent.clientY >= buttonRect.bottom)
-      this._openMenu(aEvent.currentTarget);
-    else
-      this._cancelHold(aEvent.currentTarget);
-  },
-
-  _mouseupHandler(aEvent) {
-    this._cancelHold(aEvent.currentTarget);
-  },
-
-  _cancelHold(aButton) {
-    clearTimeout(this._timers.get(aButton));
-    aButton.removeEventListener("mouseout", this);
-    aButton.removeEventListener("mouseup", this);
-  },
-
-  handleEvent(e) {
-    switch (e.type) {
-      case "mouseout":
-        this._mouseoutHandler(e);
-        break;
-      case "mousedown":
-        this._mousedownHandler(e);
-        break;
-      case "click":
-        this._clickHandler(e);
-        break;
-      case "mouseup":
-        this._mouseupHandler(e);
-        break;
-    }
-  },
-
-  remove(aButton) {
-    aButton.removeEventListener("mousedown", this, true);
-    aButton.removeEventListener("click", this, true);
-  },
-
-  add(aElm) {
-    this._timers.delete(aElm);
-
-    aElm.addEventListener("mousedown", this, true);
-    aElm.addEventListener("click", this, true);
-  }
-};
-
-const gSessionHistoryObserver = {
-  observe(subject, topic, data) {
-    if (topic != "browser:purge-session-history")
-      return;
-
-    var backCommand = document.getElementById("Browser:Back");
-    backCommand.setAttribute("disabled", "true");
-    var fwdCommand = document.getElementById("Browser:Forward");
-    fwdCommand.setAttribute("disabled", "true");
-
-    // Hide session restore button on about:home
-    window.messageManager.broadcastAsyncMessage("Browser:HideSessionRestoreButton");
-
-    // Clear undo history of the URL bar
-    gURLBar.editor.transactionManager.clear();
-  }
-};
-
-const gStoragePressureObserver = {
-  _lastNotificationTime: -1,
-
-  observe(subject, topic, data) {
-    if (topic != "QuotaManager::StoragePressure" ||
-        !Services.prefs.getBoolPref("browser.storageManager.enabled")) {
-      return;
-    }
-
-    const NOTIFICATION_VALUE = "storage-pressure-notification";
-    let notificationBox = document.getElementById("high-priority-global-notificationbox");
-    if (notificationBox.getNotificationWithValue(NOTIFICATION_VALUE)) {
-      // Do not display the 2nd notification when there is already one
-      return;
-    }
-
-    // Don't display notification twice within the given interval.
-    // This is because
-    //   - not to annoy user
-    //   - give user some time to clean space.
-    //     Even user sees notification and starts acting, it still takes some time.
-    const MIN_NOTIFICATION_INTERVAL_MS =
-      Services.prefs.getIntPref("browser.storageManager.pressureNotification.minIntervalMS");
-    let duration = Date.now() - this._lastNotificationTime;
-    if (duration <= MIN_NOTIFICATION_INTERVAL_MS) {
-      return;
-    }
-    this._lastNotificationTime = Date.now();
-
-    const BYTES_IN_GIGABYTE = 1073741824;
-    const USAGE_THRESHOLD_BYTES = BYTES_IN_GIGABYTE *
-      Services.prefs.getIntPref("browser.storageManager.pressureNotification.usageThresholdGB");
-    let msg = "";
-    let buttons = [];
-    let usage = subject.QueryInterface(Ci.nsISupportsPRUint64).data;
-    let prefStrBundle = document.getElementById("bundle_preferences");
-    let brandShortName = document.getElementById("bundle_brand").getString("brandShortName");
-    buttons.push({
-      label: prefStrBundle.getString("spaceAlert.learnMoreButton.label"),
-      accessKey: prefStrBundle.getString("spaceAlert.learnMoreButton.accesskey"),
-      callback(notificationBar, button) {
-        let learnMoreURL = Services.urlFormatter.formatURLPref("app.support.baseURL") + "storage-permissions";
-        gBrowser.selectedTab = gBrowser.addTab(learnMoreURL);
-      }
-    });
-    if (usage < USAGE_THRESHOLD_BYTES) {
-      // The firefox-used space < 5GB, then warn user to free some disk space.
-      // This is because this usage is small and not the main cause for space issue.
-      // In order to avoid the bad and wrong impression among users that
-      // firefox eats disk space a lot, indicate users to clean up other disk space.
-      msg = prefStrBundle.getFormattedString("spaceAlert.under5GB.message", [brandShortName]);
-      buttons.push({
-        label: prefStrBundle.getString("spaceAlert.under5GB.okButton.label"),
-        accessKey: prefStrBundle.getString("spaceAlert.under5GB.okButton.accesskey"),
-        callback() {}
-      });
-    } else {
-      // The firefox-used space >= 5GB, then guide users to about:preferences
-      // to clear some data stored on firefox by websites.
-      let descriptionStringID = "spaceAlert.over5GB.message1";
-      let prefButtonLabelStringID = "spaceAlert.over5GB.prefButton.label";
-      let prefButtonAccesskeyStringID = "spaceAlert.over5GB.prefButton.accesskey";
-      if (AppConstants.platform == "win") {
-        descriptionStringID = "spaceAlert.over5GB.messageWin1";
-        prefButtonLabelStringID = "spaceAlert.over5GB.prefButtonWin.label";
-        prefButtonAccesskeyStringID = "spaceAlert.over5GB.prefButtonWin.accesskey";
-      }
-      msg = prefStrBundle.getFormattedString(descriptionStringID, [brandShortName]);
-      buttons.push({
-        label: prefStrBundle.getString(prefButtonLabelStringID),
-        accessKey: prefStrBundle.getString(prefButtonAccesskeyStringID),
-        callback(notificationBar, button) {
-          // The advanced subpanes are only supported in the old organization, which will
-          // be removed by bug 1349689.
-          let win = gBrowser.ownerGlobal;
-          win.openPreferences("privacy-sitedata", { origin: "storagePressure" });
-        }
-      });
-    }
-
-    notificationBox.appendNotification(
-      msg, NOTIFICATION_VALUE, null, notificationBox.PRIORITY_WARNING_HIGH, buttons, null);
-  }
-};
-
-var gPopupBlockerObserver = {
-  handleEvent(aEvent) {
-    if (aEvent.originalTarget != gBrowser.selectedBrowser)
-      return;
-
-    gIdentityHandler.refreshIdentityBlock();
-
-    if (!gBrowser.selectedBrowser.blockedPopups ||
-        !gBrowser.selectedBrowser.blockedPopups.length) {
-      // Hide the notification box (if it's visible).
-      let notificationBox = gBrowser.getNotificationBox();
-      let notification = notificationBox.getNotificationWithValue("popup-blocked");
-      if (notification) {
-        notificationBox.removeNotification(notification, false);
-      }
-      return;
-    }
-
-    // Only show the notification again if we've not already shown it. Since
-    // notifications are per-browser, we don't need to worry about re-adding
-    // it.
-    if (!gBrowser.selectedBrowser.blockedPopups.reported) {
-      if (Services.prefs.getBoolPref("privacy.popups.showBrowserMessage")) {
-        var brandBundle = document.getElementById("bundle_brand");
-        var brandShortName = brandBundle.getString("brandShortName");
-        var popupCount = gBrowser.selectedBrowser.blockedPopups.length;
-
-        var stringKey = AppConstants.platform == "win"
-                        ? "popupWarningButton"
-                        : "popupWarningButtonUnix";
-
-        var popupButtonText = gNavigatorBundle.getString(stringKey);
-        var popupButtonAccesskey = gNavigatorBundle.getString(stringKey + ".accesskey");
-
-        var messageBase = gNavigatorBundle.getString("popupWarning.message");
-        var message = PluralForm.get(popupCount, messageBase)
-                                .replace("#1", brandShortName)
-                                .replace("#2", popupCount);
-
-        let notificationBox = gBrowser.getNotificationBox();
-        let notification = notificationBox.getNotificationWithValue("popup-blocked");
-        if (notification) {
-          notification.label = message;
-        } else {
-          var buttons = [{
-            label: popupButtonText,
-            accessKey: popupButtonAccesskey,
-            popup: "blockedPopupOptions",
-            callback: null
-          }];
-
-          const priority = notificationBox.PRIORITY_WARNING_MEDIUM;
-          notificationBox.appendNotification(message, "popup-blocked",
-                                             "chrome://browser/skin/notification-icons/popup.svg",
-                                             priority, buttons);
-        }
-      }
-
-      // Record the fact that we've reported this blocked popup, so we don't
-      // show it again.
-      gBrowser.selectedBrowser.blockedPopups.reported = true;
-    }
-  },
-
-  toggleAllowPopupsForSite(aEvent) {
-    var pm = Services.perms;
-    var shouldBlock = aEvent.target.getAttribute("block") == "true";
-    var perm = shouldBlock ? pm.DENY_ACTION : pm.ALLOW_ACTION;
-    pm.addFromPrincipal(gBrowser.contentPrincipal, "popup", perm);
-
-    if (!shouldBlock)
-      this.showAllBlockedPopups(gBrowser.selectedBrowser);
-
-    gBrowser.getNotificationBox().removeCurrentNotification();
-  },
-
-  fillPopupList(aEvent) {
-    // XXXben - rather than using |currentURI| here, which breaks down on multi-framed sites
-    //          we should really walk the blockedPopups and create a list of "allow for <host>"
-    //          menuitems for the common subset of hosts present in the report, this will
-    //          make us frame-safe.
-    //
-    // XXXjst - Note that when this is fixed to work with multi-framed sites,
-    //          also back out the fix for bug 343772 where
-    //          nsGlobalWindow::CheckOpenAllow() was changed to also
-    //          check if the top window's location is whitelisted.
-    let browser = gBrowser.selectedBrowser;
-    var uri = browser.contentPrincipal.URI || browser.currentURI;
-    var blockedPopupAllowSite = document.getElementById("blockedPopupAllowSite");
-    try {
-      blockedPopupAllowSite.removeAttribute("hidden");
-      let uriHost = uri.asciiHost ? uri.host : uri.spec;
-      var pm = Services.perms;
-      if (pm.testPermission(uri, "popup") == pm.ALLOW_ACTION) {
-        // Offer an item to block popups for this site, if a whitelist entry exists
-        // already for it.
-        let blockString = gNavigatorBundle.getFormattedString("popupBlock", [uriHost]);
-        blockedPopupAllowSite.setAttribute("label", blockString);
-        blockedPopupAllowSite.setAttribute("block", "true");
-      } else {
-        // Offer an item to allow popups for this site
-        let allowString = gNavigatorBundle.getFormattedString("popupAllow", [uriHost]);
-        blockedPopupAllowSite.setAttribute("label", allowString);
-        blockedPopupAllowSite.removeAttribute("block");
-      }
-    } catch (e) {
-      blockedPopupAllowSite.setAttribute("hidden", "true");
-    }
-
-    if (PrivateBrowsingUtils.isWindowPrivate(window))
-      blockedPopupAllowSite.setAttribute("disabled", "true");
-    else
-      blockedPopupAllowSite.removeAttribute("disabled");
-
-    let blockedPopupDontShowMessage = document.getElementById("blockedPopupDontShowMessage");
-    let showMessage = Services.prefs.getBoolPref("privacy.popups.showBrowserMessage");
-    blockedPopupDontShowMessage.setAttribute("checked", !showMessage);
-    blockedPopupDontShowMessage.setAttribute("label", gNavigatorBundle.getString("popupWarningDontShowFromMessage"));
-
-    let blockedPopupsSeparator =
-        document.getElementById("blockedPopupsSeparator");
-    blockedPopupsSeparator.setAttribute("hidden", true);
-
-    gBrowser.selectedBrowser.retrieveListOfBlockedPopups().then(blockedPopups => {
-      let foundUsablePopupURI = false;
-      if (blockedPopups) {
-        for (let i = 0; i < blockedPopups.length; i++) {
-          let blockedPopup = blockedPopups[i];
-
-          // popupWindowURI will be null if the file picker popup is blocked.
-          // xxxdz this should make the option say "Show file picker" and do it (Bug 590306)
-          if (!blockedPopup.popupWindowURIspec)
-            continue;
-
-          var popupURIspec = blockedPopup.popupWindowURIspec;
-
-          // Sometimes the popup URI that we get back from the blockedPopup
-          // isn't useful (for instance, netscape.com's popup URI ends up
-          // being "http://www.netscape.com", which isn't really the URI of
-          // the popup they're trying to show).  This isn't going to be
-          // useful to the user, so we won't create a menu item for it.
-          if (popupURIspec == "" || popupURIspec == "about:blank" ||
-              popupURIspec == "<self>" ||
-              popupURIspec == uri.spec)
-            continue;
-
-          // Because of the short-circuit above, we may end up in a situation
-          // in which we don't have any usable popup addresses to show in
-          // the menu, and therefore we shouldn't show the separator.  However,
-          // since we got past the short-circuit, we must've found at least
-          // one usable popup URI and thus we'll turn on the separator later.
-          foundUsablePopupURI = true;
-
-          var menuitem = document.createElement("menuitem");
-          var label = gNavigatorBundle.getFormattedString("popupShowPopupPrefix",
-                                                          [popupURIspec]);
-          menuitem.setAttribute("label", label);
-          menuitem.setAttribute("oncommand", "gPopupBlockerObserver.showBlockedPopup(event);");
-          menuitem.setAttribute("popupReportIndex", i);
-          menuitem.popupReportBrowser = browser;
-          aEvent.target.appendChild(menuitem);
-        }
-      }
-
-      // Show the separator if we added any
-      // showable popup addresses to the menu.
-      if (foundUsablePopupURI)
-        blockedPopupsSeparator.removeAttribute("hidden");
-    }, null);
-  },
-
-  onPopupHiding(aEvent) {
-    let item = aEvent.target.lastChild;
-    while (item && item.getAttribute("observes") != "blockedPopupsSeparator") {
-      let next = item.previousSibling;
-      item.remove();
-      item = next;
-    }
-  },
-
-  showBlockedPopup(aEvent) {
-    var target = aEvent.target;
-    var popupReportIndex = target.getAttribute("popupReportIndex");
-    let browser = target.popupReportBrowser;
-    browser.unblockPopup(popupReportIndex);
-  },
-
-  showAllBlockedPopups(aBrowser) {
-    aBrowser.retrieveListOfBlockedPopups().then(popups => {
-      for (let i = 0; i < popups.length; i++) {
-        if (popups[i].popupWindowURIspec)
-          aBrowser.unblockPopup(i);
-      }
-    }, null);
-  },
-
-  editPopupSettings() {
-    let prefillValue = "";
-    try {
-      // We use contentPrincipal rather than currentURI to get the right
-      // value in case this is a data: URI that's inherited off something else.
-      // Some principals don't have URIs, so fall back in case URI is not present.
-      let principalURI = gBrowser.contentPrincipal.URI || gBrowser.currentURI;
-      if (principalURI) {
-        // asciiHost conveniently doesn't throw.
-        if (principalURI.asciiHost) {
-          prefillValue = principalURI.prePath;
-        } else {
-          // For host-less URIs like file://, prePath would effectively allow
-          // popups everywhere on file://. Use the full spec:
-          prefillValue = principalURI.spec;
-        }
-      }
-    } catch (e) { }
-
-    var bundlePreferences = document.getElementById("bundle_preferences");
-    var params = { blockVisible: false,
-                   sessionVisible: false,
-                   allowVisible: true,
-                   prefilledHost: prefillValue,
-                   permissionType: "popup",
-                   windowTitle: bundlePreferences.getString("popuppermissionstitle2"),
-                   introText: bundlePreferences.getString("popuppermissionstext") };
-    var existingWindow = Services.wm.getMostRecentWindow("Browser:Permissions");
-    if (existingWindow) {
-      existingWindow.initWithParams(params);
-      existingWindow.focus();
-    } else
-      window.openDialog("chrome://browser/content/preferences/permissions.xul",
-                        "_blank", "resizable,dialog=no,centerscreen", params);
-  },
-
-  dontShowMessage() {
-    var showMessage = Services.prefs.getBoolPref("privacy.popups.showBrowserMessage");
-    Services.prefs.setBoolPref("privacy.popups.showBrowserMessage", !showMessage);
-    gBrowser.getNotificationBox().removeCurrentNotification();
-  }
-};
-
-function gKeywordURIFixup({ target: browser, data: fixupInfo }) {
-  let deserializeURI = (spec) => spec ? makeURI(spec) : null;
-
-  // We get called irrespective of whether we did a keyword search, or
-  // whether the original input would be vaguely interpretable as a URL,
-  // so figure that out first.
-  let alternativeURI = deserializeURI(fixupInfo.fixedURI);
-  if (!fixupInfo.keywordProviderName || !alternativeURI || !alternativeURI.host) {
-    return;
-  }
-
-  let contentPrincipal = browser.contentPrincipal;
-
-  // At this point we're still only just about to load this URI.
-  // When the async DNS lookup comes back, we may be in any of these states:
-  // 1) still on the previous URI, waiting for the preferredURI (keyword
-  //    search) to respond;
-  // 2) at the keyword search URI (preferredURI)
-  // 3) at some other page because the user stopped navigation.
-  // We keep track of the currentURI to detect case (1) in the DNS lookup
-  // callback.
-  let previousURI = browser.currentURI;
-  let preferredURI = deserializeURI(fixupInfo.preferredURI);
-
-  // now swap for a weak ref so we don't hang on to browser needlessly
-  // even if the DNS query takes forever
-  let weakBrowser = Cu.getWeakReference(browser);
-  browser = null;
-
-  // Additionally, we need the host of the parsed url
-  let hostName = alternativeURI.displayHost;
-  // and the ascii-only host for the pref:
-  let asciiHost = alternativeURI.asciiHost;
-  // Normalize out a single trailing dot - NB: not using endsWith/lastIndexOf
-  // because we need to be sure this last dot is the *only* dot, too.
-  // More generally, this is used for the pref and should stay in sync with
-  // the code in nsDefaultURIFixup::KeywordURIFixup .
-  if (asciiHost.indexOf(".") == asciiHost.length - 1) {
-    asciiHost = asciiHost.slice(0, -1);
-  }
-
-  let isIPv4Address = host => {
-    let parts = host.split(".");
-    if (parts.length != 4) {
-      return false;
-    }
-    return parts.every(part => {
-      let n = parseInt(part, 10);
-      return n >= 0 && n <= 255;
-    });
-  };
-  // Avoid showing fixup information if we're suggesting an IP. Note that
-  // decimal representations of IPs are normalized to a 'regular'
-  // dot-separated IP address by network code, but that only happens for
-  // numbers that don't overflow. Longer numbers do not get normalized,
-  // but still work to access IP addresses. So for instance,
-  // 1097347366913 (ff7f000001) gets resolved by using the final bytes,
-  // making it the same as 7f000001, which is 127.0.0.1 aka localhost.
-  // While 2130706433 would get normalized by network, 1097347366913
-  // does not, and we have to deal with both cases here:
-  if (isIPv4Address(asciiHost) || /^(?:\d+|0x[a-f0-9]+)$/i.test(asciiHost))
-    return;
-
-  let onLookupComplete = (request, record, status) => {
-    let browserRef = weakBrowser.get();
-    if (!Components.isSuccessCode(status) || !browserRef)
-      return;
-
-    let currentURI = browserRef.currentURI;
-    // If we're in case (3) (see above), don't show an info bar.
-    if (!currentURI.equals(previousURI) &&
-        !currentURI.equals(preferredURI)) {
-      return;
-    }
-
-    // show infobar offering to visit the host
-    let notificationBox = gBrowser.getNotificationBox(browserRef);
-    if (notificationBox.getNotificationWithValue("keyword-uri-fixup"))
-      return;
-
-    let message = gNavigatorBundle.getFormattedString(
-      "keywordURIFixup.message", [hostName]);
-    let yesMessage = gNavigatorBundle.getFormattedString(
-      "keywordURIFixup.goTo", [hostName]);
-
-    let buttons = [
-      {
-        label: yesMessage,
-        accessKey: gNavigatorBundle.getString("keywordURIFixup.goTo.accesskey"),
-        callback() {
-          // Do not set this preference while in private browsing.
-          if (!PrivateBrowsingUtils.isWindowPrivate(window)) {
-            let pref = "browser.fixup.domainwhitelist." + asciiHost;
-            Services.prefs.setBoolPref(pref, true);
-          }
-          openUILinkIn(alternativeURI.spec, "current");
-        }
-      },
-      {
-        label: gNavigatorBundle.getString("keywordURIFixup.dismiss"),
-        accessKey: gNavigatorBundle.getString("keywordURIFixup.dismiss.accesskey"),
-        callback() {
-          let notification = notificationBox.getNotificationWithValue("keyword-uri-fixup");
-          notificationBox.removeNotification(notification, true);
-        }
-      }
-    ];
-    let notification =
-      notificationBox.appendNotification(message, "keyword-uri-fixup", null,
-                                         notificationBox.PRIORITY_INFO_HIGH,
-                                         buttons);
-    notification.persistence = 1;
-  };
-
-  try {
-    gDNSService.asyncResolve(hostName, 0, onLookupComplete, Services.tm.mainThread,
-                             contentPrincipal.originAttributes);
-  } catch (ex) {
-    // Do nothing if the URL is invalid (we don't want to show a notification in that case).
-    if (ex.result != Cr.NS_ERROR_UNKNOWN_HOST) {
-      // ... otherwise, report:
-      Cu.reportError(ex);
-    }
-  }
-}
-
-function serializeInputStream(aStream) {
-  let data = {
-    content: NetUtil.readInputStreamToString(aStream, aStream.available()),
-  };
-
-  if (aStream instanceof Ci.nsIMIMEInputStream) {
-    data.headers = new Map();
-    aStream.visitHeaders((name, value) => {
-      data.headers.set(name, value);
-    });
-  }
-
-  return data;
-}
-
-/**
- * Handles URIs when we want to deal with them in chrome code rather than pass
- * them down to a content browser. This can avoid unnecessary process switching
- * for the browser.
- * @param aBrowser the browser that is attempting to load the URI
- * @param aUri the nsIURI that is being loaded
- * @returns true if the URI is handled, otherwise false
- */
-function handleUriInChrome(aBrowser, aUri) {
-  if (aUri.scheme == "file") {
-    try {
-      let mimeType = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService)
-                                              .getTypeFromURI(aUri);
-      if (mimeType == "application/x-xpinstall") {
-        let systemPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
-        AddonManager.getInstallForURL(aUri.spec, install => {
-          AddonManager.installAddonFromWebpage(mimeType, aBrowser, systemPrincipal,
-                                               install);
-        }, mimeType);
-        return true;
-      }
-    } catch (e) {
-      return false;
-    }
-  }
-
-  return false;
-}
-
-// A shared function used by both remote and non-remote browser XBL bindings to
-// load a URI or redirect it to the correct process.
-function _loadURI(browser, uri, params = {}) {
-  let tab = gBrowser.getTabForBrowser(browser);
-  // Preloaded browsers don't have tabs, so we ignore those.
-  if (tab) {
-    maybeRecordAbandonmentTelemetry(tab, "newURI");
-  }
-
-  if (!uri) {
-    uri = "about:blank";
-  }
-
-  let {
-    flags = Ci.nsIWebNavigation.LOAD_FLAGS_NONE,
-    referrerURI,
-    referrerPolicy = Ci.nsIHttpChannel.REFERRER_POLICY_UNSET,
-    triggeringPrincipal,
-    postData,
-    userContextId,
-  } = params || {};
-
-  let currentRemoteType = browser.remoteType;
-  let requiredRemoteType;
-  try {
-    let fixupFlags = Ci.nsIURIFixup.FIXUP_FLAG_NONE;
-    if (flags & Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP) {
-      fixupFlags |= Ci.nsIURIFixup.FIXUP_FLAG_ALLOW_KEYWORD_LOOKUP;
-    }
-    if (flags & Ci.nsIWebNavigation.LOAD_FLAGS_FIXUP_SCHEME_TYPOS) {
-      fixupFlags |= Ci.nsIURIFixup.FIXUP_FLAG_FIX_SCHEME_TYPOS;
-    }
-    let uriObject = Services.uriFixup.createFixupURI(uri, fixupFlags);
-    if (handleUriInChrome(browser, uriObject)) {
-      // If we've handled the URI in Chrome then just return here.
-      return;
-    }
-
-    // Note that I had thought that we could set uri = uriObject.spec here, to
-    // save on fixup later on, but that changes behavior and breaks tests.
-    requiredRemoteType =
-      E10SUtils.getRemoteTypeForURIObject(uriObject, gMultiProcessBrowser,
-                                          currentRemoteType, browser.currentURI);
-  } catch (e) {
-    // createFixupURI throws if it can't create a URI. If that's the case then
-    // we still need to pass down the uri because docshell handles this case.
-    requiredRemoteType = gMultiProcessBrowser ? E10SUtils.DEFAULT_REMOTE_TYPE
-                                              : E10SUtils.NOT_REMOTE;
-  }
-
-  let mustChangeProcess = requiredRemoteType != currentRemoteType;
-  let newFrameloader = false;
-  if (browser.getAttribute("preloadedState") === "consumed" && uri != "about:newtab") {
-    // Leaving about:newtab from a used to be preloaded browser should run the process
-    // selecting algorithm again.
-    mustChangeProcess = true;
-    newFrameloader = true;
-    browser.removeAttribute("preloadedState");
-  }
-
-  // !requiredRemoteType means we're loading in the parent/this process.
-  if (!requiredRemoteType) {
-    browser.inLoadURI = true;
-  }
-  try {
-    if (!mustChangeProcess) {
-      if (userContextId) {
-        browser.webNavigation.setOriginAttributesBeforeLoading({ userContextId });
-      }
-
-      browser.webNavigation.loadURIWithOptions(uri, flags,
-                                               referrerURI, referrerPolicy,
-                                               postData, null, null, triggeringPrincipal);
-    } else {
-      // Check if the current browser is allowed to unload.
-      let {permitUnload, timedOut} = browser.permitUnload();
-      if (!timedOut && !permitUnload) {
-        return;
-      }
-
-      if (postData) {
-        postData = serializeInputStream(postData);
-      }
-
-      let loadParams = {
-        uri,
-        triggeringPrincipal: triggeringPrincipal
-          ? gSerializationHelper.serializeToString(triggeringPrincipal)
-          : null,
-        flags,
-        referrer: referrerURI ? referrerURI.spec : null,
-        referrerPolicy,
-        remoteType: requiredRemoteType,
-        postData,
-        newFrameloader,
-      };
-
-      if (userContextId) {
-        loadParams.userContextId = userContextId;
-      }
-
-      LoadInOtherProcess(browser, loadParams);
-    }
-  } catch (e) {
-    // If anything goes wrong when switching remoteness, just switch remoteness
-    // manually and load the URI.
-    // We might lose history that way but at least the browser loaded a page.
-    // This might be necessary if SessionStore wasn't initialized yet i.e.
-    // when the homepage is a non-remote page.
-    if (mustChangeProcess) {
-      Cu.reportError(e);
-      gBrowser.updateBrowserRemotenessByURL(browser, uri);
-
-      if (userContextId) {
-        browser.webNavigation.setOriginAttributesBeforeLoading({ userContextId });
-      }
-
-      browser.webNavigation.loadURIWithOptions(uri, flags, referrerURI, referrerPolicy,
-                                               postData, null, null, triggeringPrincipal);
-    } else {
-      throw e;
-    }
-  } finally {
-    if (!requiredRemoteType) {
-      browser.inLoadURI = false;
-    }
-  }
-}
-
-// Starts a new load in the browser first switching the browser to the correct
-// process
-function LoadInOtherProcess(browser, loadOptions, historyIndex = -1) {
-  let tab = gBrowser.getTabForBrowser(browser);
-  SessionStore.navigateAndRestore(tab, loadOptions, historyIndex);
-}
-
-// Called when a docshell has attempted to load a page in an incorrect process.
-// This function is responsible for loading the page in the correct process.
-function RedirectLoad({ target: browser, data }) {
-  if (browser.getAttribute("preloadedState") === "consumed") {
-    browser.removeAttribute("preloadedState");
-    data.loadOptions.newFrameloader = true;
-  }
-
-  if (data.loadOptions.reloadInFreshProcess) {
-    // Convert the fresh process load option into a large allocation remote type
-    // to use common processing from this point.
-    data.loadOptions.remoteType = E10SUtils.LARGE_ALLOCATION_REMOTE_TYPE;
-    data.loadOptions.newFrameloader = true;
-  } else if (browser.remoteType == E10SUtils.LARGE_ALLOCATION_REMOTE_TYPE) {
-    // If we're in a Large-Allocation process, we prefer switching back into a
-    // normal content process, as that way we can clean up the L-A process.
-    data.loadOptions.remoteType =
-      E10SUtils.getRemoteTypeForURI(data.loadOptions.uri, gMultiProcessBrowser);
-  }
-
-  // We should only start the redirection if the browser window has finished
-  // starting up. Otherwise, we should wait until the startup is done.
-  if (gBrowserInit.delayedStartupFinished) {
-    LoadInOtherProcess(browser, data.loadOptions, data.historyIndex);
-  } else {
-    let delayedStartupFinished = (subject, topic) => {
-      if (topic == "browser-delayed-startup-finished" &&
-          subject == window) {
-        Services.obs.removeObserver(delayedStartupFinished, topic);
-        LoadInOtherProcess(browser, data.loadOptions, data.historyIndex);
-      }
-    };
-    Services.obs.addObserver(delayedStartupFinished,
-                             "browser-delayed-startup-finished");
-  }
-}
-
-if (document.documentElement.getAttribute("windowtype") == "navigator:browser") {
-  window.addEventListener("MozBeforeInitialXULLayout", () => {
-    gBrowserInit.onBeforeInitialXULLayout();
-  }, { once: true });
-  // The listener of DOMContentLoaded must be set on window, rather than
-  // document, because the window can go away before the event is fired.
-  // In that case, we don't want to initialize anything, otherwise we
-  // may be leaking things because they will never be destroyed after.
-  window.addEventListener("DOMContentLoaded", () => {
-    gBrowserInit.onDOMContentLoaded();
-  }, { once: true });
-}
-
-let _resolveDelayedStartup;
-var delayedStartupPromise = new Promise(resolve => {
-  _resolveDelayedStartup = resolve;
-});
-
-var gBrowserInit = {
-  delayedStartupFinished: false,
-
-  onBeforeInitialXULLayout() {
-    // Set a sane starting width/height for all resolutions on new profiles.
-    if (Services.prefs.getBoolPref("privacy.resistFingerprinting")) {
-      // When the fingerprinting resistance is enabled, making sure that we don't
-      // have a maximum window to interfere with generating rounded window dimensions.
-      document.documentElement.setAttribute("sizemode", "normal");
-    } else if (!document.documentElement.hasAttribute("width")) {
-      const TARGET_WIDTH = 1280;
-      const TARGET_HEIGHT = 1040;
-      let width = Math.min(screen.availWidth * .9, TARGET_WIDTH);
-      let height = Math.min(screen.availHeight * .9, TARGET_HEIGHT);
-
-      document.documentElement.setAttribute("width", width);
-      document.documentElement.setAttribute("height", height);
-
-      if (width < TARGET_WIDTH && height < TARGET_HEIGHT) {
-        document.documentElement.setAttribute("sizemode", "maximized");
-      }
-    }
-
-    // Update the chromemargin attribute so the window can be sized correctly.
-    window.TabBarVisibility.update();
-    TabsInTitlebar.init();
-
-    new LightweightThemeConsumer(document);
-    CompactTheme.init();
-    if (window.matchMedia("(-moz-os-version: windows-win8)").matches &&
-        window.matchMedia("(-moz-windows-default-theme)").matches) {
-      let windowFrameColor = new Color(...ChromeUtils.import("resource:///modules/Windows8WindowFrameColor.jsm", {})
-                                            .Windows8WindowFrameColor.get());
-      // Default to black for foreground text.
-      if (!windowFrameColor.isContrastRatioAcceptable(new Color(0, 0, 0))) {
-        document.documentElement.setAttribute("darkwindowframe", "true");
-      }
-    }
-    ToolbarIconColor.init();
-  },
-
-  onDOMContentLoaded() {
-    gBrowser = window._gBrowser;
-    delete window._gBrowser;
-    gBrowser.init();
-
-    window.QueryInterface(Ci.nsIInterfaceRequestor)
-          .getInterface(Ci.nsIWebNavigation)
-          .QueryInterface(Ci.nsIDocShellTreeItem).treeOwner
-          .QueryInterface(Ci.nsIInterfaceRequestor)
-          .getInterface(Ci.nsIXULWindow)
-          .XULBrowserWindow = window.XULBrowserWindow;
-    window.QueryInterface(Ci.nsIDOMChromeWindow).browserDOMWindow =
-      new nsBrowserAccess();
-
-    let initBrowser = gBrowser.initialBrowser;
-
-    // remoteType and sameProcessAsFrameLoader are passed through to
-    // updateBrowserRemoteness as part of an options object, which itself defaults
-    // to an empty object. So defaulting them to undefined here will cause the
-    // default behavior in updateBrowserRemoteness if they don't get set.
-    let isRemote = gMultiProcessBrowser;
-    let remoteType;
-    let sameProcessAsFrameLoader;
-
-    let tabArgument = window.arguments && window.arguments[0];
-    if (tabArgument instanceof XULElement) {
-      // The window's first argument is a tab if and only if we are swapping tabs.
-      // We must set the browser's usercontextid before updateBrowserRemoteness(),
-      // so that the newly created remote tab child has the correct usercontextid.
-      if (tabArgument.hasAttribute("usercontextid")) {
-        initBrowser.setAttribute("usercontextid",
-                                 tabArgument.getAttribute("usercontextid"));
-      }
-
-      let linkedBrowser = tabArgument.linkedBrowser;
-      if (linkedBrowser) {
-        remoteType = linkedBrowser.remoteType;
-        isRemote = remoteType != E10SUtils.NOT_REMOTE;
-        sameProcessAsFrameLoader = linkedBrowser.frameLoader;
-      }
-      initBrowser.removeAttribute("blank");
-    }
-
-    gBrowser.updateBrowserRemoteness(initBrowser, isRemote, {
-      remoteType, sameProcessAsFrameLoader
-    });
-
-    // Hack to ensure that the about:home favicon is loaded
-    // instantaneously, to avoid flickering and improve perceived performance.
-    this._callWithURIToLoad(uriToLoad => {
-      if (uriToLoad == "about:home") {
-        gBrowser.setIcon(gBrowser.selectedTab, "chrome://branding/content/icon32.png");
-      } else if (uriToLoad == "about:privatebrowsing") {
-        gBrowser.setIcon(gBrowser.selectedTab, "chrome://browser/skin/privatebrowsing/favicon.svg");
-      }
-    });
-
-    this._setInitialFocus();
-
-    // Update the UI density before TabsInTitlebar lays out the titlbar.
-    gUIDensity.init();
-    TabsInTitlebar.whenWindowLayoutReady();
-  },
-
-  onLoad() {
-    gBrowser.addEventListener("DOMUpdateBlockedPopups", gPopupBlockerObserver);
-
-    Services.obs.addObserver(gPluginHandler.NPAPIPluginCrashed, "plugin-crashed");
-
-    window.addEventListener("AppCommand", HandleAppCommandEvent, true);
-
-    // These routines add message listeners. They must run before
-    // loading the frame script to ensure that we don't miss any
-    // message sent between when the frame script is loaded and when
-    // the listener is registered.
-    DOMEventHandler.init();
-    gPageStyleMenu.init();
-    LanguageDetectionListener.init();
-    BrowserOnClick.init();
-    FeedHandler.init();
-    AboutCapabilitiesListener.init();
-    TrackingProtection.init();
-    CaptivePortalWatcher.init();
-    ZoomUI.init(window);
-
-    let mm = window.getGroupMessageManager("browsers");
-    mm.loadFrameScript("chrome://browser/content/tab-content.js", true);
-    mm.loadFrameScript("chrome://browser/content/content.js", true);
-    mm.loadFrameScript("chrome://browser/content/content-UITour.js", true);
-    mm.loadFrameScript("chrome://global/content/content-HybridContentTelemetry.js", true);
-    mm.loadFrameScript("chrome://global/content/manifestMessages.js", true);
-
-    window.messageManager.addMessageListener("Browser:LoadURI", RedirectLoad);
-
-    if (!gMultiProcessBrowser) {
-      // There is a Content:Click message manually sent from content.
-      Services.els.addSystemEventListener(gBrowser.tabpanels, "click",
-        contentAreaClick, true);
-    }
-
-    // hook up UI through progress listener
-    gBrowser.addProgressListener(window.XULBrowserWindow);
-    gBrowser.addTabsProgressListener(window.TabsProgressListener);
-
-    SidebarUI.init();
-
-    // We do this in onload because we want to ensure the button's state
-    // doesn't flicker as the window is being shown.
-    DownloadsButton.init();
-
-    // Certain kinds of automigration rely on this notification to complete
-    // their tasks BEFORE the browser window is shown. SessionStore uses it to
-    // restore tabs into windows AFTER important parts like gMultiProcessBrowser
-    // have been initialized.
-    Services.obs.notifyObservers(window, "browser-window-before-show");
-
-    if (!window.toolbar.visible) {
-      // adjust browser UI for popups
-      gURLBar.setAttribute("readonly", "true");
-    }
-
-    // Misc. inits.
-    TabletModeUpdater.init();
-    CombinedStopReload.ensureInitialized();
-    gPrivateBrowsingUI.init();
-    BrowserSearch.init();
-    BrowserPageActions.init();
-    gAccessibilityServiceIndicator.init();
-
-    gRemoteControl.updateVisualCue(Marionette.running);
-
-    // If we are given a tab to swap in, take care of it before first paint to
-    // avoid an about:blank flash.
-    let tabToOpen = window.arguments && window.arguments[0];
-    if (tabToOpen instanceof XULElement) {
-      // Clear the reference to the tab from the arguments array.
-      window.arguments[0] = null;
-
-      // Stop the about:blank load
-      gBrowser.stop();
-      // make sure it has a docshell
-      gBrowser.docShell;
-
-      try {
-        gBrowser.swapBrowsersAndCloseOther(gBrowser.selectedTab, tabToOpen);
-      } catch (e) {
-        Cu.reportError(e);
-      }
-    }
-
-    // Wait until chrome is painted before executing code not critical to making the window visible
-    this._boundDelayedStartup = this._delayedStartup.bind(this);
-    window.addEventListener("MozAfterPaint", this._boundDelayedStartup);
-
-    if (!PrivateBrowsingUtils.enabled) {
-      document.getElementById("Tools:PrivateBrowsing").hidden = true;
-      // Setting disabled doesn't disable the shortcut, so we just remove
-      // the keybinding.
-      document.getElementById("key_privatebrowsing").remove();
-    }
-
-    this._loadHandled = true;
-  },
-
-  _cancelDelayedStartup() {
-    window.removeEventListener("MozAfterPaint", this._boundDelayedStartup);
-    this._boundDelayedStartup = null;
-  },
-
-  _delayedStartup() {
-    let { TelemetryTimestamps } =
-      ChromeUtils.import("resource://gre/modules/TelemetryTimestamps.jsm", {});
-    TelemetryTimestamps.add("delayedStartupStarted");
-
-    this._cancelDelayedStartup();
-
-    // We need to set the OfflineApps message listeners up before we
-    // load homepages, which might need them.
-    OfflineApps.init();
-
-    // This pageshow listener needs to be registered before we may call
-    // swapBrowsersAndCloseOther() to receive pageshow events fired by that.
-    window.messageManager.addMessageListener("PageVisibility:Show", function(message) {
-      if (message.target == gBrowser.selectedBrowser) {
-        setTimeout(pageShowEventHandlers, 0, message.data.persisted);
-      }
-    });
-
-    gBrowser.addEventListener("AboutTabCrashedLoad", function(event) {
-      let ownerDoc = event.originalTarget;
-
-      if (!ownerDoc.documentURI.startsWith("about:tabcrashed")) {
-        return;
-      }
-
-      let browser = gBrowser.getBrowserForDocument(event.target);
-      // Reset the zoom for the tabcrashed page.
-      ZoomManager.setZoomForBrowser(browser, 1);
-    }, false, true);
-
-    gBrowser.addEventListener("InsecureLoginFormsStateChange", function() {
-      gIdentityHandler.refreshForInsecureLoginForms();
-    }, true);
-
-    gBrowser.addEventListener("PermissionStateChange", function() {
-      gIdentityHandler.refreshIdentityBlock();
-    }, true);
-
-    // Get the service so that it initializes and registers listeners for new
-    // tab pages in order to be ready for any early-loading about:newtab pages,
-    // e.g., start/home page, command line / startup uris to load, sessionstore
-    gAboutNewTabService.QueryInterface(Ci.nsISupports);
-
-    this._handleURIToLoad();
-
-    Services.obs.addObserver(gIdentityHandler, "perm-changed");
-    Services.obs.addObserver(gRemoteControl, "remote-active");
-    Services.obs.addObserver(gSessionHistoryObserver, "browser:purge-session-history");
-    Services.obs.addObserver(gStoragePressureObserver, "QuotaManager::StoragePressure");
-    Services.obs.addObserver(gXPInstallObserver, "addon-install-disabled");
-    Services.obs.addObserver(gXPInstallObserver, "addon-install-started");
-    Services.obs.addObserver(gXPInstallObserver, "addon-install-blocked");
-    Services.obs.addObserver(gXPInstallObserver, "addon-install-origin-blocked");
-    Services.obs.addObserver(gXPInstallObserver, "addon-install-failed");
-    Services.obs.addObserver(gXPInstallObserver, "addon-install-confirmation");
-    Services.obs.addObserver(gXPInstallObserver, "addon-install-complete");
-    window.messageManager.addMessageListener("Browser:URIFixup", gKeywordURIFixup);
-
-    BrowserOffline.init();
-    IndexedDBPromptHelper.init();
-    CanvasPermissionPromptHelper.init();
-    WebAuthnPromptHelper.init();
-
-    // Initialize the full zoom setting.
-    // We do this before the session restore service gets initialized so we can
-    // apply full zoom settings to tabs restored by the session restore service.
-    FullZoom.init();
-    PanelUI.init();
-
-    UpdateUrlbarSearchSplitterState();
-
-    BookmarkingUI.init();
-    AutoShowBookmarksToolbar.init();
-
-    Services.prefs.addObserver(gHomeButton.prefDomain, gHomeButton);
-
-    var homeButton = document.getElementById("home-button");
-    gHomeButton.updateTooltip(homeButton);
-
-    let safeMode = document.getElementById("helpSafeMode");
-    if (Services.appinfo.inSafeMode) {
-      safeMode.label = safeMode.getAttribute("stoplabel");
-      safeMode.accesskey = safeMode.getAttribute("stopaccesskey");
-    }
-
-    // BiDi UI
-    gBidiUI = isBidiEnabled();
-    if (gBidiUI) {
-      document.getElementById("documentDirection-separator").hidden = false;
-      document.getElementById("documentDirection-swap").hidden = false;
-      document.getElementById("textfieldDirection-separator").hidden = false;
-      document.getElementById("textfieldDirection-swap").hidden = false;
-    }
-
-    // Setup click-and-hold gestures access to the session history
-    // menus if global click-and-hold isn't turned on
-    if (!getBoolPref("ui.click_hold_context_menus", false))
-      SetClickAndHoldHandlers();
-
-    ChromeUtils.import("resource:///modules/UpdateTopLevelContentWindowIDHelper.jsm", {})
-      .trackBrowserWindow(window);
-
-    PlacesToolbarHelper.init();
-
-    ctrlTab.readPref();
-    Services.prefs.addObserver(ctrlTab.prefName, ctrlTab);
-
-    // 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();
-
-    if (AppConstants.platform != "macosx") {
-      updateEditUIVisibility();
-      let placesContext = document.getElementById("placesContext");
-      placesContext.addEventListener("popupshowing", updateEditUIVisibility);
-      placesContext.addEventListener("popuphiding", updateEditUIVisibility);
-    }
-
-    LightWeightThemeWebInstaller.init();
-
-    if (Win7Features)
-      Win7Features.onOpenWindow();
-
-    FullScreen.init();
-    PointerLock.init();
-
-    if (AppConstants.isPlatformAndVersionAtLeast("win", "10")) {
-      MenuTouchModeObserver.init();
-    }
-
-    if (AppConstants.MOZ_DATA_REPORTING)
-      gDataNotificationInfoBar.init();
-
-    if (!AppConstants.MOZILLA_OFFICIAL)
-      DevelopmentHelpers.init();
-
-    gExtensionsNotifications.init();
-
-    let wasMinimized = window.windowState == window.STATE_MINIMIZED;
-    window.addEventListener("sizemodechange", () => {
-      let isMinimized = window.windowState == window.STATE_MINIMIZED;
-      if (wasMinimized != isMinimized) {
-        wasMinimized = isMinimized;
-        UpdatePopupNotificationsVisibility();
-      }
-    });
-
-    window.addEventListener("mousemove", MousePosTracker);
-    window.addEventListener("dragover", MousePosTracker);
-
-    gNavToolbox.addEventListener("customizationstarting", CustomizationHandler);
-    gNavToolbox.addEventListener("customizationending", CustomizationHandler);
-
-    if (AppConstants.platform == "linux") {
-      let { WindowDraggingElement } =
-        ChromeUtils.import("resource://gre/modules/WindowDraggingUtils.jsm", {});
-      new WindowDraggingElement(document.getElementById("titlebar"));
-    }
-
-    SessionStore.promiseInitialized.then(() => {
-      // Bail out if the window has been closed in the meantime.
-      if (window.closed) {
-        return;
-      }
-
-      // Enable the Restore Last Session command if needed
-      RestoreLastSessionObserver.init();
-
-      SidebarUI.startDelayedLoad();
-
-      PanicButtonNotifier.init();
-    });
-
-    gBrowser.tabContainer.addEventListener("TabSelect", gURLBar);
-
-    gBrowser.tabContainer.addEventListener("TabSelect", function() {
-      for (let panel of document.querySelectorAll("panel[tabspecific='true']")) {
-        if (panel.state == "open") {
-          panel.hidePopup();
-        }
-      }
-    });
-
-    this.delayedStartupFinished = true;
-
-    _resolveDelayedStartup();
-
-    SessionStore.promiseAllWindowsRestored.then(() => {
-      this._schedulePerWindowIdleTasks();
-      document.documentElement.setAttribute("sessionrestored", "true");
-    });
-
-    Services.obs.notifyObservers(window, "browser-delayed-startup-finished");
-    TelemetryTimestamps.add("delayedStartupFinished");
-  },
-
-  _setInitialFocus() {
-    let initiallyFocusedElement = document.commandDispatcher.focusedElement;
-
-    let firstBrowserPaintDeferred = {};
-    firstBrowserPaintDeferred.promise = new Promise(resolve => {
-      firstBrowserPaintDeferred.resolve = resolve;
-    });
-
-    let mm = window.messageManager;
-    mm.addMessageListener("Browser:FirstPaint", function onFirstPaint() {
-      mm.removeMessageListener("Browser:FirstPaint", onFirstPaint);
-      firstBrowserPaintDeferred.resolve();
-    });
-
-    let initialBrowser = gBrowser.selectedBrowser;
-    mm.addMessageListener("Browser:FirstNonBlankPaint",
-                          function onFirstNonBlankPaint() {
-      mm.removeMessageListener("Browser:FirstNonBlankPaint", onFirstNonBlankPaint);
-      initialBrowser.removeAttribute("blank");
-    });
-
-    // To prevent flickering of the urlbar-history-dropmarker in the general
-    // case, the urlbar has the 'focused' attribute set by default.
-    // If we are not fully sure the urlbar will be focused in this window,
-    // we should remove the attribute before first paint.
-    let shouldRemoveFocusedAttribute = true;
-    this._callWithURIToLoad(uriToLoad => {
-      if ((isBlankPageURL(uriToLoad) || uriToLoad == "about:privatebrowsing") &&
-          focusAndSelectUrlBar()) {
-        shouldRemoveFocusedAttribute = false;
-        return;
-      }
-
-      if (gBrowser.selectedBrowser.isRemoteBrowser) {
-        // If the initial browser is remote, in order to optimize for first paint,
-        // we'll defer switching focus to that browser until it has painted.
-        firstBrowserPaintDeferred.promise.then(() => {
-          // If focus didn't move while we were waiting for first paint, we're okay
-          // to move to the browser.
-          if (document.commandDispatcher.focusedElement == initiallyFocusedElement) {
-            gBrowser.selectedBrowser.focus();
-          }
-        });
-      } else {
-        // If the initial browser is not remote, we can focus the browser
-        // immediately with no paint performance impact.
-        gBrowser.selectedBrowser.focus();
-      }
-    });
-    // Delay removing the attribute using requestAnimationFrame to avoid
-    // invalidating styles multiple times in a row if _uriToLoadPromise
-    // resolves before first paint.
-    if (shouldRemoveFocusedAttribute) {
-      window.requestAnimationFrame(() => {
-        if (shouldRemoveFocusedAttribute)
-          gURLBar.removeAttribute("focused");
-      });
-    }
-  },
-
-  _handleURIToLoad() {
-    this._callWithURIToLoad(uriToLoad => {
-      if (!uriToLoad || uriToLoad == "about:blank") {
-        return;
-      }
-
-      // We don't check if uriToLoad is a XULElement because this case has
-      // already been handled before first paint, and the argument cleared.
-      if (uriToLoad instanceof Ci.nsIArray) {
-        let count = uriToLoad.length;
-        let specs = [];
-        for (let i = 0; i < count; i++) {
-          let urisstring = uriToLoad.queryElementAt(i, Ci.nsISupportsString);
-          specs.push(urisstring.data);
-        }
-
-        // This function throws for certain malformed URIs, so use exception handling
-        // so that we don't disrupt startup
-        try {
-          gBrowser.loadTabs(specs, {
-            inBackground: false,
-            replace: true,
-            triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
-          });
-        } catch (e) {}
-      } else if (window.arguments.length >= 3) {
-        // window.arguments[2]: referrer (nsIURI | string)
-        //                 [3]: postData (nsIInputStream)
-        //                 [4]: allowThirdPartyFixup (bool)
-        //                 [5]: referrerPolicy (int)
-        //                 [6]: userContextId (int)
-        //                 [7]: originPrincipal (nsIPrincipal)
-        //                 [8]: triggeringPrincipal (nsIPrincipal)
-        let referrerURI = window.arguments[2];
-        if (typeof(referrerURI) == "string") {
-          try {
-            referrerURI = makeURI(referrerURI);
-          } catch (e) {
-            referrerURI = null;
-          }
-        }
-        let referrerPolicy = (window.arguments[5] != undefined ?
-            window.arguments[5] : Ci.nsIHttpChannel.REFERRER_POLICY_UNSET);
-        let userContextId = (window.arguments[6] != undefined ?
-            window.arguments[6] : Ci.nsIScriptSecurityManager.DEFAULT_USER_CONTEXT_ID);
-        loadURI(uriToLoad, referrerURI, window.arguments[3] || null,
-                window.arguments[4] || false, referrerPolicy, userContextId,
-                // pass the origin principal (if any) and force its use to create
-                // an initial about:blank viewer if present:
-                window.arguments[7], !!window.arguments[7], window.arguments[8]);
-        window.focus();
-      } else {
-        // Note: loadOneOrMoreURIs *must not* be called if window.arguments.length >= 3.
-        // Such callers expect that window.arguments[0] is handled as a single URI.
-        loadOneOrMoreURIs(uriToLoad, Services.scriptSecurityManager.getSystemPrincipal());
-      }
-    });
-  },
-
-  /**
-   * 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();
-        ChromeUtils.import("resource:///modules/DownloadsTaskbar.jsm", {})
-          .DownloadsTaskbar.registerIndicator(window);
-      } catch (ex) {
-        Cu.reportError(ex);
-      }
-    }, {timeout: 10000});
-  },
-
-  // Returns the URI(s) to load at startup if it is immediately known, or a
-  // promise resolving to the URI to load.
-  get _uriToLoadPromise() {
-    delete this._uriToLoadPromise;
-    return this._uriToLoadPromise = function() {
-      // window.arguments[0]: URI to load (string), or an nsIArray of
-      //                      nsISupportsStrings to load, or a xul:tab of
-      //                      a tabbrowser, which will be replaced by this
-      //                      window (for this case, all other arguments are
-      //                      ignored).
-      if (!window.arguments || !window.arguments[0]) {
-        return null;
-      }
-
-      let uri = window.arguments[0];
-      let defaultArgs = Cc["@mozilla.org/browser/clh;1"]
-                          .getService(Ci.nsIBrowserHandler)
-                          .defaultArgs;
-
-      // If the given URI is different from the homepage, we want to load it.
-      if (uri != defaultArgs) {
-        return uri;
-      }
-
-      // The URI appears to be the the homepage. We want to load it only if
-      // session restore isn't about to override the homepage.
-      let willOverride = SessionStartup.willOverrideHomepage;
-      if (typeof willOverride == "boolean") {
-        return willOverride ? null : uri;
-      }
-      return willOverride.then(willOverrideHomepage =>
-                                 willOverrideHomepage ? null : uri);
-    }();
-  },
-
-  // Calls the given callback with the URI to load at startup.
-  // Synchronously if possible, or after _uriToLoadPromise resolves otherwise.
-  _callWithURIToLoad(callback) {
-    let uriToLoad = this._uriToLoadPromise;
-    if (!uriToLoad || !uriToLoad.then)
-      callback(uriToLoad);
-    else
-      uriToLoad.then(callback);
-  },
-
-  onUnload() {
-    gUIDensity.uninit();
-
-    TabsInTitlebar.uninit();
-
-    ToolbarIconColor.uninit();
-
-    CompactTheme.uninit();
-
-    // In certain scenarios it's possible for unload to be fired before onload,
-    // (e.g. if the window is being closed after browser.js loads but before the
-    // load completes). In that case, there's nothing to do here.
-    if (!this._loadHandled)
-      return;
-
-    // First clean up services initialized in gBrowserInit.onLoad (or those whose
-    // uninit methods don't depend on the services having been initialized).
-
-    CombinedStopReload.uninit();
-
-    gGestureSupport.init(false);
-
-    gHistorySwipeAnimation.uninit();
-
-    FullScreen.uninit();
-
-    gSync.uninit();
-
-    gExtensionsNotifications.uninit();
-
-    Services.obs.removeObserver(gPluginHandler.NPAPIPluginCrashed, "plugin-crashed");
-
-    try {
-      gBrowser.removeProgressListener(window.XULBrowserWindow);
-      gBrowser.removeTabsProgressListener(window.TabsProgressListener);
-    } catch (ex) {
-    }
-
-    PlacesToolbarHelper.uninit();
-
-    BookmarkingUI.uninit();
-
-    TabletModeUpdater.uninit();
-
-    gTabletModePageCounter.finish();
-
-    BrowserOnClick.uninit();
-
-    FeedHandler.uninit();
-
-    AboutCapabilitiesListener.uninit();
-
-    TrackingProtection.uninit();
-
-    CaptivePortalWatcher.uninit();
-
-    SidebarUI.uninit();
-
-    DownloadsButton.uninit();
-
-    gAccessibilityServiceIndicator.uninit();
-
-    LanguagePrompt.uninit();
-
-    BrowserSearch.uninit();
-
-    // Now either cancel delayedStartup, or clean up the services initialized from
-    // it.
-    if (this._boundDelayedStartup) {
-      this._cancelDelayedStartup();
-    } else {
-      if (Win7Features)
-        Win7Features.onCloseWindow();
-
-      Services.prefs.removeObserver(ctrlTab.prefName, ctrlTab);
-      ctrlTab.uninit();
-      gBrowserThumbnails.uninit();
-      FullZoom.destroy();
-
-      Services.obs.removeObserver(gIdentityHandler, "perm-changed");
-      Services.obs.removeObserver(gRemoteControl, "remote-active");
-      Services.obs.removeObserver(gSessionHistoryObserver, "browser:purge-session-history");
-      Services.obs.removeObserver(gStoragePressureObserver, "QuotaManager::StoragePressure");
-      Services.obs.removeObserver(gXPInstallObserver, "addon-install-disabled");
-      Services.obs.removeObserver(gXPInstallObserver, "addon-install-started");
-      Services.obs.removeObserver(gXPInstallObserver, "addon-install-blocked");
-      Services.obs.removeObserver(gXPInstallObserver, "addon-install-origin-blocked");
-      Services.obs.removeObserver(gXPInstallObserver, "addon-install-failed");
-      Services.obs.removeObserver(gXPInstallObserver, "addon-install-confirmation");
-      Services.obs.removeObserver(gXPInstallObserver, "addon-install-complete");
-      window.messageManager.removeMessageListener("Browser:URIFixup", gKeywordURIFixup);
-      window.messageManager.removeMessageListener("Browser:LoadURI", RedirectLoad);
-
-      try {
-        Services.prefs.removeObserver(gHomeButton.prefDomain, gHomeButton);
-      } catch (ex) {
-        Cu.reportError(ex);
-      }
-
-      if (AppConstants.isPlatformAndVersionAtLeast("win", "10")) {
-        MenuTouchModeObserver.uninit();
-      }
-      BrowserOffline.uninit();
-      IndexedDBPromptHelper.uninit();
-      CanvasPermissionPromptHelper.uninit();
-      WebAuthnPromptHelper.uninit();
-      PanelUI.uninit();
-      AutoShowBookmarksToolbar.uninit();
-    }
-
-    // Final window teardown, do this last.
-    gBrowser.destroy();
-    window.XULBrowserWindow = null;
-    window.QueryInterface(Ci.nsIInterfaceRequestor)
-          .getInterface(Ci.nsIWebNavigation)
-          .QueryInterface(Ci.nsIDocShellTreeItem).treeOwner
-          .QueryInterface(Ci.nsIInterfaceRequestor)
-          .getInterface(Ci.nsIXULWindow)
-          .XULBrowserWindow = null;
-    window.QueryInterface(Ci.nsIDOMChromeWindow).browserDOMWindow = null;
-  },
-};
-
-if (AppConstants.platform == "macosx") {
-  // nonBrowserWindowStartup(), nonBrowserWindowDelayedStartup(), and
-  // nonBrowserWindowShutdown() are used for non-browser windows in
-  // macWindow.inc.xul
-  gBrowserInit.nonBrowserWindowStartup = function() {
-    // Disable inappropriate commands / submenus
-    var disabledItems = ["Browser:SavePage",
-                         "Browser:SendLink", "cmd_pageSetup", "cmd_print", "cmd_find", "cmd_findAgain",
-                         "viewToolbarsMenu", "viewSidebarMenuMenu", "Browser:Reload",
-                         "viewFullZoomMenu", "pageStyleMenu", "charsetMenu", "View:PageSource", "View:FullScreen",
-                         "viewHistorySidebar", "Browser:AddBookmarkAs", "Browser:BookmarkAllTabs",
-                         "View:PageInfo"];
-    var element;
-
-    for (let disabledItem of disabledItems) {
-      element = document.getElementById(disabledItem);
-      if (element)
-        element.setAttribute("disabled", "true");
-    }
-
-    // If no windows are active (i.e. we're the hidden window), disable the close, minimize
-    // and zoom menu commands as well
-    if (window.location.href == "chrome://browser/content/hiddenWindow.xul") {
-      var hiddenWindowDisabledItems = ["cmd_close", "minimizeWindow", "zoomWindow"];
-      for (let hiddenWindowDisabledItem of hiddenWindowDisabledItems) {
-        element = document.getElementById(hiddenWindowDisabledItem);
-        if (element)
-          element.setAttribute("disabled", "true");
-      }
-
-      // also hide the window-list separator
-      element = document.getElementById("sep-window-list");
-      element.setAttribute("hidden", "true");
-
-      // Setup the dock menu.
-      let dockMenuElement = document.getElementById("menu_mac_dockmenu");
-      if (dockMenuElement != null) {
-        let nativeMenu = Cc["@mozilla.org/widget/standalonenativemenu;1"]
-                         .createInstance(Ci.nsIStandaloneNativeMenu);
-
-        try {
-          nativeMenu.init(dockMenuElement);
-
-          let dockSupport = Cc["@mozilla.org/widget/macdocksupport;1"]
-                            .getService(Ci.nsIMacDockSupport);
-          dockSupport.dockMenu = nativeMenu;
-        } catch (e) {
-        }
-      }
-    }
-
-    if (PrivateBrowsingUtils.permanentPrivateBrowsing) {
-      document.getElementById("macDockMenuNewWindow").hidden = true;
-    }
-    if (!PrivateBrowsingUtils.enabled) {
-      document.getElementById("macDockMenuNewPrivateWindow").hidden = true;
-    }
-
-    this._delayedStartupTimeoutId = setTimeout(this.nonBrowserWindowDelayedStartup.bind(this), 0);
-  };
-
-  gBrowserInit.nonBrowserWindowDelayedStartup = function() {
-    this._delayedStartupTimeoutId = null;
-
-    // initialise the offline listener
-    BrowserOffline.init();
-
-    // initialize the private browsing UI
-    gPrivateBrowsingUI.init();
-
-  };
-
-  gBrowserInit.nonBrowserWindowShutdown = function() {
-    let dockSupport = Cc["@mozilla.org/widget/macdocksupport;1"]
-                      .getService(Ci.nsIMacDockSupport);
-    dockSupport.dockMenu = null;
-
-    // If nonBrowserWindowDelayedStartup hasn't run yet, we have no work to do -
-    // just cancel the pending timeout and return;
-    if (this._delayedStartupTimeoutId) {
-      clearTimeout(this._delayedStartupTimeoutId);
-      return;
-    }
-
-    BrowserOffline.uninit();
-  };
-}
-
-function HandleAppCommandEvent(evt) {
-  switch (evt.command) {
-  case "Back":
-    BrowserBack();
-    break;
-  case "Forward":
-    BrowserForward();
-    break;
-  case "Reload":
-    BrowserReloadSkipCache();
-    break;
-  case "Stop":
-    if (XULBrowserWindow.stopCommand.getAttribute("disabled") != "true")
-      BrowserStop();
-    break;
-  case "Search":
-    BrowserSearch.webSearch();
-    break;
-  case "Bookmarks":
-    SidebarUI.toggle("viewBookmarksSidebar");
-    break;
-  case "Home":
-    BrowserHome();
-    break;
-  case "New":
-    BrowserOpenTab();
-    break;
-  case "Close":
-    BrowserCloseTabOrWindow();
-    break;
-  case "Find":
-    gLazyFindCommand("onFindCommand");
-    break;
-  case "Help":
-    openHelpLink("firefox-help");
-    break;
-  case "Open":
-    BrowserOpenFileWindow();
-    break;
-  case "Print":
-    PrintUtils.printWindow(gBrowser.selectedBrowser.outerWindowID,
-                           gBrowser.selectedBrowser);
-    break;
-  case "Save":
-    saveBrowser(gBrowser.selectedBrowser);
-    break;
-  case "SendMail":
-    MailIntegration.sendLinkForBrowser(gBrowser.selectedBrowser);
-    break;
-  default:
-    return;
-  }
-  evt.stopPropagation();
-  evt.preventDefault();
-}
-
-function maybeRecordAbandonmentTelemetry(tab, type) {
-  if (!tab.hasAttribute("busy")) {
-    return;
-  }
-
-  let histogram = Services.telemetry
-                          .getHistogramById("BUSY_TAB_ABANDONED");
-  histogram.add(type);
-}
-
-function gotoHistoryIndex(aEvent) {
-  let index = aEvent.target.getAttribute("index");
-  if (!index)
-    return false;
-
-  let where = whereToOpenLink(aEvent);
-
-  if (where == "current") {
-    // Normal click. Go there in the current tab and update session history.
-
-    try {
-      maybeRecordAbandonmentTelemetry(gBrowser.selectedTab,
-                                      "historyNavigation");
-      gBrowser.gotoIndex(index);
-    } catch (ex) {
-      return false;
-    }
-    return true;
-  }
-  // Modified click. Go there in a new tab/window.
-
-  let historyindex = aEvent.target.getAttribute("historyindex");
-  duplicateTabIn(gBrowser.selectedTab, where, Number(historyindex));
-  return true;
-}
-
-function BrowserForward(aEvent) {
-  let where = whereToOpenLink(aEvent, false, true);
-
-  if (where == "current") {
-    try {
-      maybeRecordAbandonmentTelemetry(gBrowser.selectedTab, "forward");
-      gBrowser.goForward();
-    } catch (ex) {
-    }
-  } else {
-    duplicateTabIn(gBrowser.selectedTab, where, 1);
-  }
-}
-
-function BrowserBack(aEvent) {
-  let where = whereToOpenLink(aEvent, false, true);
-
-  if (where == "current") {
-    try {
-      maybeRecordAbandonmentTelemetry(gBrowser.selectedTab, "back");
-      gBrowser.goBack();
-    } catch (ex) {
-    }
-  } else {
-    duplicateTabIn(gBrowser.selectedTab, where, -1);
-  }
-}
-
-function BrowserHandleBackspace() {
-  switch (Services.prefs.getIntPref("browser.backspace_action")) {
-  case 0:
-    BrowserBack();
-    break;
-  case 1:
-    goDoCommand("cmd_scrollPageUp");
-    break;
-  }
-}
-
-function BrowserHandleShiftBackspace() {
-  switch (Services.prefs.getIntPref("browser.backspace_action")) {
-  case 0:
-    BrowserForward();
-    break;
-  case 1:
-    goDoCommand("cmd_scrollPageDown");
-    break;
-  }
-}
-
-function BrowserStop() {
-  maybeRecordAbandonmentTelemetry(gBrowser.selectedTab, "stop");
-  gBrowser.webNavigation.stop(Ci.nsIWebNavigation.STOP_ALL);
-}
-
-function BrowserReloadOrDuplicate(aEvent) {
-  let metaKeyPressed = AppConstants.platform == "macosx"
-                       ? aEvent.metaKey
-                       : aEvent.ctrlKey;
-  var backgroundTabModifier = aEvent.button == 1 || metaKeyPressed;
-
-  if (aEvent.shiftKey && !backgroundTabModifier) {
-    BrowserReloadSkipCache();
-    return;
-  }
-
-  let where = whereToOpenLink(aEvent, false, true);
-  if (where == "current")
-    BrowserReload();
-  else
-    duplicateTabIn(gBrowser.selectedTab, where);
-}
-
-function BrowserReload() {
-  if (gBrowser.currentURI.schemeIs("view-source")) {
-    // Bug 1167797: For view source, we always skip the cache
-    return BrowserReloadSkipCache();
-  }
-  const reloadFlags = Ci.nsIWebNavigation.LOAD_FLAGS_NONE;
-  BrowserReloadWithFlags(reloadFlags);
-}
-
-function BrowserReloadSkipCache() {
-  // Bypass proxy and cache.
-  const reloadFlags = Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_PROXY |
-                      Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_CACHE;
-  BrowserReloadWithFlags(reloadFlags);
-}
-
-var BrowserHome = BrowserGoHome;
-function BrowserGoHome(aEvent) {
-  if (aEvent && "button" in aEvent &&
-      aEvent.button == 2) // right-click: do nothing
-    return;
-
-  var homePage = gHomeButton.getHomePage();
-  var where = whereToOpenLink(aEvent, false, true);
-  var urls;
-
-  // Home page should open in a new tab when current tab is an app tab
-  if (where == "current" &&
-      gBrowser &&
-      gBrowser.selectedTab.pinned)
-    where = "tab";
-
-  // openUILinkIn in utilityOverlay.js doesn't handle loading multiple pages
-  switch (where) {
-  case "current":
-    loadOneOrMoreURIs(homePage, Services.scriptSecurityManager.getSystemPrincipal());
-    gBrowser.selectedBrowser.focus();
-    break;
-  case "tabshifted":
-  case "tab":
-    urls = homePage.split("|");
-    var loadInBackground = getBoolPref("browser.tabs.loadBookmarksInBackground", false);
-    gBrowser.loadTabs(urls, {
-      inBackground: loadInBackground,
-      triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
-    });
-    break;
-  case "window":
-    OpenBrowserWindow();
-    break;
-  }
-}
-
-function loadOneOrMoreURIs(aURIString, aTriggeringPrincipal) {
-  // we're not a browser window, pass the URI string to a new browser window
-  if (window.location.href != getBrowserURL()) {
-    window.openDialog(getBrowserURL(), "_blank", "all,dialog=no", aURIString);
-    return;
-  }
-
-  // This function throws for certain malformed URIs, so use exception handling
-  // so that we don't disrupt startup
-  try {
-    gBrowser.loadTabs(aURIString.split("|"), {
-      inBackground: false,
-      replace: true,
-      triggeringPrincipal: aTriggeringPrincipal,
-    });
-  } catch (e) {
-  }
-}
-
-/**
- * Focuses the location bar input field and selects its contents.
- *
- * @param [optional] userInitiatedFocus
- *        Whether this focus is caused by an user interaction whose intention
- *        was to use the location bar. For example, using a shortcut to go to
- *        the location bar, or a contextual menu to search from it.
- *        The default is false and should be used in all those cases where the
- *        code focuses the location bar but that's not the primary user
- *        intention, like when opening a new tab.
- */
-function focusAndSelectUrlBar(userInitiatedFocus = false) {
-  // In customize mode, the url bar is disabled. If a new tab is opened or the
-  // user switches to a different tab, this function gets called before we've
-  // finished leaving customize mode, and the url bar will still be disabled.
-  // We can't focus it when it's disabled, so we need to re-run ourselves when
-  // we've finished leaving customize mode.
-  if (CustomizationHandler.isExitingCustomizeMode) {
-    gNavToolbox.addEventListener("aftercustomization", function() {
-      focusAndSelectUrlBar(userInitiatedFocus);
-    }, {once: true});
-
-    return true;
-  }
-
-  if (gURLBar) {
-    if (window.fullScreen)
-      FullScreen.showNavToolbox();
-
-    gURLBar.userInitiatedFocus = userInitiatedFocus;
-    gURLBar.select();
-    gURLBar.userInitiatedFocus = false;
-    if (document.activeElement == gURLBar.inputField)
-      return true;
-  }
-  return false;
-}
-
-function openLocation() {
-  if (focusAndSelectUrlBar(true))
-    return;
-
-  if (window.location.href != getBrowserURL()) {
-    var win = getTopWin();
-    if (win) {
-      // If there's an open browser window, it should handle this command
-      win.focus();
-      win.openLocation();
-    } else {
-      // If there are no open browser windows, open a new one
-      window.openDialog("chrome://browser/content/", "_blank",
-                        "chrome,all,dialog=no", BROWSER_NEW_TAB_URL);
-    }
-  }
-}
-
-function BrowserOpenTab(event) {
-  // A notification intended to be useful for modular peformance tracking
-  // starting as close as is reasonably possible to the time when the user
-  // expressed the intent to open a new tab.  Since there are a lot of
-  // entry points, this won't catch every single tab created, but most
-  // initiated by the user should go through here.
-  Services.obs.notifyObservers(null, "browser-open-newtab-start");
-
-  let where = "tab";
-  let relatedToCurrent = false;
-
-  if (event) {
-    where = whereToOpenLink(event, false, true);
-
-    switch (where) {
-      case "tab":
-      case "tabshifted":
-        // When accel-click or middle-click are used, open the new tab as
-        // related to the current tab.
-        relatedToCurrent = true;
-        break;
-      case "current":
-        where = "tab";
-        break;
-    }
-  }
-
-  openUILinkIn(BROWSER_NEW_TAB_URL, where, { relatedToCurrent });
-}
-
-var gLastOpenDirectory = {
-  _lastDir: null,
-  get path() {
-    if (!this._lastDir || !this._lastDir.exists()) {
-      try {
-        this._lastDir = Services.prefs.getComplexValue("browser.open.lastDir",
-                                                       Ci.nsIFile);
-        if (!this._lastDir.exists())
-          this._lastDir = null;
-      } catch (e) {}
-    }
-    return this._lastDir;
-  },
-  set path(val) {
-    try {
-      if (!val || !val.isDirectory())
-        return;
-    } catch (e) {
-      return;
-    }
-    this._lastDir = val.clone();
-
-    // Don't save the last open directory pref inside the Private Browsing mode
-    if (!PrivateBrowsingUtils.isWindowPrivate(window))
-      Services.prefs.setComplexValue("browser.open.lastDir", Ci.nsIFile,
-                                     this._lastDir);
-  },
-  reset() {
-    this._lastDir = null;
-  }
-};
-
-function BrowserOpenFileWindow() {
-  // Get filepicker component.
-  try {
-    const nsIFilePicker = Ci.nsIFilePicker;
-    let fp = Cc["@mozilla.org/filepicker;1"].createInstance(nsIFilePicker);
-    let fpCallback = function fpCallback_done(aResult) {
-      if (aResult == nsIFilePicker.returnOK) {
-        try {
-          if (fp.file) {
-            gLastOpenDirectory.path =
-              fp.file.parent.QueryInterface(Ci.nsIFile);
-          }
-        } catch (ex) {
-        }
-        openUILinkIn(fp.fileURL.spec, "current");
-      }
-    };
-
-    fp.init(window, gNavigatorBundle.getString("openFile"),
-            nsIFilePicker.modeOpen);
-    fp.appendFilters(nsIFilePicker.filterAll | nsIFilePicker.filterText |
-                     nsIFilePicker.filterImages | nsIFilePicker.filterXML |
-                     nsIFilePicker.filterHTML);
-    fp.displayDirectory = gLastOpenDirectory.path;
-    fp.open(fpCallback);
-  } catch (ex) {
-  }
-}
-
-function BrowserCloseTabOrWindow(event) {
-  // If we're not a browser window, just close the window.
-  if (window.location.href != getBrowserURL()) {
-    closeWindow(true);
-    return;
-  }
-
-  // Keyboard shortcuts that would close a tab that is pinned select the first
-  // unpinned tab instead.
-  if (event &&
-      (event.ctrlKey || event.metaKey || event.altKey) &&
-      gBrowser.selectedTab.pinned) {
-    if (gBrowser.visibleTabs.length > gBrowser._numPinnedTabs) {
-      gBrowser.tabContainer.selectedIndex = gBrowser._numPinnedTabs;
-    }
-    return;
-  }
-
-  // If the current tab is the last one, this will close the window.
-  gBrowser.removeCurrentTab({animate: true});
-}
-
-function BrowserTryToCloseWindow() {
-  if (WindowIsClosing())
-    window.close(); // WindowIsClosing does all the necessary checks
-}
-
-function loadURI(uri, referrer, postData, allowThirdPartyFixup, referrerPolicy,
-                 userContextId, originPrincipal, forceAboutBlankViewerInCurrent,
-                 triggeringPrincipal) {
-  try {
-    openLinkIn(uri, "current",
-               { referrerURI: referrer,
-                 referrerPolicy,
-                 postData,
-                 allowThirdPartyFixup,
-                 userContextId,
-                 originPrincipal,
-                 triggeringPrincipal,
-                 forceAboutBlankViewerInCurrent,
-               });
-  } catch (e) {}
-}
-
-/**
- * Given a string, will generate a more appropriate urlbar value if a Places
- * keyword or a search alias is found at the beginning of it.
- *
- * @param url
- *        A string that may begin with a keyword or an alias.
- *
- * @return {Promise}
- * @resolves { url, postData, mayInheritPrincipal }. If it's not possible
- *           to discern a keyword or an alias, url will be the input string.
- */
-function getShortcutOrURIAndPostData(url, callback = null) {
-  if (callback) {
-    Deprecated.warning("Please use the Promise returned by " +
-                       "getShortcutOrURIAndPostData() instead of passing a " +
-                       "callback",
-                       "https://bugzilla.mozilla.org/show_bug.cgi?id=1100294");
-  }
-  return (async function() {
-    let mayInheritPrincipal = false;
-    let postData = null;
-    // Split on the first whitespace.
-    let [keyword, param = ""] = url.trim().split(/\s(.+)/, 2);
-
-    if (!keyword) {
-      return { url, postData, mayInheritPrincipal };
-    }
-
-    let engine = Services.search.getEngineByAlias(keyword);
-    if (engine) {
-      let submission = engine.getSubmission(param, null, "keyword");
-      return { url: submission.uri.spec,
-               postData: submission.postData,
-               mayInheritPrincipal };
-    }
-
-    // A corrupt Places database could make this throw, breaking navigation
-    // from the location bar.
-    let entry = null;
-    try {
-      entry = await PlacesUtils.keywords.fetch(keyword);
-    } catch (ex) {
-      Cu.reportError(`Unable to fetch Places keyword "${keyword}": ${ex}`);
-    }
-    if (!entry || !entry.url) {
-      // This is not a Places keyword.
-      return { url, postData, mayInheritPrincipal };
-    }
-
-    try {
-      [url, postData] =
-        await BrowserUtils.parseUrlAndPostData(entry.url.href,
-                                               entry.postData,
-                                               param);
-      if (postData) {
-        postData = getPostDataStream(postData);
-      }
-
-      // Since this URL came from a bookmark, it's safe to let it inherit the
-      // current document's principal.
-      mayInheritPrincipal = true;
-    } catch (ex) {
-      // It was not possible to bind the param, just use the original url value.
-    }
-
-    return { url, postData, mayInheritPrincipal };
-  })().then(data => {
-    if (callback) {
-      callback(data);
-    }
-    return data;
-  });
-}
-
-function getPostDataStream(aPostDataString,
-                           aType = "application/x-www-form-urlencoded") {
-  let dataStream = Cc["@mozilla.org/io/string-input-stream;1"]
-                     .createInstance(Ci.nsIStringInputStream);
-  dataStream.data = aPostDataString;
-
-  let mimeStream = Cc["@mozilla.org/network/mime-input-stream;1"]
-                     .createInstance(Ci.nsIMIMEInputStream);
-  mimeStream.addHeader("Content-Type", aType);
-  mimeStream.setData(dataStream);
-  return mimeStream.QueryInterface(Ci.nsIInputStream);
-}
-
-function getLoadContext() {
-  return window.QueryInterface(Ci.nsIInterfaceRequestor)
-               .getInterface(Ci.nsIWebNavigation)
-               .QueryInterface(Ci.nsILoadContext);
-}
-
-function readFromClipboard() {
-  var url;
-
-  try {
-    // Create transferable that will transfer the text.
-    var trans = Cc["@mozilla.org/widget/transferable;1"]
-                  .createInstance(Ci.nsITransferable);
-    trans.init(getLoadContext());
-
-    trans.addDataFlavor("text/unicode");
-
-    // If available, use selection clipboard, otherwise global one
-    if (Services.clipboard.supportsSelectionClipboard())
-      Services.clipboard.getData(trans, Services.clipboard.kSelectionClipboard);
-    else
-      Services.clipboard.getData(trans, Services.clipboard.kGlobalClipboard);
-
-    var data = {};
-    var dataLen = {};
-    trans.getTransferData("text/unicode", data, dataLen);
-
-    if (data) {
-      data = data.value.QueryInterface(Ci.nsISupportsString);
-      url = data.data.substring(0, dataLen.value / 2);
-    }
-  } catch (ex) {
-  }
-
-  return url;
-}
-
-/**
- * Open the View Source dialog.
- *
- * @param aArgsOrDocument
- *        Either an object or a Document. Passing a Document is deprecated,
- *        and is not supported with e10s. This function will throw if
- *        aArgsOrDocument is a CPOW.
- *
- *        If aArgsOrDocument is an object, that object can take the
- *        following properties:
- *
- *        URL (required):
- *          A string URL for the page we'd like to view the source of.
- *        browser (optional):
- *          The browser containing the document that we would like to view the
- *          source of. This is required if outerWindowID is passed.
- *        outerWindowID (optional):
- *          The outerWindowID of the content window containing the document that
- *          we want to view the source of. You only need to provide this if you
- *          want to attempt to retrieve the document source from the network
- *          cache.
- *        lineNumber (optional):
- *          The line number to focus on once the source is loaded.
- */
-async function BrowserViewSourceOfDocument(aArgsOrDocument) {
-  let args;
-
-  if (aArgsOrDocument instanceof Document) {
-    let doc = aArgsOrDocument;
-    // Deprecated API - callers should pass args object instead.
-    if (Cu.isCrossProcessWrapper(doc)) {
-      throw new Error("BrowserViewSourceOfDocument cannot accept a CPOW " +
-                      "as a document.");
-    }
-
-    let requestor = doc.defaultView
-                       .QueryInterface(Ci.nsIInterfaceRequestor);
-    let browser = requestor.getInterface(Ci.nsIWebNavigation)
-                           .QueryInterface(Ci.nsIDocShell)
-                           .chromeEventHandler;
-    let outerWindowID = requestor.getInterface(Ci.nsIDOMWindowUtils)
-                                 .outerWindowID;
-    let URL = browser.currentURI.spec;
-    args = { browser, outerWindowID, URL };
-  } else {
-    args = aArgsOrDocument;
-  }
-
-  // Check if external view source is enabled.  If so, try it.  If it fails,
-  // fallback to internal view source.
-  if (Services.prefs.getBoolPref("view_source.editor.external")) {
-    try {
-      await top.gViewSourceUtils.openInExternalEditor(args);
-      return;
-    } catch (data) {}
-  }
-
-  let tabBrowser = gBrowser;
-  let preferredRemoteType;
-  if (args.browser) {
-    preferredRemoteType = args.browser.remoteType;
-  } else {
-    if (!tabBrowser) {
-      throw new Error("BrowserViewSourceOfDocument should be passed the " +
-                      "subject browser if called from a window without " +
-                      "gBrowser defined.");
-    }
-    // Some internal URLs (such as specific chrome: and about: URLs that are
-    // not yet remote ready) cannot be loaded in a remote browser.  View
-    // source in tab expects the new view source browser's remoteness to match
-    // that of the original URL, so disable remoteness if necessary for this
-    // URL.
-    preferredRemoteType =
-      E10SUtils.getRemoteTypeForURI(args.URL, gMultiProcessBrowser);
-  }
-
-  // In the case of popups, we need to find a non-popup browser window.
-  if (!tabBrowser || !window.toolbar.visible) {
-    // This returns only non-popup browser windows by default.
-    let browserWindow = RecentWindow.getMostRecentBrowserWindow();
-    tabBrowser = browserWindow.gBrowser;
-  }
-
-  // `viewSourceInBrowser` will load the source content from the page
-  // descriptor for the tab (when possible) or fallback to the network if
-  // that fails.  Either way, the view source module will manage the tab's
-  // location, so use "about:blank" here to avoid unnecessary redundant
-  // requests.
-  let tab = tabBrowser.loadOneTab("about:blank", {
-    relatedToCurrent: true,
-    inBackground: false,
-    preferredRemoteType,
-    sameProcessAsFrameLoader: args.browser ? args.browser.frameLoader : null,
-    triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
-  });
-  args.viewSourceBrowser = tabBrowser.getBrowserForTab(tab);
-  top.gViewSourceUtils.viewSourceInBrowser(args);
-}
-
-/**
- * Opens the View Source dialog for the source loaded in the root
- * top-level document of the browser. This is really just a
- * convenience wrapper around BrowserViewSourceOfDocument.
- *
- * @param browser
- *        The browser that we want to load the source of.
- */
-function BrowserViewSource(browser) {
-  BrowserViewSourceOfDocument({
-    browser,
-    outerWindowID: browser.outerWindowID,
-    URL: browser.currentURI.spec,
-  });
-}
-
-// documentURL - URL of the document to view, or null for this window's document
-// initialTab - name of the initial tab to display, or null for the first tab
-// imageElement - image to load in the Media Tab of the Page Info window; can be null/omitted
-// frameOuterWindowID - the id of the frame that the context menu opened in; can be null/omitted
-// browser - the browser containing the document we're interested in inspecting; can be null/omitted
-function BrowserPageInfo(documentURL, initialTab, imageElement, frameOuterWindowID, browser) {
-  if (documentURL instanceof HTMLDocument) {
-    Deprecated.warning("Please pass the location URL instead of the document " +
-                       "to BrowserPageInfo() as the first argument.",
-                       "https://bugzilla.mozilla.org/show_bug.cgi?id=1238180");
-    documentURL = documentURL.location;
-  }
-
-  let args = { initialTab, imageElement, frameOuterWindowID, browser };
-  var windows = Services.wm.getEnumerator("Browser:page-info");
-
-  documentURL = documentURL || window.gBrowser.selectedBrowser.currentURI.spec;
-
-  // Check for windows matching the url
-  while (windows.hasMoreElements()) {
-    var currentWindow = windows.getNext();
-    if (currentWindow.closed) {
-      continue;
-    }
-    if (currentWindow.document.documentElement.getAttribute("relatedUrl") == documentURL) {
-      currentWindow.focus();
-      currentWindow.resetPageInfo(args);
-      return currentWindow;
-    }
-  }
-
-  // We didn't find a matching window, so open a new one.
-  return openDialog("chrome://browser/content/pageinfo/pageInfo.xul", "",
-                    "chrome,toolbar,dialog=no,resizable", args);
-}
-
-/**
- * Sets the URI to display in the location bar.
- *
- * @param aURI [optional]
- *        nsIURI to set. If this is unspecified, the current URI will be used.
- */
-function URLBarSetURI(aURI) {
-  var value = gBrowser.userTypedValue;
-  var valid = false;
-
-  if (value == null) {
-    let uri = aURI || gBrowser.currentURI;
-    // Strip off "wyciwyg://" and passwords for the location bar
-    try {
-      uri = Services.uriFixup.createExposableURI(uri);
-    } catch (e) {}
-
-    // Replace initial page URIs with an empty string
-    // only if there's no opener (bug 370555).
-    if (isInitialPage(uri.spec) &&
-        checkEmptyPageOrigin(gBrowser.selectedBrowser, uri)) {
-      value = "";
-    } else {
-      // We should deal with losslessDecodeURI throwing for exotic URIs
-      try {
-        value = losslessDecodeURI(uri);
-      } catch (ex) {
-        value = "about:blank";
-      }
-    }
-
-    valid = !isBlankPageURL(uri.spec) || uri.schemeIs("moz-extension");
-  } else if (isInitialPage(value) &&
-             checkEmptyPageOrigin(gBrowser.selectedBrowser)) {
-    value = "";
-    valid = true;
-  }
-
-  let isDifferentValidValue = valid && value != gURLBar.value;
-  gURLBar.value = value;
-  gURLBar.valueIsTyped = !valid;
-  gURLBar.removeAttribute("usertyping");
-  if (isDifferentValidValue) {
-    gURLBar.selectionStart = gURLBar.selectionEnd = 0;
-  }
-
-  SetPageProxyState(valid ? "valid" : "invalid");
-}
-
-function losslessDecodeURI(aURI) {
-  let scheme = aURI.scheme;
-  if (scheme == "moz-action")
-    throw new Error("losslessDecodeURI should never get a moz-action URI");
-
-  var value = aURI.displaySpec;
-
-  let decodeASCIIOnly = !["https", "http", "file", "ftp"].includes(scheme);
-  // Try to decode as UTF-8 if there's no encoding sequence that we would break.
-  if (!/%25(?:3B|2F|3F|3A|40|26|3D|2B|24|2C|23)/i.test(value)) {
-    if (decodeASCIIOnly) {
-      // This only decodes ascii characters (hex) 20-7e, except 25 (%).
-      // This avoids both cases stipulated below (%-related issues, and \r, \n
-      // and \t, which would be %0d, %0a and %09, respectively) as well as any
-      // non-US-ascii characters.
-      value = value.replace(/%(2[0-4]|2[6-9a-f]|[3-6][0-9a-f]|7[0-9a-e])/g, decodeURI);
-    } else {
-      try {
-        value = decodeURI(value)
-                  // 1. decodeURI decodes %25 to %, which creates unintended
-                  //    encoding sequences. Re-encode it, unless it's part of
-                  //    a sequence that survived decodeURI, i.e. one for:
-                  //    ';', '/', '?', ':', '@', '&', '=', '+', '$', ',', '#'
-                  //    (RFC 3987 section 3.2)
-                  // 2. Re-encode select whitespace so that it doesn't get eaten
-                  //    away by the location bar (bug 410726). Re-encode all
-                  //    adjacent whitespace, to prevent spoofing attempts where
-                  //    invisible characters would push part of the URL to
-                  //    overflow the location bar (bug 1395508).
-                  .replace(/%(?!3B|2F|3F|3A|40|26|3D|2B|24|2C|23)|[\r\n\t]|\s(?=\s)|\s$/ig,
-                           encodeURIComponent);
-      } catch (e) {}
-    }
-  }
-
-  // Encode invisible characters (C0/C1 control characters, U+007F [DEL],
-  // U+00A0 [no-break space], line and paragraph separator,
-  // object replacement character) (bug 452979, bug 909264)
-  value = value.replace(/[\u0000-\u001f\u007f-\u00a0\u2028\u2029\ufffc]/g,
-                        encodeURIComponent);
-
-  // Encode default ignorable characters (bug 546013)
-  // except ZWNJ (U+200C) and ZWJ (U+200D) (bug 582186).
-  // This includes all bidirectional formatting characters.
-  // (RFC 3987 sections 3.2 and 4.1 paragraph 6)
-  value = value.replace(/[\u00ad\u034f\u061c\u115f-\u1160\u17b4-\u17b5\u180b-\u180d\u200b\u200e-\u200f\u202a-\u202e\u2060-\u206f\u3164\ufe00-\ufe0f\ufeff\uffa0\ufff0-\ufff8]|\ud834[\udd73-\udd7a]|[\udb40-\udb43][\udc00-\udfff]/g,
-                        encodeURIComponent);
-  return value;
-}
-
-function UpdateUrlbarSearchSplitterState() {
-  var splitter = document.getElementById("urlbar-search-splitter");
-  var urlbar = document.getElementById("urlbar-container");
-  var searchbar = document.getElementById("search-container");
-
-  if (document.documentElement.getAttribute("customizing") == "true") {
-    if (splitter) {
-      splitter.remove();
-    }
-    return;
-  }
-
-  // If the splitter is already in the right place, we don't need to do anything:
-  if (splitter &&
-      ((splitter.nextSibling == searchbar && splitter.previousSibling == urlbar) ||
-       (splitter.nextSibling == urlbar && splitter.previousSibling == searchbar))) {
-    return;
-  }
-
-  var ibefore = null;
-  if (urlbar && searchbar) {
-    if (urlbar.nextSibling == searchbar)
-      ibefore = searchbar;
-    else if (searchbar.nextSibling == urlbar)
-      ibefore = urlbar;
-  }
-
-  if (ibefore) {
-    if (!splitter) {
-      splitter = document.createElement("splitter");
-      splitter.id = "urlbar-search-splitter";
-      splitter.setAttribute("resizebefore", "flex");
-      splitter.setAttribute("resizeafter", "flex");
-      splitter.setAttribute("skipintoolbarset", "true");
-      splitter.setAttribute("overflows", "false");
-      splitter.className = "chromeclass-toolbar-additional";
-    }
-    urlbar.parentNode.insertBefore(splitter, ibefore);
-  } else if (splitter)
-    splitter.remove();
-}
-
-function UpdatePageProxyState() {
-  if (gURLBar && gURLBar.value != gLastValidURLStr)
-    SetPageProxyState("invalid");
-}
-
-/**
- * Updates the user interface to indicate whether the URI in the location bar is
- * different than the loaded page, because it's being edited or because a search
- * result is currently selected and is displayed in the location bar.
- *
- * @param aState
- *        The string "valid" indicates that the security indicators and other
- *        related user interface elments should be shown because the URI in the
- *        location bar matches the loaded page. The string "invalid" indicates
- *        that the URI in the location bar is different than the loaded page.
- */
-function SetPageProxyState(aState) {
-  if (!gURLBar)
-    return;
-
-  let oldPageProxyState = gURLBar.getAttribute("pageproxystate");
-  // The "browser_urlbar_stop_pending.js" test uses a MutationObserver to do
-  // some verifications at this point, and it breaks if we don't write the
-  // attribute, even if it hasn't changed (bug 1338115).
-  gURLBar.setAttribute("pageproxystate", aState);
-
-  // the page proxy state is set to valid via OnLocationChange, which
-  // gets called when we switch tabs.
-  if (aState == "valid") {
-    gLastValidURLStr = gURLBar.value;
-    gURLBar.addEventListener("input", UpdatePageProxyState);
-  } else if (aState == "invalid") {
-    gURLBar.removeEventListener("input", UpdatePageProxyState);
-  }
-
-  // After we've ensured that we've applied the listeners and updated the value
-  // of gLastValidURLStr, return early if the actual state hasn't changed.
-  if (oldPageProxyState == aState) {
-    return;
-  }
-
-  UpdatePopupNotificationsVisibility();
-}
-
-function UpdatePopupNotificationsVisibility() {
-  // Only need to do something if the PopupNotifications object for this window
-  // has already been initialized (i.e. its getter no longer exists).
-  if (Object.getOwnPropertyDescriptor(window, "PopupNotifications").get) {
-    return;
-  }
-
-  // Notify PopupNotifications that the visible anchors may have changed. This
-  // also checks the suppression state according to the "shouldSuppress"
-  // function defined earlier in this file.
-  PopupNotifications.anchorVisibilityChange();
-}
-
-function PageProxyClickHandler(aEvent) {
-  if (aEvent.button == 1 && Services.prefs.getBoolPref("middlemouse.paste"))
-    middleMousePaste(aEvent);
-}
-
-// Values for telemtery bins: see TLS_ERROR_REPORT_UI in Histograms.json
-const TLS_ERROR_REPORT_TELEMETRY_AUTO_CHECKED   = 2;
-const TLS_ERROR_REPORT_TELEMETRY_AUTO_UNCHECKED = 3;
-
-const PREF_SSL_IMPACT_ROOTS = ["security.tls.version.", "security.ssl3."];
-
-/**
- * Handle command events bubbling up from error page content
- * or from about:newtab or from remote error pages that invoke
- * us via async messaging.
- */
-var BrowserOnClick = {
-  init() {
-    let mm = window.messageManager;
-    mm.addMessageListener("Browser:CertExceptionError", this);
-    mm.addMessageListener("Browser:OpenCaptivePortalPage", this);
-    mm.addMessageListener("Browser:SiteBlockedError", this);
-    mm.addMessageListener("Browser:EnableOnlineMode", this);
-    mm.addMessageListener("Browser:SetSSLErrorReportAuto", this);
-    mm.addMessageListener("Browser:ResetSSLPreferences", this);
-    mm.addMessageListener("Browser:SSLErrorReportTelemetry", this);
-    mm.addMessageListener("Browser:SSLErrorGoBack", this);
-
-    Services.obs.addObserver(this, "captive-portal-login-abort");
-    Services.obs.addObserver(this, "captive-portal-login-success");
-  },
-
-  uninit() {
-    let mm = window.messageManager;
-    mm.removeMessageListener("Browser:CertExceptionError", this);
-    mm.removeMessageListener("Browser:SiteBlockedError", this);
-    mm.removeMessageListener("Browser:EnableOnlineMode", this);
-    mm.removeMessageListener("Browser:SetSSLErrorReportAuto", this);
-    mm.removeMessageListener("Browser:ResetSSLPreferences", this);
-    mm.removeMessageListener("Browser:SSLErrorReportTelemetry", this);
-    mm.removeMessageListener("Browser:SSLErrorGoBack", this);
-
-    Services.obs.removeObserver(this, "captive-portal-login-abort");
-    Services.obs.removeObserver(this, "captive-portal-login-success");
-  },
-
-  observe(aSubject, aTopic, aData) {
-    switch (aTopic) {
-      case "captive-portal-login-abort":
-      case "captive-portal-login-success":
-        // Broadcast when a captive portal is freed so that error pages
-        // can refresh themselves.
-        window.messageManager.broadcastAsyncMessage("Browser:CaptivePortalFreed");
-      break;
-    }
-  },
-
-  receiveMessage(msg) {
-    switch (msg.name) {
-      case "Browser:CertExceptionError":
-        this.onCertError(msg.target, msg.data.elementId,
-                         msg.data.isTopFrame, msg.data.location,
-                         msg.data.securityInfoAsString,
-                         msg.data.frameId);
-      break;
-      case "Browser:OpenCaptivePortalPage":
-        CaptivePortalWatcher.ensureCaptivePortalTab();
-      break;
-      case "Browser:SiteBlockedError":
-        this.onAboutBlocked(msg.data.elementId, msg.data.reason,
-                            msg.data.isTopFrame, msg.data.location,
-                            msg.data.blockedInfo);
-      break;
-      case "Browser:EnableOnlineMode":
-        if (Services.io.offline) {
-          // Reset network state and refresh the page.
-          Services.io.offline = false;
-          msg.target.reload();
-        }
-      break;
-      case "Browser:ResetSSLPreferences":
-        let prefSSLImpact = PREF_SSL_IMPACT_ROOTS.reduce((prefs, root) => {
-                return prefs.concat(Services.prefs.getChildList(root));
-        }, []);
-        for (let prefName of prefSSLImpact) {
-          Services.prefs.clearUserPref(prefName);
-        }
-        msg.target.reload();
-      break;
-      case "Browser:SetSSLErrorReportAuto":
-        Services.prefs.setBoolPref("security.ssl.errorReporting.automatic", msg.json.automatic);
-        let bin = TLS_ERROR_REPORT_TELEMETRY_AUTO_UNCHECKED;
-        if (msg.json.automatic) {
-          bin = TLS_ERROR_REPORT_TELEMETRY_AUTO_CHECKED;
-        }
-        Services.telemetry.getHistogramById("TLS_ERROR_REPORT_UI").add(bin);
-      break;
-      case "Browser:SSLErrorReportTelemetry":
-        let reportStatus = msg.data.reportStatus;
-        Services.telemetry.getHistogramById("TLS_ERROR_REPORT_UI")
-          .add(reportStatus);
-      break;
-      case "Browser:SSLErrorGoBack":
-        goBackFromErrorPage();
-      break;
-    }
-  },
-
-  onCertError(browser, elementId, isTopFrame, location, securityInfoAsString, frameId) {
-    let secHistogram = Services.telemetry.getHistogramById("SECURITY_UI");
-    let securityInfo;
-    let sslStatus;
-
-    switch (elementId) {
-      case "exceptionDialogButton":
-        if (isTopFrame) {
-          secHistogram.add(Ci.nsISecurityUITelemetry.WARNING_BAD_CERT_TOP_CLICK_ADD_EXCEPTION);
-        }
-
-        securityInfo = getSecurityInfo(securityInfoAsString);
-        sslStatus = securityInfo.QueryInterface(Ci.nsISSLStatusProvider)
-                                .SSLStatus;
-        let params = { exceptionAdded: false,
-                       sslStatus };
-
-        try {
-          switch (Services.prefs.getIntPref("browser.ssl_override_behavior")) {
-            case 2 : // Pre-fetch & pre-populate
-              params.prefetchCert = true;
-            case 1 : // Pre-populate
-              params.location = location;
-          }
-        } catch (e) {
-          Cu.reportError("Couldn't get ssl_override pref: " + e);
-        }
-
-        window.openDialog("chrome://pippki/content/exceptionDialog.xul",
-                          "", "chrome,centerscreen,modal", params);
-
-        // If the user added the exception cert, attempt to reload the page
-        if (params.exceptionAdded) {
-          browser.reload();
-        }
-        break;
-
-      case "returnButton":
-        if (isTopFrame) {
-          secHistogram.add(Ci.nsISecurityUITelemetry.WARNING_BAD_CERT_TOP_GET_ME_OUT_OF_HERE);
-        }
-        goBackFromErrorPage();
-        break;
-
-      case "advancedButton":
-        if (isTopFrame) {
-          secHistogram.add(Ci.nsISecurityUITelemetry.WARNING_BAD_CERT_TOP_UNDERSTAND_RISKS);
-        }
-
-        securityInfo = getSecurityInfo(securityInfoAsString);
-        sslStatus = securityInfo.QueryInterface(Ci.nsISSLStatusProvider)
-                                .SSLStatus;
-        let errorInfo = getDetailedCertErrorInfo(location,
-                                                 securityInfo);
-        let validityInfo = {
-          notAfter: sslStatus.serverCert.validity.notAfter,
-          notBefore: sslStatus.serverCert.validity.notBefore,
-          notAfterLocalTime: sslStatus.serverCert.validity.notAfterLocalTime,
-          notBeforeLocalTime: sslStatus.serverCert.validity.notBeforeLocalTime,
-        };
-        browser.messageManager.sendAsyncMessage("CertErrorDetails", {
-            code: securityInfo.errorCode,
-            info: errorInfo,
-            codeString: securityInfo.errorCodeString,
-            certIsUntrusted: sslStatus.isUntrusted,
-            certSubjectAltNames: sslStatus.serverCert.subjectAltNames,
-            validity: validityInfo,
-            url: location,
-            isDomainMismatch: sslStatus.isDomainMismatch,
-            isNotValidAtThisTime: sslStatus.isNotValidAtThisTime,
-            frameId
-        });
-        break;
-
-      case "copyToClipboard":
-        const gClipboardHelper = Cc["@mozilla.org/widget/clipboardhelper;1"]
-                                    .getService(Ci.nsIClipboardHelper);
-        securityInfo = getSecurityInfo(securityInfoAsString);
-        let detailedInfo = getDetailedCertErrorInfo(location,
-                                                    securityInfo);
-        gClipboardHelper.copyString(detailedInfo);
-        break;
-
-    }
-  },
-
-  onAboutBlocked(elementId, reason, isTopFrame, location, blockedInfo) {
-    // Depending on what page we are displaying here (malware/phishing/unwanted)
-    // use the right strings and links for each.
-    let bucketName = "";
-    let sendTelemetry = false;
-    if (reason === "malware") {
-      sendTelemetry = true;
-      bucketName = "WARNING_MALWARE_PAGE_";
-    } else if (reason === "phishing") {
-      sendTelemetry = true;
-      bucketName = "WARNING_PHISHING_PAGE_";
-    } else if (reason === "unwanted") {
-      sendTelemetry = true;
-      bucketName = "WARNING_UNWANTED_PAGE_";
-    } else if (reason === "harmful") {
-      sendTelemetry = true;
-      bucketName = "WARNING_HARMFUL_PAGE_";
-    }
-    let secHistogram = Services.telemetry.getHistogramById("URLCLASSIFIER_UI_EVENTS");
-    let nsISecTel = Ci.IUrlClassifierUITelemetry;
-    bucketName += isTopFrame ? "TOP_" : "FRAME_";
-
-    switch (elementId) {
-      case "goBackButton":
-        if (sendTelemetry) {
-          secHistogram.add(nsISecTel[bucketName + "GET_ME_OUT_OF_HERE"]);
-        }
-        getMeOutOfHere();
-        break;
-      case "ignore_warning_link":
-        if (Services.prefs.getBoolPref("browser.safebrowsing.allowOverride")) {
-          if (sendTelemetry) {
-            secHistogram.add(nsISecTel[bucketName + "IGNORE_WARNING"]);
-          }
-          this.ignoreWarningLink(reason, blockedInfo);
-        }
-        break;
-    }
-  },
-
-  ignoreWarningLink(reason, blockedInfo) {
-    // Allow users to override and continue through to the site,
-    // but add a notify bar as a reminder, so that they don't lose
-    // track after, e.g., tab switching.
-    gBrowser.loadURI(gBrowser.currentURI.spec, {
-      flags: Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_CLASSIFIER,
-    });
-
-    Services.perms.add(gBrowser.currentURI, "safe-browsing",
-                       Ci.nsIPermissionManager.ALLOW_ACTION,
-                       Ci.nsIPermissionManager.EXPIRE_SESSION);
-
-    let buttons = [{
-      label: gNavigatorBundle.getString("safebrowsing.getMeOutOfHereButton.label"),
-      accessKey: gNavigatorBundle.getString("safebrowsing.getMeOutOfHereButton.accessKey"),
-      callback() { getMeOutOfHere(); }
-    }];
-
-    let title;
-    if (reason === "malware") {
-      let reportUrl = gSafeBrowsing.getReportURL("MalwareMistake", blockedInfo);
-      title = gNavigatorBundle.getString("safebrowsing.reportedAttackSite");
-      // There's no button if we can not get report url, for example if the provider
-      // of blockedInfo is not Google
-      if (reportUrl) {
-        buttons[1] = {
-          label: gNavigatorBundle.getString("safebrowsing.notAnAttackButton.label"),
-          accessKey: gNavigatorBundle.getString("safebrowsing.notAnAttackButton.accessKey"),
-          callback() {
-            openUILinkIn(reportUrl, "tab");
-          }
-        };
-      }
-    } else if (reason === "phishing") {
-      let reportUrl = gSafeBrowsing.getReportURL("PhishMistake", blockedInfo);
-      title = gNavigatorBundle.getString("safebrowsing.deceptiveSite");
-      // There's no button if we can not get report url, for example if the provider
-      // of blockedInfo is not Google
-      if (reportUrl) {
-        buttons[1] = {
-          label: gNavigatorBundle.getString("safebrowsing.notADeceptiveSiteButton.label"),
-          accessKey: gNavigatorBundle.getString("safebrowsing.notADeceptiveSiteButton.accessKey"),
-          callback() {
-            openUILinkIn(reportUrl, "tab");
-          }
-        };
-      }
-    } else if (reason === "unwanted") {
-      title = gNavigatorBundle.getString("safebrowsing.reportedUnwantedSite");
-      // There is no button for reporting errors since Google doesn't currently
-      // provide a URL endpoint for these reports.
-    } else if (reason === "harmful") {
-      title = gNavigatorBundle.getString("safebrowsing.reportedHarmfulSite");
-      // There is no button for reporting errors since Google doesn't currently
-      // provide a URL endpoint for these reports.
-    }
-
-    SafeBrowsingNotificationBox.show(title, buttons);
-  },
-};
-
-/**
- * Re-direct the browser to a known-safe page.  This function is
- * used when, for example, the user browses to a known malware page
- * and is presented with about:blocked.  The "Get me out of here!"
- * button should take the user to the default start page so that even
- * when their own homepage is infected, we can get them somewhere safe.
- */
-function getMeOutOfHere() {
-  gBrowser.loadURI(getDefaultHomePage());
-}
-
-/**
- * Re-direct the browser to the previous page or a known-safe page if no
- * previous page is found in history.  This function is used when the user
- * browses to a secure page with certificate issues and is presented with
- * about:certerror.  The "Go Back" button should take the user to the previous
- * or a default start page so that even when their own homepage is on a server
- * that has certificate errors, we can get them somewhere safe.
- */
-function goBackFromErrorPage() {
-  const ss = Cc["@mozilla.org/browser/sessionstore;1"].
-             getService(Ci.nsISessionStore);
-  let state = JSON.parse(ss.getTabState(gBrowser.selectedTab));
-  if (state.index == 1) {
-    // If the unsafe page is the first or the only one in history, go to the
-    // start page.
-    gBrowser.loadURI(getDefaultHomePage());
-  } else {
-    BrowserBack();
-  }
-}
-
-/**
- * Return the default start page for the cases when the user's own homepage is
- * infected, so we can get them somewhere safe.
- */
-function getDefaultHomePage() {
-  // Get the start page from the *default* pref branch, not the user's
-  var prefs = Services.prefs.getDefaultBranch(null);
-  var url = BROWSER_NEW_TAB_URL;
-  if (PrivateBrowsingUtils.isWindowPrivate(window))
-    return url;
-  try {
-    url = prefs.getComplexValue("browser.startup.homepage",
-                                Ci.nsIPrefLocalizedString).data;
-    // If url is a pipe-delimited set of pages, just take the first one.
-    if (url.includes("|"))
-      url = url.split("|")[0];
-  } catch (e) {
-    Cu.reportError("Couldn't get homepage pref: " + e);
-  }
-  return url;
-}
-
-function BrowserFullScreen() {
-  window.fullScreen = !window.fullScreen;
-}
-
-function getWebNavigation() {
-  return gBrowser.webNavigation;
-}
-
-function BrowserReloadWithFlags(reloadFlags) {
-  let url = gBrowser.currentURI.spec;
-  if (gBrowser.updateBrowserRemotenessByURL(gBrowser.selectedBrowser, url)) {
-    // If the remoteness has changed, the new browser doesn't have any
-    // information of what was loaded before, so we need to load the previous
-    // URL again.
-    gBrowser.loadURI(url, { flags: reloadFlags });
-    return;
-  }
-
-  // Do this after the above case where we might flip remoteness.
-  // Unfortunately, we'll count the remoteness flip case as a
-  // "newURL" load, since we're using loadURI, but hopefully
-  // that's rare enough to not matter.
-  maybeRecordAbandonmentTelemetry(gBrowser.selectedTab, "reload");
-
-  // Reset temporary permissions on the current tab. This is done here
-  // because we only want to reset permissions on user reload.
-  SitePermissions.clearTemporaryPermissions(gBrowser.selectedBrowser);
-
-  let windowUtils = window.QueryInterface(Ci.nsIInterfaceRequestor)
-                          .getInterface(Ci.nsIDOMWindowUtils);
-
-  gBrowser.selectedBrowser
-          .messageManager
-          .sendAsyncMessage("Browser:Reload",
-                            { flags: reloadFlags,
-                              handlingUserInput: windowUtils.isHandlingUserInput });
-}
-
-function getSecurityInfo(securityInfoAsString) {
-  if (!securityInfoAsString)
-    return null;
-
-  const serhelper = Cc["@mozilla.org/network/serialization-helper;1"]
-                       .getService(Ci.nsISerializationHelper);
-  let securityInfo = serhelper.deserializeObject(securityInfoAsString);
-  securityInfo.QueryInterface(Ci.nsITransportSecurityInfo);
-
-  return securityInfo;
-}
-
-/**
- * Returns a string with detailed information about the certificate validation
- * failure from the specified URI that can be used to send a report.
- */
-function getDetailedCertErrorInfo(location, securityInfo) {
-  if (!securityInfo)
-    return "";
-
-  let certErrorDetails = location;
-  let code = securityInfo.errorCode;
-  let errors = Cc["@mozilla.org/nss_errors_service;1"]
-                  .getService(Ci.nsINSSErrorsService);
-
-  certErrorDetails += "\r\n\r\n" + errors.getErrorMessage(errors.getXPCOMFromNSSError(code));
-
-  const sss = Cc["@mozilla.org/ssservice;1"]
-                 .getService(Ci.nsISiteSecurityService);
-  // SiteSecurityService uses different storage if the channel is
-  // private. Thus we must give isSecureURI correct flags or we
-  // might get incorrect results.
-  let flags = PrivateBrowsingUtils.isWindowPrivate(window) ?
-              Ci.nsISocketProvider.NO_PERMANENT_STORAGE : 0;
-
-  let uri = Services.io.newURI(location);
-
-  let hasHSTS = sss.isSecureURI(sss.HEADER_HSTS, uri, flags);
-  let hasHPKP = sss.isSecureURI(sss.HEADER_HPKP, uri, flags);
-  certErrorDetails += "\r\n\r\n" +
-                      gNavigatorBundle.getFormattedString("certErrorDetailsHSTS.label",
-                                                          [hasHSTS]);
-  certErrorDetails += "\r\n" +
-                      gNavigatorBundle.getFormattedString("certErrorDetailsKeyPinning.label",
-                                                          [hasHPKP]);
-
-  let certChain = "";
-  if (securityInfo.failedCertChain) {
-    let certs = securityInfo.failedCertChain.getEnumerator();
-    while (certs.hasMoreElements()) {
-      let cert = certs.getNext();
-      cert.QueryInterface(Ci.nsIX509Cert);
-      certChain += getPEMString(cert);
-    }
-  }
-
-  certErrorDetails += "\r\n\r\n" +
-                      gNavigatorBundle.getString("certErrorDetailsCertChain.label") +
-                      "\r\n\r\n" + certChain;
-
-  return certErrorDetails;
-}
-
-// TODO: can we pull getDERString and getPEMString in from pippki.js instead of
-// duplicating them here?
-function getDERString(cert) {
-  var length = {};
-  var derArray = cert.getRawDER(length);
-  var derString = "";
-  for (var i = 0; i < derArray.length; i++) {
-    derString += String.fromCharCode(derArray[i]);
-  }
-  return derString;
-}
-
-function getPEMString(cert) {
-  var derb64 = btoa(getDERString(cert));
-  // Wrap the Base64 string into lines of 64 characters,
-  // with CRLF line breaks (as specified in RFC 1421).
-  var wrapped = derb64.replace(/(\S{64}(?!$))/g, "$1\r\n");
-  return "-----BEGIN CERTIFICATE-----\r\n"
-         + wrapped
-         + "\r\n-----END CERTIFICATE-----\r\n";
-}
-
-var PrintPreviewListener = {
-  _printPreviewTab: null,
-  _simplifiedPrintPreviewTab: null,
-  _tabBeforePrintPreview: null,
-  _simplifyPageTab: null,
-  _lastRequestedPrintPreviewTab: null,
-
-  _createPPBrowser() {
-    let browser = this.getSourceBrowser();
-    let preferredRemoteType = browser.remoteType;
-    return gBrowser.loadOneTab("about:printpreview", {
-      inBackground: true,
-      preferredRemoteType,
-      sameProcessAsFrameLoader: browser.frameLoader,
-      triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
-    });
-  },
-  getPrintPreviewBrowser() {
-    if (!this._printPreviewTab) {
-      this._printPreviewTab = this._createPPBrowser();
-    }
-    gBrowser._allowTabChange = true;
-    this._lastRequestedPrintPreviewTab = gBrowser.selectedTab = this._printPreviewTab;
-    gBrowser._allowTabChange = false;
-    return gBrowser.getBrowserForTab(this._printPreviewTab);
-  },
-  getSimplifiedPrintPreviewBrowser() {
-    if (!this._simplifiedPrintPreviewTab) {
-      this._simplifiedPrintPreviewTab = this._createPPBrowser();
-    }
-    gBrowser._allowTabChange = true;
-    this._lastRequestedPrintPreviewTab = gBrowser.selectedTab = this._simplifiedPrintPreviewTab;
-    gBrowser._allowTabChange = false;
-    return gBrowser.getBrowserForTab(this._simplifiedPrintPreviewTab);
-  },
-  createSimplifiedBrowser() {
-    let browser = this.getSourceBrowser();
-    this._simplifyPageTab = gBrowser.loadOneTab("about:printpreview", {
-      inBackground: true,
-      sameProcessAsFrameLoader: browser.frameLoader,
-      triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
-     });
-    return this.getSimplifiedSourceBrowser();
-  },
-  getSourceBrowser() {
-    if (!this._tabBeforePrintPreview) {
-      this._tabBeforePrintPreview = gBrowser.selectedTab;
-    }
-    return this._tabBeforePrintPreview.linkedBrowser;
-  },
-  getSimplifiedSourceBrowser() {
-    return this._simplifyPageTab ?
-      gBrowser.getBrowserForTab(this._simplifyPageTab) : null;
-  },
-  getNavToolbox() {
-    return gNavToolbox;
-  },
-  onEnter() {
-    // We might have accidentally switched tabs since the user invoked print
-    // preview
-    if (gBrowser.selectedTab != this._lastRequestedPrintPreviewTab) {
-      gBrowser.selectedTab = this._lastRequestedPrintPreviewTab;
-    }
-    gInPrintPreviewMode = true;
-    this._toggleAffectedChrome();
-  },
-  onExit() {
-    gBrowser._allowTabChange = true;
-    gBrowser.selectedTab = this._tabBeforePrintPreview;
-    gBrowser._allowTabChange = false;
-    this._tabBeforePrintPreview = null;
-    gInPrintPreviewMode = false;
-    this._toggleAffectedChrome();
-    let tabsToRemove = ["_simplifyPageTab", "_printPreviewTab", "_simplifiedPrintPreviewTab"];
-    for (let tabProp of tabsToRemove) {
-      if (this[tabProp]) {
-        gBrowser.removeTab(this[tabProp]);
-        this[tabProp] = null;
-      }
-    }
-    gBrowser.deactivatePrintPreviewBrowsers();
-    this._lastRequestedPrintPreviewTab = null;
-  },
-  _toggleAffectedChrome() {
-    gNavToolbox.collapsed = gInPrintPreviewMode;
-
-    if (gInPrintPreviewMode)
-      this._hideChrome();
-    else
-      this._showChrome();
-
-    TabsInTitlebar.allowedBy("print-preview", !gInPrintPreviewMode);
-  },
-  _hideChrome() {
-    this._chromeState = {};
-
-    this._chromeState.sidebarOpen = SidebarUI.isOpen;
-    this._sidebarCommand = SidebarUI.currentID;
-    SidebarUI.hide();
-
-    var notificationBox = gBrowser.getNotificationBox();
-    this._chromeState.notificationsOpen = !notificationBox.notificationsHidden;
-    notificationBox.notificationsHidden = true;
-
-    this._chromeState.findOpen = gFindBarInitialized && !gFindBar.hidden;
-    if (gFindBarInitialized)
-      gFindBar.close();
-
-    var globalNotificationBox = document.getElementById("global-notificationbox");
-    this._chromeState.globalNotificationsOpen = !globalNotificationBox.notificationsHidden;
-    globalNotificationBox.notificationsHidden = true;
-
-    this._chromeState.syncNotificationsOpen = false;
-    var syncNotifications = document.getElementById("sync-notifications");
-    if (syncNotifications) {
-      this._chromeState.syncNotificationsOpen = !syncNotifications.notificationsHidden;
-      syncNotifications.notificationsHidden = true;
-    }
-  },
-  _showChrome() {
-    if (this._chromeState.notificationsOpen)
-      gBrowser.getNotificationBox().notificationsHidden = false;
-
-    if (this._chromeState.findOpen)
-      gLazyFindCommand("open");
-
-    if (this._chromeState.globalNotificationsOpen)
-      document.getElementById("global-notificationbox").notificationsHidden = false;
-
-    if (this._chromeState.syncNotificationsOpen)
-      document.getElementById("sync-notifications").notificationsHidden = false;
-
-    if (this._chromeState.sidebarOpen)
-      SidebarUI.show(this._sidebarCommand);
-  },
-
-  activateBrowser(browser) {
-    gBrowser.activateBrowserForPrintPreview(browser);
-  },
-};
-
-var browserDragAndDrop = {
-  canDropLink: aEvent => Services.droppedLinkHandler.canDropLink(aEvent, true),
-
-  dragOver(aEvent) {
-    if (this.canDropLink(aEvent)) {
-      aEvent.preventDefault();
-    }
-  },
-
-  getTriggeringPrincipal(aEvent) {
-    return Services.droppedLinkHandler.getTriggeringPrincipal(aEvent);
-  },
-
-  validateURIsForDrop(aEvent, aURIsCount, aURIs) {
-    return Services.droppedLinkHandler.validateURIsForDrop(aEvent,
-                                                           aURIsCount,
-                                                           aURIs);
-  },
-
-  dropLinks(aEvent, aDisallowInherit) {
-    return Services.droppedLinkHandler.dropLinks(aEvent, aDisallowInherit);
-  }
-};
-
-var homeButtonObserver = {
-  onDrop(aEvent) {
-      // disallow setting home pages that inherit the principal
-      let links = browserDragAndDrop.dropLinks(aEvent, true);
-      if (links.length) {
-        let urls = [];
-        for (let link of links) {
-          if (link.url.includes("|")) {
-            urls.push(...link.url.split("|"));
-          } else {
-            urls.push(link.url);
-          }
-        }
-
-        try {
-          browserDragAndDrop.validateURIsForDrop(aEvent, urls.length, urls);
-        } catch (e) {
-          return;
-        }
-
-        setTimeout(openHomeDialog, 0, urls.join("|"));
-      }
-    },
-
-  onDragOver(aEvent) {
-      if (Services.prefs.prefIsLocked("browser.startup.homepage")) {
-        return;
-      }
-      browserDragAndDrop.dragOver(aEvent);
-      aEvent.dropEffect = "link";
-    },
-  onDragExit(aEvent) {
-    }
-};
-
-function openHomeDialog(aURL) {
-  var promptTitle = gNavigatorBundle.getString("droponhometitle");
-  var promptMsg;
-  if (aURL.includes("|")) {
-    promptMsg = gNavigatorBundle.getString("droponhomemsgMultiple");
-  } else {
-    promptMsg = gNavigatorBundle.getString("droponhomemsg");
-  }
-
-  var pressedVal  = Services.prompt.confirmEx(window, promptTitle, promptMsg,
-                          Services.prompt.STD_YES_NO_BUTTONS,
-                          null, null, null, null, {value: 0});
-
-  if (pressedVal == 0) {
-    try {
-      Services.prefs.setStringPref("browser.startup.homepage", aURL);
-    } catch (ex) {
-      dump("Failed to set the home page.\n" + ex + "\n");
-    }
-  }
-}
-
-var newTabButtonObserver = {
-  onDragOver(aEvent) {
-    browserDragAndDrop.dragOver(aEvent);
-  },
-  onDragExit(aEvent) {},
-  async onDrop(aEvent) {
-    let shiftKey = aEvent.shiftKey;
-    let links = browserDragAndDrop.dropLinks(aEvent);
-    let triggeringPrincipal = browserDragAndDrop.getTriggeringPrincipal(aEvent);
-
-    if (links.length >= Services.prefs.getIntPref("browser.tabs.maxOpenBeforeWarn")) {
-      // Sync dialog cannot be used inside drop event handler.
-      let answer = await OpenInTabsUtils.promiseConfirmOpenInTabs(links.length,
-                                                                  window);
-      if (!answer) {
-        return;
-      }
-    }
-
-    for (let link of links) {
-      if (link.url) {
-        let data = await getShortcutOrURIAndPostData(link.url);
-        // Allow third-party services to fixup this URL.
-        openNewTabWith(data.url, shiftKey, {
-          postData: data.postData,
-          allowThirdPartyFixup: true,
-          triggeringPrincipal,
-        });
-      }
-    }
-  }
-};
-
-var newWindowButtonObserver = {
-  onDragOver(aEvent) {
-    browserDragAndDrop.dragOver(aEvent);
-  },
-  onDragExit(aEvent) {},
-  async onDrop(aEvent) {
-    let links = browserDragAndDrop.dropLinks(aEvent);
-    let triggeringPrincipal = browserDragAndDrop.getTriggeringPrincipal(aEvent);
-
-    if (links.length >= Services.prefs.getIntPref("browser.tabs.maxOpenBeforeWarn")) {
-      // Sync dialog cannot be used inside drop event handler.
-      let answer = await OpenInTabsUtils.promiseConfirmOpenInTabs(links.length,
-                                                                  window);
-      if (!answer) {
-        return;
-      }
-    }
-
-    for (let link of links) {
-      if (link.url) {
-        let data = await getShortcutOrURIAndPostData(link.url);
-        // Allow third-party services to fixup this URL.
-        openNewWindowWith(data.url, {
-          postData: data.postData,
-          allowThirdPartyFixup: true,
-          triggeringPrincipal,
-        });
-      }
-    }
-  }
-};
-const DOMEventHandler = {
-  init() {
-    let mm = window.messageManager;
-    mm.addMessageListener("Link:AddFeed", this);
-    mm.addMessageListener("Link:SetIcon", this);
-    mm.addMessageListener("Link:AddSearch", this);
-    mm.addMessageListener("Meta:SetPageInfo", this);
-  },
-
-  receiveMessage(aMsg) {
-    switch (aMsg.name) {
-      case "Link:AddFeed":
-        let link = {type: aMsg.data.type, href: aMsg.data.href, title: aMsg.data.title};
-        FeedHandler.addFeed(link, aMsg.target);
-        break;
-
-      case "Link:SetIcon":
-        this.setIcon(aMsg.target, aMsg.data.url, aMsg.data.loadingPrincipal,
-                     aMsg.data.requestContextID, aMsg.data.canUseForTab);
-        break;
-
-      case "Link:AddSearch":
-        this.addSearch(aMsg.target, aMsg.data.engine, aMsg.data.url);
-        break;
-
-      case "Meta:SetPageInfo":
-        this.setPageInfo(aMsg.data);
-        break;
-    }
-  },
-
-  setPageInfo(aData) {
-    const {url, description, previewImageURL} = aData;
-    gBrowser.setPageInfo(url, description, previewImageURL);
-    return true;
-  },
-
-  setIcon(aBrowser, aURL, aLoadingPrincipal, aRequestContextID = 0, aCanUseForTab = true) {
-    if (gBrowser.isFailedIcon(aURL))
-      return false;
-
-    let tab = gBrowser.getTabForBrowser(aBrowser);
-    if (!tab)
-      return false;
-
-    let loadingPrincipal = aLoadingPrincipal ||
-                           Services.scriptSecurityManager.getSystemPrincipal();
-    if (aURL) {
-      gBrowser.storeIcon(aBrowser, aURL, loadingPrincipal, aRequestContextID);
-    }
-    if (aCanUseForTab) {
-      gBrowser.setIcon(tab, aURL, loadingPrincipal, aRequestContextID);
-    }
-    return true;
-  },
-
-  addSearch(aBrowser, aEngine, aURL) {
-    let tab = gBrowser.getTabForBrowser(aBrowser);
-    if (!tab)
-      return;
-
-    BrowserSearch.addEngine(aBrowser, aEngine, makeURI(aURL));
-  },
-};
-
-const BrowserSearch = {
-  init() {
-    Services.obs.addObserver(this, "browser-search-engine-modified");
-  },
-
-  uninit() {
-    Services.obs.removeObserver(this, "browser-search-engine-modified");
-  },
-
-  observe(engine, topic, data) {
-    // There are two kinds of search engine objects, nsISearchEngine objects and
-    // plain { uri, title, icon } objects.  `engine` in this method is the
-    // former.  The browser.engines and browser.hiddenEngines arrays are the
-    // latter, and they're the engines offered by the the page in the browser.
-    //
-    // The two types of engines are currently related by their titles/names,
-    // although that may change; see bug 335102.
-    let engineName = engine.wrappedJSObject.name;
-    switch (data) {
-    case "engine-removed":
-      // An engine was removed from the search service.  If a page is offering
-      // the engine, then the engine needs to be added back to the corresponding
-      // browser's offered engines.
-      this._addMaybeOfferedEngine(engineName);
-      break;
-    case "engine-added":
-      // An engine was added to the search service.  If a page is offering the
-      // engine, then the engine needs to be removed from the corresponding
-      // browser's offered engines.
-      this._removeMaybeOfferedEngine(engineName);
-      break;
-    }
-  },
-
-  _addMaybeOfferedEngine(engineName) {
-    let selectedBrowserOffersEngine = false;
-    for (let browser of gBrowser.browsers) {
-      for (let i = 0; i < (browser.hiddenEngines || []).length; i++) {
-        if (browser.hiddenEngines[i].title == engineName) {
-          if (!browser.engines) {
-            browser.engines = [];
-          }
-          browser.engines.push(browser.hiddenEngines[i]);
-          browser.hiddenEngines.splice(i, 1);
-          if (browser == gBrowser.selectedBrowser) {
-            selectedBrowserOffersEngine = true;
-          }
-          break;
-        }
-      }
-    }
-    if (selectedBrowserOffersEngine) {
-      this.updateOpenSearchBadge();
-    }
-  },
-
-  _removeMaybeOfferedEngine(engineName) {
-    let selectedBrowserOffersEngine = false;
-    for (let browser of gBrowser.browsers) {
-      for (let i = 0; i < (browser.engines || []).length; i++) {
-        if (browser.engines[i].title == engineName) {
-          if (!browser.hiddenEngines) {
-            browser.hiddenEngines = [];
-          }
-          browser.hiddenEngines.push(browser.engines[i]);
-          browser.engines.splice(i, 1);
-          if (browser == gBrowser.selectedBrowser) {
-            selectedBrowserOffersEngine = true;
-          }
-          break;
-        }
-      }
-    }
-    if (selectedBrowserOffersEngine) {
-      this.updateOpenSearchBadge();
-    }
-  },
-
-  addEngine(browser, engine, uri) {
-    // Check to see whether we've already added an engine with this title
-    if (browser.engines) {
-      if (browser.engines.some(e => e.title == engine.title))
-        return;
-    }
-
-    var hidden = false;
-    // If this engine (identified by title) is already in the list, add it
-    // to the list of hidden engines rather than to the main list.
-    // XXX This will need to be changed when engines are identified by URL;
-    // see bug 335102.
-    if (Services.search.getEngineByName(engine.title))
-      hidden = true;
-
-    var engines = (hidden ? browser.hiddenEngines : browser.engines) || [];
-
-    engines.push({ uri: engine.href,
-                   title: engine.title,
-                   get icon() { return browser.mIconURL; }
-                 });
-
-    if (hidden)
-      browser.hiddenEngines = engines;
-    else {
-      browser.engines = engines;
-      if (browser == gBrowser.selectedBrowser)
-        this.updateOpenSearchBadge();
-    }
-  },
-
-  /**
-   * Update the browser UI to show whether or not additional engines are
-   * available when a page is loaded or the user switches tabs to a page that
-   * has search engines.
-   */
-  updateOpenSearchBadge() {
-    BrowserPageActions.addSearchEngine.updateEngines();
-
-    var searchBar = this.searchBar;
-    if (!searchBar)
-      return;
-
-    var engines = gBrowser.selectedBrowser.engines;
-    if (engines && engines.length > 0)
-      searchBar.setAttribute("addengines", "true");
-    else
-      searchBar.removeAttribute("addengines");
-  },
-
-  /**
-   * Gives focus to the search bar, if it is present on the toolbar, or loads
-   * the default engine's search form otherwise. For Mac, opens a new window
-   * or focuses an existing window, if necessary.
-   */
-  webSearch: function BrowserSearch_webSearch() {
-    if (window.location.href != getBrowserURL()) {
-      var win = getTopWin();
-      if (win) {
-        // If there's an open browser window, it should handle this command
-        win.focus();
-        win.BrowserSearch.webSearch();
-      } else {
-        // If there are no open browser windows, open a new one
-        var observer = function(subject, topic, data) {
-          if (subject == win) {
-            BrowserSearch.webSearch();
-            Services.obs.removeObserver(observer, "browser-delayed-startup-finished");
-          }
-        };
-        win = window.openDialog(getBrowserURL(), "_blank",
-                                "chrome,all,dialog=no", "about:blank");
-        Services.obs.addObserver(observer, "browser-delayed-startup-finished");
-      }
-      return;
-    }
-
-    let focusUrlBarIfSearchFieldIsNotActive = function(aSearchBar) {
-      if (!aSearchBar || document.activeElement != aSearchBar.textbox.inputField) {
-        focusAndSelectUrlBar(true);
-      }
-    };
-
-    let searchBar = this.searchBar;
-    let placement = CustomizableUI.getPlacementOfWidget("search-container");
-    let focusSearchBar = () => {
-      searchBar = this.searchBar;
-      searchBar.select();
-      focusUrlBarIfSearchFieldIsNotActive(searchBar);
-    };
-    if (placement && searchBar &&
-        ((searchBar.parentNode.getAttribute("overflowedItem") == "true" &&
-          placement.area == CustomizableUI.AREA_NAVBAR) ||
-         placement.area == CustomizableUI.AREA_FIXED_OVERFLOW_PANEL)) {
-      let navBar = document.getElementById(CustomizableUI.AREA_NAVBAR);
-      navBar.overflowable.show().then(focusSearchBar);
-      return;
-    }
-    if (searchBar) {
-      if (window.fullScreen)
-        FullScreen.showNavToolbox();
-      searchBar.select();
-    }
-    focusUrlBarIfSearchFieldIsNotActive(searchBar);
-  },
-
-  /**
-   * Loads a search results page, given a set of search terms. Uses the current
-   * engine if the search bar is visible, or the default engine otherwise.
-   *
-   * @param searchText
-   *        The search terms to use for the search.
-   *
-   * @param useNewTab
-   *        Boolean indicating whether or not the search should load in a new
-   *        tab.
-   *
-   * @param purpose [optional]
-   *        A string meant to indicate the context of the search request. This
-   *        allows the search service to provide a different nsISearchSubmission
-   *        depending on e.g. where the search is triggered in the UI.
-   *
-   * @return engine The search engine used to perform a search, or null if no
-   *                search was performed.
-   */
-  _loadSearch(searchText, useNewTab, purpose) {
-    let engine;
-
-    // If the search bar is visible, use the current engine, otherwise, fall
-    // back to the default engine.
-    if (isElementVisible(this.searchBar))
-      engine = Services.search.currentEngine;
-    else
-      engine = Services.search.defaultEngine;
-
-    let submission = engine.getSubmission(searchText, null, purpose); // HTML response
-
-    // getSubmission can return null if the engine doesn't have a URL
-    // with a text/html response type.  This is unlikely (since
-    // SearchService._addEngineToStore() should fail for such an engine),
-    // but let's be on the safe side.
-    if (!submission) {
-      return null;
-    }
-
-    let inBackground = Services.prefs.getBoolPref("browser.search.context.loadInBackground");
-    openLinkIn(submission.uri.spec,
-               useNewTab ? "tab" : "current",
-               { postData: submission.postData,
-                 inBackground,
-                 relatedToCurrent: true });
-
-    return engine;
-  },
-
-  /**
-   * Just like _loadSearch, but preserving an old API.
-   *
-   * @return string Name of the search engine used to perform a search or null
-   *         if a search was not performed.
-   */
-  loadSearch: function BrowserSearch_search(searchText, useNewTab, purpose) {
-    let engine = BrowserSearch._loadSearch(searchText, useNewTab, purpose);
-    if (!engine) {
-      return null;
-    }
-    return engine.name;
-  },
-
-  /**
-   * Perform a search initiated from the context menu.
-   *
-   * This should only be called from the context menu. See
-   * BrowserSearch.loadSearch for the preferred API.
-   */
-  loadSearchFromContext(terms) {
-    let engine = BrowserSearch._loadSearch(terms, true, "contextmenu");
-    if (engine) {
-      BrowserSearch.recordSearchInTelemetry(engine, "contextmenu");
-    }
-  },
-
-  pasteAndSearch(event) {
-    BrowserSearch.searchBar.select();
-    goDoCommand("cmd_paste");
-    BrowserSearch.searchBar.handleSearchCommand(event);
-  },
-
-  /**
-   * Returns the search bar element if it is present in the toolbar, null otherwise.
-   */
-  get searchBar() {
-    return document.getElementById("searchbar");
-  },
-
-  get searchEnginesURL() {
-    return formatURL("browser.search.searchEnginesURL", true);
-  },
-
-  loadAddEngines: function BrowserSearch_loadAddEngines() {
-    var newWindowPref = Services.prefs.getIntPref("browser.link.open_newwindow");
-    var where = newWindowPref == 3 ? "tab" : "window";
-    openUILinkIn(this.searchEnginesURL, where);
-  },
-
-  _getSearchEngineId(engine) {
-    if (engine && engine.identifier) {
-      return engine.identifier;
-    }
-
-    if (!engine || (engine.name === undefined))
-      return "other";
-
-    return "other-" + engine.name;
-  },
-
-  /**
-   * Helper to record a search with Telemetry.
-   *
-   * Telemetry records only search counts and nothing pertaining to the search itself.
-   *
-   * @param engine
-   *        (nsISearchEngine) The engine handling the search.
-   * @param source
-   *        (string) Where the search originated from. See BrowserUsageTelemetry for
-   *        allowed values.
-   * @param details [optional]
-   *        An optional parameter passed to |BrowserUsageTelemetry.recordSearch|.
-   *        See its documentation for allowed options.
-   *        Additionally, if the search was a suggested search, |details.selection|
-   *        indicates where the item was in the suggestion list and how the user
-   *        selected it: {selection: {index: The selected index, kind: "key" or "mouse"}}
-   */
-  recordSearchInTelemetry(engine, source, details = {}) {
-    BrowserUITelemetry.countSearchEvent(source, null, details.selection);
-    try {
-      BrowserUsageTelemetry.recordSearch(engine, source, details);
-    } catch (ex) {
-      Cu.reportError(ex);
-    }
-  },
-
-  /**
-   * Helper to record a one-off search with Telemetry.
-   *
-   * Telemetry records only search counts and nothing pertaining to the search itself.
-   *
-   * @param engine
-   *        (nsISearchEngine) The engine handling the search.
-   * @param source
-   *        (string) Where the search originated from. See BrowserUsageTelemetry for
-   *        allowed values.
-   * @param type
-   *        (string) Indicates how the user selected the search item.
-   * @param where
-   *        (string) Where was the search link opened (e.g. new tab, current tab, ..).
-   */
-  recordOneoffSearchInTelemetry(engine, source, type, where) {
-    let id = this._getSearchEngineId(engine) + "." + source;
-    BrowserUITelemetry.countOneoffSearchEvent(id, type, where);
-    try {
-      const details = {type, isOneOff: true};
-      BrowserUsageTelemetry.recordSearch(engine, source, details);
-    } catch (ex) {
-      Cu.reportError(ex);
-    }
-  }
-};
-
-XPCOMUtils.defineConstant(this, "BrowserSearch", BrowserSearch);
-
-function FillHistoryMenu(aParent) {
-  // Lazily add the hover listeners on first showing and never remove them
-  if (!aParent.hasStatusListener) {
-    // Show history item's uri in the status bar when hovering, and clear on exit
-    aParent.addEventListener("DOMMenuItemActive", function(aEvent) {
-      // Only the current page should have the checked attribute, so skip it
-      if (!aEvent.target.hasAttribute("checked"))
-        XULBrowserWindow.setOverLink(aEvent.target.getAttribute("uri"));
-    });
-    aParent.addEventListener("DOMMenuItemInactive", function() {
-      XULBrowserWindow.setOverLink("");
-    });
-
-    aParent.hasStatusListener = true;
-  }
-
-  // Remove old entries if any
-  let children = aParent.childNodes;
-  for (var i = children.length - 1; i >= 0; --i) {
-    if (children[i].hasAttribute("index"))
-      aParent.removeChild(children[i]);
-  }
-
-  const MAX_HISTORY_MENU_ITEMS = 15;
-
-  const tooltipBack = gNavigatorBundle.getString("tabHistory.goBack");
-  const tooltipCurrent = gNavigatorBundle.getString("tabHistory.current");
-  const tooltipForward = gNavigatorBundle.getString("tabHistory.goForward");
-
-  function updateSessionHistory(sessionHistory, initial) {
-    let count = sessionHistory.entries.length;
-
-    if (!initial) {
-      if (count <= 1) {
-        // if there is only one entry now, close the popup.
-        aParent.hidePopup();
-        return;
-      } else if (aParent.id != "backForwardMenu" && !aParent.parentNode.open) {
-        // if the popup wasn't open before, but now needs to be, reopen the menu.
-        // It should trigger FillHistoryMenu again. This might happen with the
-        // delay from click-and-hold menus but skip this for the context menu
-        // (backForwardMenu) rather than figuring out how the menu should be
-        // positioned and opened as it is an extreme edgecase.
-        aParent.parentNode.open = true;
-        return;
-      }
-    }
-
-    let index = sessionHistory.index;
-    let half_length = Math.floor(MAX_HISTORY_MENU_ITEMS / 2);
-    let start = Math.max(index - half_length, 0);
-    let end = Math.min(start == 0 ? MAX_HISTORY_MENU_ITEMS : index + half_length + 1, count);
-    if (end == count) {
-      start = Math.max(count - MAX_HISTORY_MENU_ITEMS, 0);
-    }
-
-    let existingIndex = 0;
-
-    for (let j = end - 1; j >= start; j--) {
-      let entry = sessionHistory.entries[j];
-      let uri = entry.url;
-
-      let item = existingIndex < children.length ?
-                   children[existingIndex] : document.createElement("menuitem");
-
-      item.setAttribute("uri", uri);
-      item.setAttribute("label", entry.title || uri);
-      item.setAttribute("index", j);
-
-      // Cache this so that gotoHistoryIndex doesn't need the original index
-      item.setAttribute("historyindex", j - index);
-
-      if (j != index) {
-        // Use list-style-image rather than the image attribute in order to
-        // allow CSS to override this.
-        item.style.listStyleImage = `url(page-icon:${uri})`;
-      }
-
-      if (j < index) {
-        item.className = "unified-nav-back menuitem-iconic menuitem-with-favicon";
-        item.setAttribute("tooltiptext", tooltipBack);
-      } else if (j == index) {
-        item.setAttribute("type", "radio");
-        item.setAttribute("checked", "true");
-        item.className = "unified-nav-current";
-        item.setAttribute("tooltiptext", tooltipCurrent);
-      } else {
-        item.className = "unified-nav-forward menuitem-iconic menuitem-with-favicon";
-        item.setAttribute("tooltiptext", tooltipForward);
-      }
-
-      if (!item.parentNode) {
-        aParent.appendChild(item);
-      }
-
-      existingIndex++;
-    }
-
-    if (!initial) {
-      let existingLength = children.length;
-      while (existingIndex < existingLength) {
-        aParent.removeChild(aParent.lastChild);
-        existingIndex++;
-      }
-    }
-  }
-
-  let sessionHistory = SessionStore.getSessionHistory(gBrowser.selectedTab, updateSessionHistory);
-  if (!sessionHistory)
-    return false;
-
-  // don't display the popup for a single item
-  if (sessionHistory.entries.length <= 1)
-    return false;
-
-  updateSessionHistory(sessionHistory, true);
-  return true;
-}
-
-function addToUrlbarHistory(aUrlToAdd) {
-  if (!PrivateBrowsingUtils.isWindowPrivate(window) &&
-      aUrlToAdd &&
-      !aUrlToAdd.includes(" ") &&
-      !/[\x00-\x1F]/.test(aUrlToAdd)) // eslint-disable-line no-control-regex
-    PlacesUIUtils.markPageAsTyped(aUrlToAdd);
-}
-
-function BrowserDownloadsUI() {
-  if (PrivateBrowsingUtils.isWindowPrivate(window)) {
-    openUILinkIn("about:downloads", "tab");
-  } else {
-    PlacesCommandHook.showPlacesOrganizer("Downloads");
-  }
-}
-
-function toOpenWindowByType(inType, uri, features) {
-  var topWindow = Services.wm.getMostRecentWindow(inType);
-
-  if (topWindow)
-    topWindow.focus();
-  else if (features)
-    window.open(uri, "_blank", features);
-  else
-    window.open(uri, "_blank", "chrome,extrachrome,menubar,resizable,scrollbars,status,toolbar");
-}
-
-function OpenBrowserWindow(options) {
-  var telemetryObj = {};
-  TelemetryStopwatch.start("FX_NEW_WINDOW_MS", telemetryObj);
-
-  var handler = Cc["@mozilla.org/browser/clh;1"]
-                  .getService(Ci.nsIBrowserHandler);
-  var defaultArgs = handler.defaultArgs;
-  var wintype = document.documentElement.getAttribute("windowtype");
-
-  var extraFeatures = "";
-  if (options && options.private && PrivateBrowsingUtils.enabled) {
-    extraFeatures = ",private";
-    if (!PrivateBrowsingUtils.permanentPrivateBrowsing) {
-      // Force the new window to load about:privatebrowsing instead of the default home page
-      defaultArgs = "about:privatebrowsing";
-    }
-  } else {
-    extraFeatures = ",non-private";
-  }
-
-  if (options && options.remote) {
-    extraFeatures += ",remote";
-  } else if (options && options.remote === false) {
-    extraFeatures += ",non-remote";
-  }
-
-  // If the window is maximized, we want to skip the animation, since we're
-  // going to be taking up most of the screen anyways, and we want to optimize
-  // for showing the user a useful window as soon as possible.
-  if (window.windowState == window.STATE_MAXIMIZED) {
-    extraFeatures += ",suppressanimation";
-  }
-
-  // if and only if the current window is a browser window and it has a document with a character
-  // set, then extract the current charset menu setting from the current document and use it to
-  // initialize the new browser window...
-  var win;
-  if (window && (wintype == "navigator:browser") && window.content && window.content.document) {
-    var DocCharset = window.content.document.characterSet;
-    let charsetArg = "charset=" + DocCharset;
-
-    // we should "inherit" the charset menu setting in a new window
-    win = window.openDialog("chrome://browser/content/", "_blank", "chrome,all,dialog=no" + extraFeatures, defaultArgs, charsetArg);
-  } else {
-    // forget about the charset information.
-    win = window.openDialog("chrome://browser/content/", "_blank", "chrome,all,dialog=no" + extraFeatures, defaultArgs);
-  }
-
-  win.addEventListener("MozAfterPaint", () => {
-    TelemetryStopwatch.finish("FX_NEW_WINDOW_MS", telemetryObj);
-  }, {once: true});
-
-  return win;
-}
-
-/**
- * Update the global flag that tracks whether or not any edit UI (the Edit menu,
- * edit-related items in the context menu, and edit-related toolbar buttons
- * is visible, then update the edit commands' enabled state accordingly.  We use
- * this flag to skip updating the edit commands on focus or selection changes
- * when no UI is visible to improve performance (including pageload performance,
- * since focus changes when you load a new page).
- *
- * If UI is visible, we use goUpdateGlobalEditMenuItems to set the commands'
- * enabled state so the UI will reflect it appropriately.
- *
- * If the UI isn't visible, we enable all edit commands so keyboard shortcuts
- * still work and just lazily disable them as needed when the user presses a
- * shortcut.
- *
- * This doesn't work on Mac, since Mac menus flash when users press their
- * keyboard shortcuts, so edit UI is essentially always visible on the Mac,
- * and we need to always update the edit commands.  Thus on Mac this function
- * is a no op.
- */
-function updateEditUIVisibility() {
-  if (AppConstants.platform == "macosx")
-    return;
-
-  let editMenuPopupState = document.getElementById("menu_EditPopup").state;
-  let contextMenuPopupState = document.getElementById("contentAreaContextMenu").state;
-  let placesContextMenuPopupState = document.getElementById("placesContext").state;
-
-  let oldVisible = gEditUIVisible;
-
-  // The UI is visible if the Edit menu is opening or open, if the context menu
-  // is open, or if the toolbar has been customized to include the Cut, Copy,
-  // or Paste toolbar buttons.
-  gEditUIVisible = editMenuPopupState == "showing" ||
-                   editMenuPopupState == "open" ||
-                   contextMenuPopupState == "showing" ||
-                   contextMenuPopupState == "open" ||
-                   placesContextMenuPopupState == "showing" ||
-                   placesContextMenuPopupState == "open";
-  const kOpenPopupStates = ["showing", "open"];
-  if (!gEditUIVisible) {
-    // Now check the edit-controls toolbar buttons.
-    let placement = CustomizableUI.getPlacementOfWidget("edit-controls");
-    let areaType = placement ? CustomizableUI.getAreaType(placement.area) : "";
-    if (areaType == CustomizableUI.TYPE_MENU_PANEL) {
-      let customizablePanel = PanelUI.overflowPanel;
-      gEditUIVisible = kOpenPopupStates.includes(customizablePanel.state);
-    } else if (areaType == CustomizableUI.TYPE_TOOLBAR && window.toolbar.visible) {
-      // The edit controls are on a toolbar, so they are visible,
-      // unless they're in a panel that isn't visible...
-      if (placement.area == "nav-bar") {
-        let editControls = document.getElementById("edit-controls");
-        gEditUIVisible = !editControls.hasAttribute("overflowedItem") ||
-                          kOpenPopupStates.includes(document.getElementById("widget-overflow").state);
-      } else {
-        gEditUIVisible = true;
-      }
-    }
-  }
-
-  // Now check the main menu panel
-  if (!gEditUIVisible) {
-    gEditUIVisible = kOpenPopupStates.includes(PanelUI.panel.state);
-  }
-
-  // No need to update commands if the edit UI visibility has not changed.
-  if (gEditUIVisible == oldVisible) {
-    return;
-  }
-
-  // If UI is visible, update the edit commands' enabled state to reflect
-  // whether or not they are actually enabled for the current focus/selection.
-  if (gEditUIVisible) {
-    goUpdateGlobalEditMenuItems();
-  } else {
-    // Otherwise, enable all commands, so that keyboard shortcuts still work,
-    // then lazily determine their actual enabled state when the user presses
-    // a keyboard shortcut.
-    goSetCommandEnabled("cmd_undo", true);
-    goSetCommandEnabled("cmd_redo", true);
-    goSetCommandEnabled("cmd_cut", true);
-    goSetCommandEnabled("cmd_copy", true);
-    goSetCommandEnabled("cmd_paste", true);
-    goSetCommandEnabled("cmd_selectAll", true);
-    goSetCommandEnabled("cmd_delete", true);
-    goSetCommandEnabled("cmd_switchTextDirection", true);
-  }
-}
-
-/**
- * Opens a new tab with the userContextId specified as an attribute of
- * sourceEvent. This attribute is propagated to the top level originAttributes
- * living on the tab's docShell.
- *
- * @param event
- *        A click event on a userContext File Menu option
- */
-function openNewUserContextTab(event) {
-  openUILinkIn(BROWSER_NEW_TAB_URL, "tab", {
-    userContextId: parseInt(event.target.getAttribute("data-usercontextid")),
-  });
-}
-
-/**
- * Updates File Menu User Context UI visibility depending on
- * privacy.userContext.enabled pref state.
- */
-function updateUserContextUIVisibility() {
-  let menu = document.getElementById("menu_newUserContext");
-  menu.hidden = !Services.prefs.getBoolPref("privacy.userContext.enabled");
-  if (PrivateBrowsingUtils.isWindowPrivate(window)) {
-    menu.setAttribute("disabled", "true");
-  }
-}
-
-/**
- * Updates the User Context UI indicators if the browser is in a non-default context
- */
-function updateUserContextUIIndicator() {
-  let hbox = document.getElementById("userContext-icons");
-
-  let userContextId = gBrowser.selectedBrowser.getAttribute("usercontextid");
-  if (!userContextId) {
-    hbox.setAttribute("data-identity-color", "");
-    hbox.hidden = true;
-    return;
-  }
-
-  let identity = ContextualIdentityService.getPublicIdentityFromId(userContextId);
-  if (!identity) {
-    hbox.setAttribute("data-identity-color", "");
-    hbox.hidden = true;
-    return;
-  }
-
-  hbox.setAttribute("data-identity-color", identity.color);
-
-  let label = document.getElementById("userContext-label");
-  label.setAttribute("value", ContextualIdentityService.getUserContextLabel(userContextId));
-
-  let indicator = document.getElementById("userContext-indicator");
-  indicator.setAttribute("data-identity-icon", identity.icon);
-
-  hbox.hidden = false;
-}
-
-/**
- * Makes the Character Encoding menu enabled or disabled as appropriate.
- * To be called when the View menu or the app menu is opened.
- */
-function updateCharacterEncodingMenuState() {
-  let charsetMenu = document.getElementById("charsetMenu");
-  // gBrowser is null on Mac when the menubar shows in the context of
-  // non-browser windows. The above elements may be null depending on
-  // what parts of the menubar are present. E.g. no app menu on Mac.
-  if (gBrowser && gBrowser.selectedBrowser.mayEnableCharacterEncodingMenu) {
-    if (charsetMenu) {
-      charsetMenu.removeAttribute("disabled");
-    }
-  } else if (charsetMenu) {
-    charsetMenu.setAttribute("disabled", "true");
-  }
-}
-
-var XULBrowserWindow = {
-  // Stored Status, Link and Loading values
-  status: "",
-  defaultStatus: "",
-  overLink: "",
-  startTime: 0,
-  isBusy: false,
-  busyUI: false,
-
-  QueryInterface(aIID) {
-    if (aIID.equals(Ci.nsIWebProgressListener) ||
-        aIID.equals(Ci.nsIWebProgressListener2) ||
-        aIID.equals(Ci.nsISupportsWeakReference) ||
-        aIID.equals(Ci.nsIXULBrowserWindow) ||
-        aIID.equals(Ci.nsISupports))
-      return this;
-    throw Cr.NS_NOINTERFACE;
-  },
-
-  get stopCommand() {
-    delete this.stopCommand;
-    return this.stopCommand = document.getElementById("Browser:Stop");
-  },
-  get reloadCommand() {
-    delete this.reloadCommand;
-    return this.reloadCommand = document.getElementById("Browser:Reload");
-  },
-  get isImage() {
-    delete this.isImage;
-    return this.isImage = document.getElementById("isImage");
-  },
-  get canViewSource() {
-    delete this.canViewSource;
-    return this.canViewSource = document.getElementById("canViewSource");
-  },
-
-  setJSStatus() {
-    // unsupported
-  },
-
-  forceInitialBrowserRemote(aRemoteType) {
-    gBrowser.updateBrowserRemoteness(gBrowser.initialBrowser, true, { remoteType: aRemoteType });
-  },
-
-  forceInitialBrowserNonRemote(aOpener) {
-    gBrowser.updateBrowserRemoteness(gBrowser.initialBrowser, false, { opener: aOpener });
-  },
-
-  setDefaultStatus(status) {
-    this.defaultStatus = status;
-    StatusPanel.update();
-  },
-
-  setOverLink(url, anchorElt) {
-    if (url) {
-      url = Services.textToSubURI.unEscapeURIForUI("UTF-8", url);
-
-      // Encode bidirectional formatting characters.
-      // (RFC 3987 sections 3.2 and 4.1 paragraph 6)
-      url = url.replace(/[\u200e\u200f\u202a\u202b\u202c\u202d\u202e]/g,
-                        encodeURIComponent);
-
-      if (gURLBar && gURLBar._mayTrimURLs /* corresponds to browser.urlbar.trimURLs */)
-        url = trimURL(url);
-    }
-
-    this.overLink = url;
-    LinkTargetDisplay.update();
-  },
-
-  showTooltip(x, y, tooltip, direction, browser) {
-    if (Cc["@mozilla.org/widget/dragservice;1"].getService(Ci.nsIDragService).
-        getCurrentSession()) {
-      return;
-    }
-
-    // The x,y coordinates are relative to the <browser> element using
-    // the chrome zoom level.
-    let elt = document.getElementById("remoteBrowserTooltip");
-    elt.label = tooltip;
-    elt.style.direction = direction;
-
-    elt.openPopupAtScreen(browser.boxObject.screenX + x, browser.boxObject.screenY + y, false, null);
-  },
-
-  hideTooltip() {
-    let elt = document.getElementById("remoteBrowserTooltip");
-    elt.hidePopup();
-  },
-
-  getTabCount() {
-    return gBrowser.tabs.length;
-  },
-
-  // Called before links are navigated to to allow us to retarget them if needed.
-  onBeforeLinkTraversal(originalTarget, linkURI, linkNode, isAppTab) {
-    return BrowserUtils.onBeforeLinkTraversal(originalTarget, linkURI, linkNode, isAppTab);
-  },
-
-  // Check whether this URI should load in the current process
-  shouldLoadURI(aDocShell, aURI, aReferrer, aHasPostData, aTriggeringPrincipal) {
-    if (!gMultiProcessBrowser)
-      return true;
-
-    let browser = aDocShell.QueryInterface(Ci.nsIDocShellTreeItem)
-                           .sameTypeRootTreeItem
-                           .QueryInterface(Ci.nsIDocShell)
-                           .chromeEventHandler;
-
-    // Ignore loads that aren't in the main tabbrowser
-    if (browser.localName != "browser" || !browser.getTabBrowser || browser.getTabBrowser() != gBrowser)
-      return true;
-
-    if (!E10SUtils.shouldLoadURI(aDocShell, aURI, aReferrer, aHasPostData)) {
-      // XXX: Do we want to complain if we have post data but are still
-      // redirecting the load? Perhaps a telemetry probe? Theoretically we
-      // shouldn't do this, as it throws out data. See bug 1348018.
-      E10SUtils.redirectLoad(aDocShell, aURI, aReferrer, aTriggeringPrincipal, false);
-      return false;
-    }
-
-    return true;
-  },
-
-  onProgressChange(aWebProgress, aRequest,
-                             aCurSelfProgress, aMaxSelfProgress,
-                             aCurTotalProgress, aMaxTotalProgress) {
-    // Do nothing.
-  },
-
-  onProgressChange64(aWebProgress, aRequest,
-                               aCurSelfProgress, aMaxSelfProgress,
-                               aCurTotalProgress, aMaxTotalProgress) {
-    return this.onProgressChange(aWebProgress, aRequest,
-      aCurSelfProgress, aMaxSelfProgress, aCurTotalProgress,
-      aMaxTotalProgress);
-  },
-
-  // This function fires only for the currently selected tab.
-  onStateChange(aWebProgress, aRequest, aStateFlags, aStatus) {
-    const nsIWebProgressListener = Ci.nsIWebProgressListener;
-    const nsIChannel = Ci.nsIChannel;
-
-    let browser = gBrowser.selectedBrowser;
-
-    if (aStateFlags & nsIWebProgressListener.STATE_START &&
-        aStateFlags & nsIWebProgressListener.STATE_IS_NETWORK) {
-
-      if (aRequest && aWebProgress.isTopLevel) {
-        // clear out feed data
-        browser.feeds = null;
-
-        // clear out search-engine data
-        browser.engines = null;
-      }
-
-      this.isBusy = true;
-
-      if (!(aStateFlags & nsIWebProgressListener.STATE_RESTORING)) {
-        this.busyUI = true;
-
-        // XXX: This needs to be based on window activity...
-        this.stopCommand.removeAttribute("disabled");
-        CombinedStopReload.switchToStop(aRequest, aWebProgress);
-      }
-    } else if (aStateFlags & nsIWebProgressListener.STATE_STOP) {
-      // This (thanks to the filter) is a network stop or the last
-      // request stop outside of loading the document, stop throbbers
-      // and progress bars and such
-      if (aRequest) {
-        let msg = "";
-        let location;
-        let canViewSource = true;
-        // Get the URI either from a channel or a pseudo-object
-        if (aRequest instanceof nsIChannel || "URI" in aRequest) {
-          location = aRequest.URI;
-
-          // For keyword URIs clear the user typed value since they will be changed into real URIs
-          if (location.scheme == "keyword" && aWebProgress.isTopLevel)
-            gBrowser.userTypedValue = null;
-
-          canViewSource = location.scheme != "view-source";
-
-          if (location.spec != "about:blank") {
-            switch (aStatus) {
-              case Cr.NS_ERROR_NET_TIMEOUT:
-                msg = gNavigatorBundle.getString("nv_timeout");
-                break;
-            }
-          }
-        }
-
-        this.status = "";
-        this.setDefaultStatus(msg);
-
-        // Disable menu entries for images, enable otherwise
-        if (browser.documentContentType && BrowserUtils.mimeTypeIsTextBased(browser.documentContentType)) {
-          this.isImage.removeAttribute("disabled");
-        } else {
-          canViewSource = false;
-          this.isImage.setAttribute("disabled", "true");
-        }
-
-        if (canViewSource) {
-          this.canViewSource.removeAttribute("disabled");
-        } else {
-          this.canViewSource.setAttribute("disabled", "true");
-        }
-      }
-
-      this.isBusy = false;
-
-      if (this.busyUI) {
-        this.busyUI = false;
-
-        this.stopCommand.setAttribute("disabled", "true");
-        CombinedStopReload.switchToReload(aRequest, aWebProgress);
-      }
-    }
-  },
-
-  onLocationChange(aWebProgress, aRequest, aLocationURI, aFlags) {
-    var location = aLocationURI ? aLocationURI.spec : "";
-
-    let pageTooltip = document.getElementById("aHTMLTooltip");
-    let tooltipNode = pageTooltip.triggerNode;
-    if (tooltipNode) {
-      // Optimise for the common case
-      if (aWebProgress.isTopLevel) {
-        pageTooltip.hidePopup();
-      } else {
-        for (let tooltipWindow = tooltipNode.ownerGlobal;
-             tooltipWindow != tooltipWindow.parent;
-             tooltipWindow = tooltipWindow.parent) {
-          if (tooltipWindow == aWebProgress.DOMWindow) {
-            pageTooltip.hidePopup();
-            break;
-          }
-        }
-      }
-    }
-
-    let browser = gBrowser.selectedBrowser;
-
-    // Disable menu entries for images, enable otherwise
-    if (browser.documentContentType && BrowserUtils.mimeTypeIsTextBased(browser.documentContentType))
-      this.isImage.removeAttribute("disabled");
-    else
-      this.isImage.setAttribute("disabled", "true");
-
-    this.hideOverLinkImmediately = true;
-    this.setOverLink("", null);
-    this.hideOverLinkImmediately = false;
-
-    // We should probably not do this if the value has changed since the user
-    // searched
-    // Update urlbar only if a new page was loaded on the primary content area
-    // Do not update urlbar if there was a subframe navigation
-
-    if (aWebProgress.isTopLevel) {
-      if ((location == "about:blank" && checkEmptyPageOrigin()) ||
-          location == "") { // Second condition is for new tabs, otherwise
-                             // reload function is enabled until tab is refreshed.
-        this.reloadCommand.setAttribute("disabled", "true");
-      } else {
-        this.reloadCommand.removeAttribute("disabled");
-      }
-
-      URLBarSetURI(aLocationURI);
-
-      BookmarkingUI.onLocationChange();
-
-      gIdentityHandler.onLocationChange();
-
-      BrowserPageActions.onLocationChange();
-
-      SafeBrowsingNotificationBox.onLocationChange(aLocationURI);
-
-      gTabletModePageCounter.inc();
-
-      // Utility functions for disabling find
-      var shouldDisableFind = function(aDocument) {
-        let docElt = aDocument.documentElement;
-        return docElt && docElt.getAttribute("disablefastfind") == "true";
-      };
-
-      var disableFindCommands = function(aDisable) {
-        let findCommands = [document.getElementById("cmd_find"),
-                            document.getElementById("cmd_findAgain"),
-                            document.getElementById("cmd_findPrevious")];
-        for (let elt of findCommands) {
-          if (aDisable)
-            elt.setAttribute("disabled", "true");
-          else
-            elt.removeAttribute("disabled");
-        }
-      };
-
-      var onContentRSChange = function(e) {
-        if (e.target.readyState != "interactive" && e.target.readyState != "complete")
-          return;
-
-        e.target.removeEventListener("readystatechange", onContentRSChange);
-        disableFindCommands(shouldDisableFind(e.target));
-      };
-
-      // Disable find commands in documents that ask for them to be disabled.
-      if (!gMultiProcessBrowser && aLocationURI &&
-          (aLocationURI.schemeIs("about") || aLocationURI.schemeIs("chrome"))) {
-        // Don't need to re-enable/disable find commands for same-document location changes
-        // (e.g. the replaceStates in about:addons)
-        if (!(aFlags & Ci.nsIWebProgressListener.LOCATION_CHANGE_SAME_DOCUMENT)) {
-          if (window.content.document.readyState == "interactive" || window.content.document.readyState == "complete")
-            disableFindCommands(shouldDisableFind(window.content.document));
-          else {
-            window.content.document.addEventListener("readystatechange", onContentRSChange);
-          }
-        }
-      } else
-        disableFindCommands(false);
-
-      // Try not to instantiate gCustomizeMode as much as possible,
-      // so don't use CustomizeMode.jsm to check for URI or customizing.
-      if (location == "about:blank" &&
-          gBrowser.selectedTab.hasAttribute("customizemode")) {
-        gCustomizeMode.enter();
-      } else if (CustomizationHandler.isEnteringCustomizeMode ||
-                 CustomizationHandler.isCustomizing()) {
-        gCustomizeMode.exit();
-      }
-    }
-    UpdateBackForwardCommands(gBrowser.webNavigation);
-    ReaderParent.updateReaderButton(gBrowser.selectedBrowser);
-
-    if (!gMultiProcessBrowser) // Bug 1108553 - Cannot rotate images with e10s
-      gGestureSupport.restoreRotationState();
-
-    // See bug 358202, when tabs are switched during a drag operation,
-    // timers don't fire on windows (bug 203573)
-    if (aRequest)
-      setTimeout(function() { XULBrowserWindow.asyncUpdateUI(); }, 0);
-    else
-      this.asyncUpdateUI();
-
-    if (AppConstants.MOZ_CRASHREPORTER && aLocationURI) {
-      let uri = aLocationURI;
-      try {
-        // If the current URI contains a username/password, remove it.
-        uri = aLocationURI.mutate()
-                          .setUserPass("")
-                          .finalize();
-      } catch (ex) { /* Ignore failures on about: URIs. */ }
-
-      try {
-        gCrashReporter.annotateCrashReport("URL", uri.spec);
-      } catch (ex) {
-        // Don't make noise when the crash reporter is built but not enabled.
-        if (ex.result != Cr.NS_ERROR_NOT_INITIALIZED) {
-          throw ex;
-        }
-      }
-    }
-  },
-
-  asyncUpdateUI() {
-    FeedHandler.updateFeeds();
-    BrowserSearch.updateOpenSearchBadge();
-  },
-
-  onStatusChange(aWebProgress, aRequest, aStatus, aMessage) {
-    this.status = aMessage;
-    StatusPanel.update();
-  },
-
-  // Properties used to cache security state used to update the UI
-  _state: null,
-  _lastLocation: null,
-
-  // This is called in multiple ways:
-  //  1. Due to the nsIWebProgressListener.onSecurityChange notification.
-  //  2. Called by tabbrowser.xml when updating the current browser.
-  //  3. Called directly during this object's initializations.
-  // aRequest will be null always in case 2 and 3, and sometimes in case 1 (for
-  // instance, there won't be a request when STATE_BLOCKED_TRACKING_CONTENT is observed).
-  onSecurityChange(aWebProgress, aRequest, aState, aIsSimulated) {
-    // Don't need to do anything if the data we use to update the UI hasn't
-    // changed
-    let uri = gBrowser.currentURI;
-    let spec = uri.spec;
-    if (this._state == aState &&
-        this._lastLocation == spec) {
-      // Switching to a tab of the same URL doesn't change most security
-      // information, but tab specific permissions may be different.
-      gIdentityHandler.refreshIdentityBlock();
-      return;
-    }
-    this._state = aState;
-    this._lastLocation = spec;
-
-    if (typeof(aIsSimulated) != "boolean" && typeof(aIsSimulated) != "undefined") {
-      throw "onSecurityChange: aIsSimulated receieved an unexpected type";
-    }
-
-    // Make sure the "https" part of the URL is striked out or not,
-    // depending on the current mixed active content blocking state.
-    gURLBar.formatValue();
-
-    try {
-      uri = Services.uriFixup.createExposableURI(uri);
-    } catch (e) {}
-    gIdentityHandler.updateIdentity(this._state, uri);
-    TrackingProtection.onSecurityChange(this._state, aIsSimulated);
-  },
-
-  // simulate all change notifications after switching tabs
-  onUpdateCurrentBrowser: function XWB_onUpdateCurrentBrowser(aStateFlags, aStatus, aMessage, aTotalProgress) {
-    if (FullZoom.updateBackgroundTabs)
-      FullZoom.onLocationChange(gBrowser.currentURI, true);
-
-    CombinedStopReload.onTabSwitch();
-
-    var nsIWebProgressListener = Ci.nsIWebProgressListener;
-    var loadingDone = aStateFlags & nsIWebProgressListener.STATE_STOP;
-    // use a pseudo-object instead of a (potentially nonexistent) channel for getting
-    // a correct error message - and make sure that the UI is always either in
-    // loading (STATE_START) or done (STATE_STOP) mode
-    this.onStateChange(
-      gBrowser.webProgress,
-      { URI: gBrowser.currentURI },
-      loadingDone ? nsIWebProgressListener.STATE_STOP : nsIWebProgressListener.STATE_START,
-      aStatus
-    );
-    // status message and progress value are undefined if we're done with loading
-    if (loadingDone)
-      return;
-    this.onStatusChange(gBrowser.webProgress, null, 0, aMessage);
-  },
-
-  navigateAndRestoreByIndex: function XWB_navigateAndRestoreByIndex(aBrowser, aIndex) {
-    let tab = gBrowser.getTabForBrowser(aBrowser);
-    if (tab) {
-      SessionStore.navigateAndRestore(tab, {}, aIndex);
-      return;
-    }
-
-    throw new Error("Trying to navigateAndRestore a browser which was " +
-                    "not attached to this tabbrowser is unsupported");
-  }
-};
-
-var LinkTargetDisplay = {
-  get DELAY_SHOW() {
-     delete this.DELAY_SHOW;
-     return this.DELAY_SHOW = Services.prefs.getIntPref("browser.overlink-delay");
-  },
-
-  DELAY_HIDE: 250,
-  _timer: 0,
-
-  update() {
-    clearTimeout(this._timer);
-    window.removeEventListener("mousemove", this, true);
-
-    if (!XULBrowserWindow.overLink) {
-      if (XULBrowserWindow.hideOverLinkImmediately)
-        this._hide();
-      else
-        this._timer = setTimeout(this._hide.bind(this), this.DELAY_HIDE);
-      return;
-    }
-
-    if (StatusPanel.isVisible) {
-      StatusPanel.update();
-    } else {
-      // Let the display appear when the mouse doesn't move within the delay
-      this._showDelayed();
-      window.addEventListener("mousemove", this, true);
-    }
-  },
-
-  handleEvent(event) {
-    switch (event.type) {
-      case "mousemove":
-        // Restart the delay since the mouse was moved
-        clearTimeout(this._timer);
-        this._showDelayed();
-        break;
-    }
-  },
-
-  _showDelayed() {
-    this._timer = setTimeout(function(self) {
-      StatusPanel.update();
-      window.removeEventListener("mousemove", self, true);
-    }, this.DELAY_SHOW, this);
-  },
-
-  _hide() {
-    clearTimeout(this._timer);
-
-    StatusPanel.update();
-  }
-};
-
-var CombinedStopReload = {
-  // Try to initialize. Returns whether initialization was successful, which
-  // may mean we had already initialized.
-  ensureInitialized() {
-    if (this._initialized)
-      return true;
-    if (this._destroyed)
-      return false;
-
-    let reload = document.getElementById("reload-button");
-    let stop = document.getElementById("stop-button");
-    // It's possible the stop/reload buttons have been moved to the palette.
-    // They may be reinserted later, so we will retry initialization if/when
-    // we get notified of document loads.
-    if (!stop || !reload)
-      return false;
-
-    this._initialized = true;
-    if (XULBrowserWindow.stopCommand.getAttribute("disabled") != "true")
-      reload.setAttribute("displaystop", "true");
-    stop.addEventListener("click", this);
-
-    // Removing attributes based on the observed command doesn't happen if the button
-    // is in the palette when the command's attribute is removed (cf. bug 309953)
-    for (let button of [stop, reload]) {
-      if (button.hasAttribute("disabled")) {
-        let command = document.getElementById(button.getAttribute("command"));
-        if (!command.hasAttribute("disabled")) {
-          button.removeAttribute("disabled");
-        }
-      }
-    }
-
-    this.reload = reload;
-    this.stop = stop;
-    this.stopReloadContainer = this.reload.parentNode;
-    this.timeWhenSwitchedToStop = 0;
-
-    if (this._shouldStartPrefMonitoring) {
-      this.startAnimationPrefMonitoring();
-    }
-    return true;
-  },
-
-  uninit() {
-    this._destroyed = true;
-
-    if (!this._initialized)
-      return;
-
-    Services.prefs.removeObserver("toolkit.cosmeticAnimations.enabled", this);
-    this._cancelTransition();
-    this.stop.removeEventListener("click", this);
-    this.stopReloadContainer.removeEventListener("animationend", this);
-    this.stopReloadContainer = null;
-    this.reload = null;
-    this.stop = null;
-  },
-
-  handleEvent(event) {
-    switch (event.type) {
-      case "click":
-        if (event.button == 0 &&
-            !this.stop.disabled) {
-          this._stopClicked = true;
-        }
-      case "animationend": {
-        if (event.target.classList.contains("toolbarbutton-animatable-image") &&
-            (event.animationName == "reload-to-stop" ||
-             event.animationName == "stop-to-reload" ||
-             event.animationName == "reload-to-stop-rtl" ||
-             event.animationName == "stop-to-reload-rtl")) {
-          this.stopReloadContainer.removeAttribute("animate");
-        }
-      }
-    }
-  },
-
-  observe(subject, topic, data) {
-    if (topic == "nsPref:changed") {
-      this.animate = Services.prefs.getBoolPref("toolkit.cosmeticAnimations.enabled");
-    }
-  },
-
-  startAnimationPrefMonitoring() {
-    // CombinedStopReload may have been uninitialized before the idleCallback is executed.
-    if (this._destroyed)
-      return;
-    if (!this.ensureInitialized()) {
-      this._shouldStartPrefMonitoring = true;
-      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() {
-    // Reset the time in the event of a tabswitch since the stored time
-    // would have been associated with the previous tab, so the animation will
-    // still run if the page has been loading until long after the tab switch.
-    this.timeWhenSwitchedToStop = window.performance.now();
-  },
-
-  switchToStop(aRequest, aWebProgress) {
-    if (!this.ensureInitialized() || !this._shouldSwitch(aRequest, aWebProgress)) {
-      return;
-    }
-
-    // Store the time that we switched to the stop button only if a request
-    // is active. Requests are null if the switch is related to a tabswitch.
-    // This is used to determine if we should show the stop->reload animation.
-    if (aRequest instanceof Ci.nsIRequest) {
-      this.timeWhenSwitchedToStop = window.performance.now();
-    }
-
-    let shouldAnimate = aRequest instanceof Ci.nsIRequest &&
-                        aWebProgress.isTopLevel &&
-                        aWebProgress.isLoadingDocument &&
-                        !gBrowser.tabAnimationsInProgress &&
-                        this.stopReloadContainer.closest("#nav-bar-customization-target") &&
-                        this.animate;
-
-    this._cancelTransition();
-    if (shouldAnimate) {
-      BrowserUtils.setToolbarButtonHeightProperty(this.stopReloadContainer);
-      this.stopReloadContainer.setAttribute("animate", "true");
-    } else {
-      this.stopReloadContainer.removeAttribute("animate");
-    }
-    this.reload.setAttribute("displaystop", "true");
-  },
-
-  switchToReload(aRequest, aWebProgress) {
-    if (!this.ensureInitialized() || !this.reload.hasAttribute("displaystop")) {
-      return;
-    }
-
-    let shouldAnimate = aRequest instanceof Ci.nsIRequest &&
-                        aWebProgress.isTopLevel &&
-                        !aWebProgress.isLoadingDocument &&
-                        !gBrowser.tabAnimationsInProgress &&
-                        this._loadTimeExceedsMinimumForAnimation() &&
-                        this.stopReloadContainer.closest("#nav-bar-customization-target") &&
-                        this.animate;
-
-    if (shouldAnimate) {
-      BrowserUtils.setToolbarButtonHeightProperty(this.stopReloadContainer);
-      this.stopReloadContainer.setAttribute("animate", "true");
-    } else {
-      this.stopReloadContainer.removeAttribute("animate");
-    }
-
-    this.reload.removeAttribute("displaystop");
-
-    if (!shouldAnimate || this._stopClicked) {
-      this._stopClicked = false;
-      this._cancelTransition();
-      this.reload.disabled = XULBrowserWindow.reloadCommand
-                                             .getAttribute("disabled") == "true";
-      return;
-    }
-
-    if (this._timer)
-      return;
-
-    // Temporarily disable the reload button to prevent the user from
-    // accidentally reloading the page when intending to click the stop button
-    this.reload.disabled = true;
-    this._timer = setTimeout(function(self) {
-      self._timer = 0;
-      self.reload.disabled = XULBrowserWindow.reloadCommand
-                                             .getAttribute("disabled") == "true";
-    }, 650, this);
-  },
-
-  _loadTimeExceedsMinimumForAnimation() {
-    // If the time between switching to the stop button then switching to
-    // the reload button exceeds 150ms, then we will show the animation.
-    // If we don't know when we switched to stop (switchToStop is called
-    // after init but before switchToReload), then we will prevent the
-    // animation from occuring.
-    return this.timeWhenSwitchedToStop &&
-           window.performance.now() - this.timeWhenSwitchedToStop > 150;
-  },
-
-  _shouldSwitch(aRequest, aWebProgress) {
-    if (aRequest &&
-        aRequest.originalURI &&
-        (aRequest.originalURI.schemeIs("chrome") ||
-         (aRequest.originalURI.schemeIs("about") &&
-          aWebProgress.isTopLevel &&
-          !aRequest.originalURI.spec.startsWith("about:reader")))) {
-      return false;
-    }
-
-    return true;
-  },
-
-  _cancelTransition() {
-    if (this._timer) {
-      clearTimeout(this._timer);
-      this._timer = 0;
-    }
-  }
-};
-
-var TabsProgressListener = {
-  onStateChange(aBrowser, aWebProgress, aRequest, aStateFlags, aStatus) {
-    // Collect telemetry data about tab load times.
-    if (aWebProgress.isTopLevel && (!aRequest.originalURI || aRequest.originalURI.spec.scheme != "about")) {
-      let stopwatchRunning = TelemetryStopwatch.running("FX_PAGE_LOAD_MS", aBrowser);
-
-      if (aStateFlags & Ci.nsIWebProgressListener.STATE_IS_WINDOW) {
-        if (aStateFlags & Ci.nsIWebProgressListener.STATE_START) {
-          if (stopwatchRunning) {
-            // Oops, we're seeing another start without having noticed the previous stop.
-            TelemetryStopwatch.cancel("FX_PAGE_LOAD_MS", aBrowser);
-          }
-          TelemetryStopwatch.start("FX_PAGE_LOAD_MS", aBrowser);
-          Services.telemetry.getHistogramById("FX_TOTAL_TOP_VISITS").add(true);
-        } else if (aStateFlags & Ci.nsIWebProgressListener.STATE_STOP &&
-                   stopwatchRunning /* we won't see STATE_START events for pre-rendered tabs */) {
-          TelemetryStopwatch.finish("FX_PAGE_LOAD_MS", aBrowser);
-        }
-      } else if (aStateFlags & Ci.nsIWebProgressListener.STATE_STOP &&
-                 aStatus == Cr.NS_BINDING_ABORTED &&
-                 stopwatchRunning /* we won't see STATE_START events for pre-rendered tabs */) {
-        TelemetryStopwatch.cancel("FX_PAGE_LOAD_MS", aBrowser);
-      }
-    }
-
-    // We used to listen for clicks in the browser here, but when that
-    // became unnecessary, removing the code below caused focus issues.
-    // This code should be removed. Tracked in bug 1337794.
-    let isRemoteBrowser = aBrowser.isRemoteBrowser;
-    // We check isRemoteBrowser here to avoid requesting the doc CPOW
-    let doc = isRemoteBrowser ? null : aWebProgress.DOMWindow.document;
-
-    if (!isRemoteBrowser &&
-        aStateFlags & Ci.nsIWebProgressListener.STATE_STOP &&
-        Components.isSuccessCode(aStatus) &&
-        doc.documentURI.startsWith("about:") &&
-        !doc.documentURI.toLowerCase().startsWith("about:blank") &&
-        !doc.documentURI.toLowerCase().startsWith("about:home") &&
-        !doc.documentElement.hasAttribute("hasBrowserHandlers")) {
-      // STATE_STOP may be received twice for documents, thus store an
-      // attribute to ensure handling it just once.
-      doc.documentElement.setAttribute("hasBrowserHandlers", "true");
-      aBrowser.addEventListener("pagehide", function onPageHide(event) {
-        if (event.target.defaultView.frameElement)
-          return;
-        aBrowser.removeEventListener("pagehide", onPageHide, true);
-        if (event.target.documentElement)
-          event.target.documentElement.removeAttribute("hasBrowserHandlers");
-      }, true);
-    }
-  },
-
-  onLocationChange(aBrowser, aWebProgress, aRequest, aLocationURI, aFlags) {
-    // Filter out location changes caused by anchor navigation
-    // or history.push/pop/replaceState.
-    if (aFlags & Ci.nsIWebProgressListener.LOCATION_CHANGE_SAME_DOCUMENT) {
-      // Reader mode cares about history.pushState and friends.
-      // FIXME: The content process should manage this directly (bug 1445351).
-      aBrowser.messageManager.sendAsyncMessage("Reader:PushState", {
-        isArticle: aBrowser.isArticle,
-      });
-      return;
-    }
-
-    // Filter out location changes in sub documents.
-    if (!aWebProgress.isTopLevel)
-      return;
-
-    // Only need to call locationChange if the PopupNotifications object
-    // for this window has already been initialized (i.e. its getter no
-    // longer exists)
-    if (!Object.getOwnPropertyDescriptor(window, "PopupNotifications").get)
-      PopupNotifications.locationChange(aBrowser);
-
-    let tab = gBrowser.getTabForBrowser(aBrowser);
-    if (tab && tab._sharingState) {
-      gBrowser.setBrowserSharing(aBrowser, {});
-    }
-    webrtcUI.forgetStreamsFromBrowser(aBrowser);
-
-    gBrowser.getNotificationBox(aBrowser).removeTransientNotifications();
-
-    FullZoom.onLocationChange(aLocationURI, false, aBrowser);
-  },
-};
-
-function nsBrowserAccess() { }
-
-nsBrowserAccess.prototype = {
-  QueryInterface: XPCOMUtils.generateQI([Ci.nsIBrowserDOMWindow, Ci.nsISupports]),
-
-  _openURIInNewTab(aURI, aReferrer, aReferrerPolicy, aIsPrivate,
-                   aIsExternal, aForceNotRemote = false,
-                   aUserContextId = Ci.nsIScriptSecurityManager.DEFAULT_USER_CONTEXT_ID,
-                   aOpenerWindow = null, aOpenerBrowser = null,
-                   aTriggeringPrincipal = null, aNextTabParentId = 0, aName = "") {
-    let win, needToFocusWin;
-
-    // try the current window.  if we're in a popup, fall back on the most recent browser window
-    if (window.toolbar.visible)
-      win = window;
-    else {
-      win = RecentWindow.getMostRecentBrowserWindow({private: aIsPrivate});
-      needToFocusWin = true;
-    }
-
-    if (!win) {
-      // we couldn't find a suitable window, a new one needs to be opened.
-      return null;
-    }
-
-    if (aIsExternal && (!aURI || aURI.spec == "about:blank")) {
-      win.BrowserOpenTab(); // this also focuses the location bar
-      win.focus();
-      return win.gBrowser.selectedBrowser;
-    }
-
-    let loadInBackground = Services.prefs.getBoolPref("browser.tabs.loadDivertedInBackground");
-
-    let tab = win.gBrowser.loadOneTab(aURI ? aURI.spec : "about:blank", {
-                                      triggeringPrincipal: aTriggeringPrincipal,
-                                      referrerURI: aReferrer,
-                                      referrerPolicy: aReferrerPolicy,
-                                      userContextId: aUserContextId,
-                                      fromExternal: aIsExternal,
-                                      inBackground: loadInBackground,
-                                      forceNotRemote: aForceNotRemote,
-                                      opener: aOpenerWindow,
-                                      openerBrowser: aOpenerBrowser,
-                                      nextTabParentId: aNextTabParentId,
-                                      name: aName,
-                                      });
-    let browser = win.gBrowser.getBrowserForTab(tab);
-
-    if (needToFocusWin || (!loadInBackground && aIsExternal))
-      win.focus();
-
-    return browser;
-  },
-
-  createContentWindow(aURI, aOpener, aWhere, aFlags, aTriggeringPrincipal) {
-    return this.getContentWindowOrOpenURI(null, aOpener, aWhere, aFlags,
-                                          aTriggeringPrincipal);
-  },
-
-  openURI(aURI, aOpener, aWhere, aFlags, aTriggeringPrincipal) {
-    if (!aURI) {
-      Cu.reportError("openURI should only be called with a valid URI");
-      throw Cr.NS_ERROR_FAILURE;
-    }
-    return this.getContentWindowOrOpenURI(aURI, aOpener, aWhere, aFlags,
-                                          aTriggeringPrincipal);
-  },
-
-  getContentWindowOrOpenURI(aURI, aOpener, aWhere, aFlags, aTriggeringPrincipal) {
-    // This function should only ever be called if we're opening a URI
-    // from a non-remote browser window (via nsContentTreeOwner).
-    if (aOpener && Cu.isCrossProcessWrapper(aOpener)) {
-      Cu.reportError("nsBrowserAccess.openURI was passed a CPOW for aOpener. " +
-                     "openURI should only ever be called from non-remote browsers.");
-      throw Cr.NS_ERROR_FAILURE;
-    }
-
-    var newWindow = null;
-    var isExternal = !!(aFlags & Ci.nsIBrowserDOMWindow.OPEN_EXTERNAL);
-
-    if (aOpener && isExternal) {
-      Cu.reportError("nsBrowserAccess.openURI did not expect an opener to be " +
-                     "passed if the context is OPEN_EXTERNAL.");
-      throw Cr.NS_ERROR_FAILURE;
-    }
-
-    if (isExternal && aURI && aURI.schemeIs("chrome")) {
-      dump("use --chrome command-line option to load external chrome urls\n");
-      return null;
-    }
-
-    if (aWhere == Ci.nsIBrowserDOMWindow.OPEN_DEFAULTWINDOW) {
-      if (isExternal &&
-          Services.prefs.prefHasUserValue("browser.link.open_newwindow.override.external"))
-        aWhere = Services.prefs.getIntPref("browser.link.open_newwindow.override.external");
-      else
-        aWhere = Services.prefs.getIntPref("browser.link.open_newwindow");
-    }
-
-    let referrer = aOpener ? makeURI(aOpener.location.href) : null;
-    let referrerPolicy = Ci.nsIHttpChannel.REFERRER_POLICY_UNSET;
-    if (aOpener && aOpener.document) {
-      referrerPolicy = aOpener.document.referrerPolicy;
-    }
-    let isPrivate = aOpener
-                  ? PrivateBrowsingUtils.isContentWindowPrivate(aOpener)
-                  : PrivateBrowsingUtils.isWindowPrivate(window);
-
-    switch (aWhere) {
-      case Ci.nsIBrowserDOMWindow.OPEN_NEWWINDOW :
-        // FIXME: Bug 408379. So how come this doesn't send the
-        // referrer like the other loads do?
-        var url = aURI ? aURI.spec : "about:blank";
-        let features = "all,dialog=no";
-        if (isPrivate) {
-          features += ",private";
-        }
-        // Pass all params to openDialog to ensure that "url" isn't passed through
-        // loadOneOrMoreURIs, which splits based on "|"
-        newWindow = openDialog(getBrowserURL(), "_blank", features, url, null, null, null);
-        break;
-      case Ci.nsIBrowserDOMWindow.OPEN_NEWTAB :
-        // If we have an opener, that means that the caller is expecting access
-        // to the nsIDOMWindow of the opened tab right away. For e10s windows,
-        // this means forcing the newly opened browser to be non-remote so that
-        // we can hand back the nsIDOMWindow. The XULBrowserWindow.shouldLoadURI
-        // will do the job of shuttling off the newly opened browser to run in
-        // the right process once it starts loading a URI.
-        let forceNotRemote = !!aOpener;
-        let userContextId = aOpener && aOpener.document
-                              ? aOpener.document.nodePrincipal.originAttributes.userContextId
-                              : Ci.nsIScriptSecurityManager.DEFAULT_USER_CONTEXT_ID;
-        let openerWindow = (aFlags & Ci.nsIBrowserDOMWindow.OPEN_NO_OPENER) ? null : aOpener;
-        let browser = this._openURIInNewTab(aURI, referrer, referrerPolicy,
-                                            isPrivate, isExternal,
-                                            forceNotRemote, userContextId,
-                                            openerWindow, null, aTriggeringPrincipal);
-        if (browser)
-          newWindow = browser.contentWindow;
-        break;
-      default : // OPEN_CURRENTWINDOW or an illegal value
-        newWindow = window.content;
-        if (aURI) {
-          let loadflags = isExternal ?
-                            Ci.nsIWebNavigation.LOAD_FLAGS_FROM_EXTERNAL :
-                            Ci.nsIWebNavigation.LOAD_FLAGS_NONE;
-          gBrowser.loadURI(aURI.spec, {
-            triggeringPrincipal: aTriggeringPrincipal,
-            flags: loadflags,
-            referrerURI: referrer,
-            referrerPolicy,
-          });
-        }
-        if (!Services.prefs.getBoolPref("browser.tabs.loadDivertedInBackground"))
-          window.focus();
-    }
-    return newWindow;
-  },
-
-  createContentWindowInFrame: function browser_createContentWindowInFrame(
-                              aURI, aParams, aWhere, aFlags, aNextTabParentId,
-                              aName) {
-    // Passing a null-URI to only create the content window.
-    return this.getContentWindowOrOpenURIInFrame(null, aParams, aWhere, aFlags,
-                                                 aNextTabParentId, aName);
-  },
-
-  openURIInFrame: function browser_openURIInFrame(aURI, aParams, aWhere, aFlags,
-                                                  aNextTabParentId, aName) {
-    return this.getContentWindowOrOpenURIInFrame(aURI, aParams, aWhere, aFlags,
-                                                 aNextTabParentId, aName);
-  },
-
-  getContentWindowOrOpenURIInFrame: function browser_getContentWindowOrOpenURIInFrame(
-                                    aURI, aParams, aWhere, aFlags,
-                                    aNextTabParentId, aName) {
-    if (aWhere != Ci.nsIBrowserDOMWindow.OPEN_NEWTAB) {
-      dump("Error: openURIInFrame can only open in new tabs");
-      return null;
-    }
-
-    var isExternal = !!(aFlags & Ci.nsIBrowserDOMWindow.OPEN_EXTERNAL);
-
-    var userContextId = aParams.openerOriginAttributes &&
-                        ("userContextId" in aParams.openerOriginAttributes)
-                          ? aParams.openerOriginAttributes.userContextId
-                          : Ci.nsIScriptSecurityManager.DEFAULT_USER_CONTEXT_ID;
-
-    let referrer = aParams.referrer ? makeURI(aParams.referrer) : null;
-    return this._openURIInNewTab(aURI, referrer,
-                                 aParams.referrerPolicy,
-                                 aParams.isPrivate,
-                                 isExternal, false,
-                                 userContextId, null, aParams.openerBrowser,
-                                 aParams.triggeringPrincipal,
-                                 aNextTabParentId, aName);
-  },
-
-  isTabContentWindow(aWindow) {
-    return gBrowser.browsers.some(browser => browser.contentWindow == aWindow);
-  },
-
-  canClose() {
-    return CanCloseWindow();
-  },
-};
-
-function onViewToolbarsPopupShowing(aEvent, aInsertPoint) {
-  var popup = aEvent.target;
-  if (popup != aEvent.currentTarget)
-    return;
-
-  // Empty the menu
-  for (var i = popup.childNodes.length - 1; i >= 0; --i) {
-    var deadItem = popup.childNodes[i];
-    if (deadItem.hasAttribute("toolbarId"))
-      popup.removeChild(deadItem);
-  }
-
-  var firstMenuItem = aInsertPoint || popup.firstChild;
-
-  let toolbarNodes = gNavToolbox.childNodes;
-
-  for (let toolbar of toolbarNodes) {
-    if (!toolbar.hasAttribute("toolbarname")) {
-      continue;
-    }
-
-    let menuItem = document.createElement("menuitem");
-    let hidingAttribute = toolbar.getAttribute("type") == "menubar" ?
-                          "autohide" : "collapsed";
-    menuItem.setAttribute("id", "toggle_" + toolbar.id);
-    menuItem.setAttribute("toolbarId", toolbar.id);
-    menuItem.setAttribute("type", "checkbox");
-    menuItem.setAttribute("label", toolbar.getAttribute("toolbarname"));
-    menuItem.setAttribute("checked", toolbar.getAttribute(hidingAttribute) != "true");
-    menuItem.setAttribute("accesskey", toolbar.getAttribute("accesskey"));
-    if (popup.id != "toolbar-context-menu")
-      menuItem.setAttribute("key", toolbar.getAttribute("key"));
-
-    popup.insertBefore(menuItem, firstMenuItem);
-
-    menuItem.addEventListener("command", onViewToolbarCommand);
-  }
-
-
-  let moveToPanel = popup.querySelector(".customize-context-moveToPanel");
-  let removeFromToolbar = popup.querySelector(".customize-context-removeFromToolbar");
-  // View -> Toolbars menu doesn't have the moveToPanel or removeFromToolbar items.
-  if (!moveToPanel || !removeFromToolbar) {
-    return;
-  }
-
-  // triggerNode can be a nested child element of a toolbaritem.
-  let toolbarItem = popup.triggerNode;
-
-  if (toolbarItem && toolbarItem.localName == "toolbarpaletteitem") {
-    toolbarItem = toolbarItem.firstChild;
-  } else if (toolbarItem && toolbarItem.localName != "toolbar") {
-    while (toolbarItem && toolbarItem.parentNode) {
-      let parent = toolbarItem.parentNode;
-      if (parent.nodeType !== Node.ELEMENT_NODE ||
-          (parent.classList && parent.classList.contains("customization-target")) ||
-          parent.getAttribute("overflowfortoolbar") || // Needs to work in the overflow list as well.
-          parent.localName == "toolbarpaletteitem" ||
-          parent.localName == "toolbar")
-        break;
-      toolbarItem = parent;
-    }
-  } else {
-    toolbarItem = null;
-  }
-
-  let showTabStripItems = toolbarItem && toolbarItem.id == "tabbrowser-tabs";
-  for (let node of popup.querySelectorAll('menuitem[contexttype="toolbaritem"]')) {
-    node.hidden = showTabStripItems;
-  }
-
-  for (let node of popup.querySelectorAll('menuitem[contexttype="tabbar"]')) {
-    node.hidden = !showTabStripItems;
-  }
-
-  if (showTabStripItems) {
-    PlacesCommandHook.updateBookmarkAllTabsCommand();
-
-    let haveMultipleTabs = gBrowser.visibleTabs.length > 1;
-    document.getElementById("toolbar-context-reloadAllTabs").disabled = !haveMultipleTabs;
-
-    document.getElementById("toolbar-context-undoCloseTab").disabled =
-      SessionStore.getClosedTabCount(window) == 0;
-    return;
-  }
-
-  // In some cases, we will exit the above loop with toolbarItem being the
-  // xul:document. That has no parentNode, and we should disable the items in
-  // this case.
-  let movable = toolbarItem && toolbarItem.parentNode &&
-                CustomizableUI.isWidgetRemovable(toolbarItem);
-  let isSpecial = toolbarItem && CustomizableUI.isSpecialWidget(toolbarItem.id);
-  if (movable) {
-    if (isSpecial) {
-      moveToPanel.setAttribute("disabled", true);
-    } else {
-      moveToPanel.removeAttribute("disabled");
-    }
-    removeFromToolbar.removeAttribute("disabled");
-  } else {
-    moveToPanel.setAttribute("disabled", true);
-    removeFromToolbar.setAttribute("disabled", true);
-  }
-}
-
-function onViewToolbarCommand(aEvent) {
-  let node = aEvent.originalTarget;
-  let toolbarId = node.getAttribute("toolbarId");
-  let isVisible = node.getAttribute("checked") == "true";
-  CustomizableUI.setToolbarVisibility(toolbarId, isVisible);
-  updateToggleControlLabel(node);
-}
-
-function setToolbarVisibility(toolbar, isVisible, persist = true) {
-  let hidingAttribute;
-  if (toolbar.getAttribute("type") == "menubar") {
-    hidingAttribute = "autohide";
-    if (AppConstants.platform == "linux") {
-      Services.prefs.setBoolPref("ui.key.menuAccessKeyFocuses", !isVisible);
-    }
-  } else {
-    hidingAttribute = "collapsed";
-  }
-
-  toolbar.setAttribute(hidingAttribute, !isVisible);
-  if (persist) {
-    document.persist(toolbar.id, hidingAttribute);
-  }
-
-  let eventParams = {
-    detail: {
-      visible: isVisible
-    },
-    bubbles: true
-  };
-  let event = new CustomEvent("toolbarvisibilitychange", eventParams);
-  toolbar.dispatchEvent(event);
-
-  BookmarkingUI.onToolbarVisibilityChange();
-
-  if (toolbar.getAttribute("type") == "menubar" && CustomizationHandler.isCustomizing()) {
-    gCustomizeMode._updateDragSpaceCheckbox();
-  }
-}
-
-function updateToggleControlLabel(control) {
-  if (!control.hasAttribute("label-checked")) {
-    return;
-  }
-
-  if (!control.hasAttribute("label-unchecked")) {
-    control.setAttribute("label-unchecked", control.getAttribute("label"));
-  }
-  let prefix = (control.getAttribute("checked") == "true") ? "" : "un";
-  control.setAttribute("label", control.getAttribute(`label-${prefix}checked`));
-}
-
-var TabletModeUpdater = {
-  init() {
-    if (AppConstants.isPlatformAndVersionAtLeast("win", "10")) {
-      this.update(WindowsUIUtils.inTabletMode);
-      Services.obs.addObserver(this, "tablet-mode-change");
-    }
-  },
-
-  uninit() {
-    if (AppConstants.isPlatformAndVersionAtLeast("win", "10")) {
-      Services.obs.removeObserver(this, "tablet-mode-change");
-    }
-  },
-
-  observe(subject, topic, data) {
-    this.update(data == "tablet-mode");
-  },
-
-  update(isInTabletMode) {
-    let wasInTabletMode = document.documentElement.hasAttribute("tabletmode");
-    if (isInTabletMode) {
-      document.documentElement.setAttribute("tabletmode", "true");
-    } else {
-      document.documentElement.removeAttribute("tabletmode");
-    }
-    if (wasInTabletMode != isInTabletMode) {
-      gUIDensity.update();
-    }
-  },
-};
-
-var gTabletModePageCounter = {
-  enabled: false,
-  inc() {
-    this.enabled = AppConstants.isPlatformAndVersionAtLeast("win", "10.0");
-    if (!this.enabled) {
-      this.inc = () => {};
-      return;
-    }
-    this.inc = this._realInc;
-    this.inc();
-  },
-
-  _desktopCount: 0,
-  _tabletCount: 0,
-  _realInc() {
-    let inTabletMode = document.documentElement.hasAttribute("tabletmode");
-    this[inTabletMode ? "_tabletCount" : "_desktopCount"]++;
-  },
-
-  finish() {
-    if (this.enabled) {
-      let histogram = Services.telemetry.getKeyedHistogramById("FX_TABLETMODE_PAGE_LOAD");
-      histogram.add("tablet", this._tabletCount);
-      histogram.add("desktop", this._desktopCount);
-    }
-  },
-};
-
-function displaySecurityInfo() {
-  BrowserPageInfo(null, "securityTab");
-}
-
-// Updates the UI density (for touch and compact mode) based on the uidensity pref.
-var gUIDensity = {
-  MODE_NORMAL: 0,
-  MODE_COMPACT: 1,
-  MODE_TOUCH: 2,
-  uiDensityPref: "browser.uidensity",
-  autoTouchModePref: "browser.touchmode.auto",
-
-  init() {
-    this.update();
-    Services.prefs.addObserver(this.uiDensityPref, this);
-    Services.prefs.addObserver(this.autoTouchModePref, this);
-  },
-
-  uninit() {
-    Services.prefs.removeObserver(this.uiDensityPref, this);
-    Services.prefs.removeObserver(this.autoTouchModePref, this);
-  },
-
-  observe(aSubject, aTopic, aPrefName) {
-    if (aTopic != "nsPref:changed" ||
-        (aPrefName != this.uiDensityPref &&
-         aPrefName != this.autoTouchModePref)) {
-      return;
-    }
-
-    this.update();
-  },
-
-  getCurrentDensity() {
-    // Automatically override the uidensity to touch in Windows tablet mode.
-    if (AppConstants.isPlatformAndVersionAtLeast("win", "10") &&
-        WindowsUIUtils.inTabletMode &&
-        Services.prefs.getBoolPref(this.autoTouchModePref)) {
-      return { mode: this.MODE_TOUCH, overridden: true };
-    }
-    return { mode: Services.prefs.getIntPref(this.uiDensityPref), overridden: false };
-  },
-
-  setCurrentMode(mode) {
-    Services.prefs.setIntPref(this.uiDensityPref, mode);
-  },
-
-  update(mode) {
-    if (mode == null) {
-      mode = this.getCurrentDensity().mode;
-    }
-
-    let docs = [document.documentElement];
-    let shouldUpdateSidebar = SidebarUI.initialized && SidebarUI.isOpen;
-    if (shouldUpdateSidebar) {
-      docs.push(SidebarUI.browser.contentDocument.documentElement);
-    }
-    for (let doc of docs) {
-      switch (mode) {
-      case this.MODE_COMPACT:
-        doc.setAttribute("uidensity", "compact");
-        break;
-      case this.MODE_TOUCH:
-        doc.setAttribute("uidensity", "touch");
-        break;
-      default:
-        doc.removeAttribute("uidensity");
-        break;
-      }
-    }
-    if (shouldUpdateSidebar) {
-      let tree = SidebarUI.browser.contentDocument.querySelector(".sidebar-placesTree");
-      if (tree) {
-        // Tree items don't update their styles without changing some property on the
-        // parent tree element, like background-color or border. See bug 1407399.
-        tree.style.border = "1px";
-        tree.style.border = "";
-      }
-    }
-
-    TabsInTitlebar.update();
-    gBrowser.tabContainer.uiDensityChanged();
-  },
-};
-
-var gHomeButton = {
-  prefDomain: "browser.startup.homepage",
-  observe(aSubject, aTopic, aPrefName) {
-    if (aTopic != "nsPref:changed" || aPrefName != this.prefDomain)
-      return;
-
-    this.updateTooltip();
-  },
-
-  updateTooltip(homeButton) {
-    if (!homeButton)
-      homeButton = document.getElementById("home-button");
-    if (homeButton) {
-      var homePage = this.getHomePage();
-      homePage = homePage.replace(/\|/g, ", ");
-      if (["about:home", "about:newtab"].includes(homePage.toLowerCase()))
-        homeButton.setAttribute("tooltiptext", homeButton.getAttribute("aboutHomeOverrideTooltip"));
-      else
-        homeButton.setAttribute("tooltiptext", homePage);
-    }
-  },
-
-  getHomePage() {
-    var url;
-    try {
-      url = Services.prefs.getComplexValue(this.prefDomain,
-                                  Ci.nsIPrefLocalizedString).data;
-    } catch (e) {
-    }
-
-    // use this if we can't find the pref
-    if (!url) {
-      var configBundle = Services.strings
-                                 .createBundle("chrome://branding/locale/browserconfig.properties");
-      url = configBundle.GetStringFromName(this.prefDomain);
-    }
-
-    return url;
-  },
-};
-
-const nodeToTooltipMap = {
-  "bookmarks-menu-button": "bookmarksMenuButton.tooltip",
-  "context-reload": "reloadButton.tooltip",
-  "context-stop": "stopButton.tooltip",
-  "downloads-button": "downloads.tooltip",
-  "fullscreen-button": "fullscreenButton.tooltip",
-  "appMenu-fullscreen-button": "fullscreenButton.tooltip",
-  "new-window-button": "newWindowButton.tooltip",
-  "new-tab-button": "newTabButton.tooltip",
-  "tabs-newtab-button": "newTabButton.tooltip",
-  "reload-button": "reloadButton.tooltip",
-  "stop-button": "stopButton.tooltip",
-  "urlbar-zoom-button": "urlbar-zoom-button.tooltip",
-  "appMenu-cut-button": "cut-button.tooltip",
-  "appMenu-copy-button": "copy-button.tooltip",
-  "appMenu-paste-button": "paste-button.tooltip",
-  "appMenu-zoomEnlarge-button": "zoomEnlarge-button.tooltip",
-  "appMenu-zoomReset-button": "zoomReset-button.tooltip",
-  "appMenu-zoomReduce-button": "zoomReduce-button.tooltip",
-  "reader-mode-button": "reader-mode-button.tooltip",
-};
-const nodeToShortcutMap = {
-  "bookmarks-menu-button": "manBookmarkKb",
-  "context-reload": "key_reload",
-  "context-stop": "key_stop",
-  "downloads-button": "key_openDownloads",
-  "fullscreen-button": "key_fullScreen",
-  "appMenu-fullscreen-button": "key_fullScreen",
-  "new-window-button": "key_newNavigator",
-  "new-tab-button": "key_newNavigatorTab",
-  "tabs-newtab-button": "key_newNavigatorTab",
-  "reload-button": "key_reload",
-  "stop-button": "key_stop",
-  "urlbar-zoom-button": "key_fullZoomReset",
-  "appMenu-cut-button": "key_cut",
-  "appMenu-copy-button": "key_copy",
-  "appMenu-paste-button": "key_paste",
-  "appMenu-zoomEnlarge-button": "key_fullZoomEnlarge",
-  "appMenu-zoomReset-button": "key_fullZoomReset",
-  "appMenu-zoomReduce-button": "key_fullZoomReduce",
-  "reader-mode-button": "key_toggleReaderMode",
-};
-
-if (AppConstants.platform == "macosx") {
-  nodeToTooltipMap["print-button"] = "printButton.tooltip";
-  nodeToShortcutMap["print-button"] = "printKb";
-}
-
-const gDynamicTooltipCache = new Map();
-function UpdateDynamicShortcutTooltipText(aTooltip) {
-  let nodeId = aTooltip.triggerNode.id || aTooltip.triggerNode.getAttribute("anonid");
-  if (!gDynamicTooltipCache.has(nodeId) && nodeId in nodeToTooltipMap) {
-    let strId = nodeToTooltipMap[nodeId];
-    let args = [];
-    if (nodeId in nodeToShortcutMap) {
-      let shortcutId = nodeToShortcutMap[nodeId];
-      let shortcut = document.getElementById(shortcutId);
-      if (shortcut) {
-        args.push(ShortcutUtils.prettifyShortcut(shortcut));
-      }
-    }
-    gDynamicTooltipCache.set(nodeId, gNavigatorBundle.getFormattedString(strId, args));
-  }
-  aTooltip.setAttribute("label", gDynamicTooltipCache.get(nodeId));
-}
-
-var gWebPanelURI;
-function openWebPanel(title, uri) {
-  // Ensure that the web panels sidebar is open.
-  SidebarUI.show("viewWebPanelsSidebar");
-
-  // Set the title of the panel.
-  SidebarUI.title = title;
-
-  // Tell the Web Panels sidebar to load the bookmark.
-  if (SidebarUI.browser.docShell && SidebarUI.browser.contentDocument &&
-      SidebarUI.browser.contentDocument.getElementById("web-panels-browser")) {
-    SidebarUI.browser.contentWindow.loadWebPanel(uri);
-    if (gWebPanelURI) {
-      gWebPanelURI = "";
-      SidebarUI.browser.removeEventListener("load", asyncOpenWebPanel, true);
-    }
-  } else {
-    // The panel is still being constructed.  Attach an onload handler.
-    if (!gWebPanelURI) {
-      SidebarUI.browser.addEventListener("load", asyncOpenWebPanel, true);
-    }
-    gWebPanelURI = uri;
-  }
-}
-
-function asyncOpenWebPanel(event) {
-  if (gWebPanelURI && SidebarUI.browser.contentDocument &&
-      SidebarUI.browser.contentDocument.getElementById("web-panels-browser")) {
-    SidebarUI.browser.contentWindow.loadWebPanel(gWebPanelURI);
-    SidebarUI.setWebPageIcon(gWebPanelURI);
-  }
-  gWebPanelURI = "";
-  SidebarUI.browser.removeEventListener("load", asyncOpenWebPanel, true);
-}
-
-/*
- * - [ Dependencies ] ---------------------------------------------------------
- *  utilityOverlay.js:
- *    - gatherTextUnder
- */
-
-/**
- * Extracts linkNode and href for the current click target.
- *
- * @param event
- *        The click event.
- * @return [href, linkNode].
- *
- * @note linkNode will be null if the click wasn't on an anchor
- *       element (or XLink).
- */
-function hrefAndLinkNodeForClickEvent(event) {
-  function isHTMLLink(aNode) {
-    // Be consistent with what nsContextMenu.js does.
-    return ((aNode instanceof HTMLAnchorElement && aNode.href) ||
-            (aNode instanceof HTMLAreaElement && aNode.href) ||
-            aNode instanceof HTMLLinkElement);
-  }
-
-  let node = event.target;
-  while (node && !isHTMLLink(node)) {
-    node = node.parentNode;
-  }
-
-  if (node)
-    return [node.href, node];
-
-  // If there is no linkNode, try simple XLink.
-  let href, baseURI;
-  node = event.target;
-  while (node && !href) {
-    if (node.nodeType == Node.ELEMENT_NODE &&
-        (node.localName == "a" ||
-         node.namespaceURI == "http://www.w3.org/1998/Math/MathML")) {
-      href = node.getAttribute("href") ||
-             node.getAttributeNS("http://www.w3.org/1999/xlink", "href");
-
-      if (href) {
-        baseURI = node.baseURI;
-        break;
-      }
-    }
-    node = node.parentNode;
-  }
-
-  // In case of XLink, we don't return the node we got href from since
-  // callers expect <a>-like elements.
-  return [href ? makeURLAbsolute(baseURI, href) : null, null];
-}
-
-/**
- * Called whenever the user clicks in the content area.
- *
- * @param event
- *        The click event.
- * @param isPanelClick
- *        Whether the event comes from a web panel.
- * @note default event is prevented if the click is handled.
- */
-function contentAreaClick(event, isPanelClick) {
-  if (!event.isTrusted || event.defaultPrevented || event.button == 2)
-    return;
-
-  let [href, linkNode] = hrefAndLinkNodeForClickEvent(event);
-  if (!href) {
-    // Not a link, handle middle mouse navigation.
-    if (event.button == 1 &&
-        Services.prefs.getBoolPref("middlemouse.contentLoadURL") &&
-        !Services.prefs.getBoolPref("general.autoScroll")) {
-      middleMousePaste(event);
-      event.preventDefault();
-    }
-    return;
-  }
-
-  // This code only applies if we have a linkNode (i.e. clicks on real anchor
-  // elements, as opposed to XLink).
-  if (linkNode && event.button == 0 &&
-      !event.ctrlKey && !event.shiftKey && !event.altKey && !event.metaKey) {
-    // A Web panel's links should target the main content area.  Do this
-    // if no modifier keys are down and if there's no target or the target
-    // equals _main (the IE convention) or _content (the Mozilla convention).
-    let target = linkNode.target;
-    let mainTarget = !target || target == "_content" || target == "_main";
-    if (isPanelClick && mainTarget) {
-      // javascript and data links should be executed in the current browser.
-      if (linkNode.getAttribute("onclick") ||
-          href.startsWith("javascript:") ||
-          href.startsWith("data:"))
-        return;
-
-      try {
-        urlSecurityCheck(href, linkNode.ownerDocument.nodePrincipal);
-      } catch (ex) {
-        // Prevent loading unsecure destinations.
-        event.preventDefault();
-        return;
-      }
-
-      loadURI(href, null, null, false);
-      event.preventDefault();
-      return;
-    }
-
-    if (linkNode.getAttribute("rel") == "sidebar") {
-      // This is the Opera convention for a special link that, when clicked,
-      // allows to add a sidebar panel.  The link's title attribute contains
-      // the title that should be used for the sidebar panel.
-      PlacesUIUtils.showBookmarkDialog({ action: "add",
-                                         type: "bookmark",
-                                         uri: makeURI(href),
-                                         title: linkNode.getAttribute("title"),
-                                         loadBookmarkInSidebar: true,
-                                         hiddenRows: [ "description",
-                                                       "location",
-                                                       "keyword" ]
-                                       }, window);
-      event.preventDefault();
-      return;
-    }
-  }
-
-  handleLinkClick(event, href, linkNode);
-
-  // Mark the page as a user followed link.  This is done so that history can
-  // distinguish automatic embed visits from user activated ones.  For example
-  // pages loaded in frames are embed visits and lost with the session, while
-  // visits across frames should be preserved.
-  try {
-    if (!PrivateBrowsingUtils.isWindowPrivate(window))
-      PlacesUIUtils.markPageAsFollowedLink(href);
-  } catch (ex) { /* Skip invalid URIs. */ }
-}
-
-/**
- * Handles clicks on links.
- *
- * @return true if the click event was handled, false otherwise.
- */
-function handleLinkClick(event, href, linkNode) {
-  if (event.button == 2) // right click
-    return false;
-
-  var where = whereToOpenLink(event);
-  if (where == "current")
-    return false;
-
-  var doc = event.target.ownerDocument;
-
-  if (where == "save") {
-    saveURL(href, linkNode ? gatherTextUnder(linkNode) : "", null, true,
-            true, doc.documentURIObject, doc);
-    event.preventDefault();
-    return true;
-  }
-
-  var referrerURI = doc.documentURIObject;
-  // if the mixedContentChannel is present and the referring URI passes
-  // a same origin check with the target URI, we can preserve the users
-  // decision of disabling MCB on a page for it's child tabs.
-  var persistAllowMixedContentInChildTab = false;
-
-  if (where == "tab" && gBrowser.docShell.mixedContentChannel) {
-    const sm = Services.scriptSecurityManager;
-    try {
-      var targetURI = makeURI(href);
-      sm.checkSameOriginURI(referrerURI, targetURI, false);
-      persistAllowMixedContentInChildTab = true;
-    } catch (e) { }
-  }
-
-  // first get document wide referrer policy, then
-  // get referrer attribute from clicked link and parse it and
-  // allow per element referrer to overrule the document wide referrer if enabled
-  let referrerPolicy = doc.referrerPolicy;
-  if (linkNode) {
-    let referrerAttrValue = Services.netUtils.parseAttributePolicyString(linkNode.
-                            getAttribute("referrerpolicy"));
-    if (referrerAttrValue != Ci.nsIHttpChannel.REFERRER_POLICY_UNSET) {
-      referrerPolicy = referrerAttrValue;
-    }
-  }
-
-  let frameOuterWindowID = WebNavigationFrames.getFrameId(doc.defaultView);
-
-  urlSecurityCheck(href, doc.nodePrincipal);
-  let params = {
-    charset: doc.characterSet,
-    allowMixedContent: persistAllowMixedContentInChildTab,
-    referrerURI,
-    referrerPolicy,
-    noReferrer: BrowserUtils.linkHasNoReferrer(linkNode),
-    originPrincipal: doc.nodePrincipal,
-    triggeringPrincipal: doc.nodePrincipal,
-    frameOuterWindowID,
-  };
-
-  // The new tab/window must use the same userContextId
-  if (doc.nodePrincipal.originAttributes.userContextId) {
-    params.userContextId = doc.nodePrincipal.originAttributes.userContextId;
-  }
-
-  openLinkIn(href, where, params);
-  event.preventDefault();
-  return true;
-}
-
-/**
- * Handles paste on middle mouse clicks.
- *
- * @param event {Event | Object} Event or JSON object.
- */
-function middleMousePaste(event) {
-  let clipboard = readFromClipboard();
-  if (!clipboard)
-    return;
-
-  // Strip embedded newlines and surrounding whitespace, to match the URL
-  // bar's behavior (stripsurroundingwhitespace)
-  clipboard = clipboard.replace(/\s*\n\s*/g, "");
-
-  clipboard = stripUnsafeProtocolOnPaste(clipboard);
-
-  // if it's not the current tab, we don't need to do anything because the
-  // browser doesn't exist.
-  let where = whereToOpenLink(event, true, false);
-  let lastLocationChange;
-  if (where == "current") {
-    lastLocationChange = gBrowser.selectedBrowser.lastLocationChange;
-  }
-
-  getShortcutOrURIAndPostData(clipboard).then(data => {
-    try {
-      makeURI(data.url);
-    } catch (ex) {
-      // Not a valid URI.
-      return;
-    }
-
-    try {
-      addToUrlbarHistory(data.url);
-    } catch (ex) {
-      // Things may go wrong when adding url to session history,
-      // but don't let that interfere with the loading of the url.
-      Cu.reportError(ex);
-    }
-
-    if (where != "current" ||
-        lastLocationChange == gBrowser.selectedBrowser.lastLocationChange) {
-      openUILink(data.url, event,
-                 { ignoreButton: true,
-                   disallowInheritPrincipal: !data.mayInheritPrincipal });
-    }
-  });
-
-  if (event instanceof Event) {
-    event.stopPropagation();
-  }
-}
-
-function stripUnsafeProtocolOnPaste(pasteData) {
-  // Don't allow pasting javascript URIs since we don't support
-  // LOAD_FLAGS_DISALLOW_INHERIT_PRINCIPAL for those.
-  while (true) {
-    let scheme = "";
-    try {
-      scheme = Services.io.extractScheme(pasteData);
-    } catch (ex) { }
-    if (scheme != "javascript") {
-      break;
-    }
-
-    pasteData = pasteData.substring(pasteData.indexOf(":") + 1);
-  }
-  return pasteData;
-}
-
-// handleDroppedLink has the following 2 overloads:
-//   handleDroppedLink(event, url, name, triggeringPrincipal)
-//   handleDroppedLink(event, links, triggeringPrincipal)
-function handleDroppedLink(event, urlOrLinks, nameOrTriggeringPrincipal, triggeringPrincipal) {
-  let links;
-  if (Array.isArray(urlOrLinks)) {
-    links = urlOrLinks;
-    triggeringPrincipal = nameOrTriggeringPrincipal;
-  } else {
-    links = [{ url: urlOrLinks, nameOrTriggeringPrincipal, type: "" }];
-  }
-
-  let lastLocationChange = gBrowser.selectedBrowser.lastLocationChange;
-
-  let userContextId = gBrowser.selectedBrowser.getAttribute("usercontextid");
-
-  // event is null if links are dropped in content process.
-  // inBackground should be false, as it's loading into current browser.
-  let inBackground = false;
-  if (event) {
-    inBackground = Services.prefs.getBoolPref("browser.tabs.loadInBackground");
-    if (event.shiftKey)
-      inBackground = !inBackground;
-  }
-
-  (async function() {
-    if (links.length >= Services.prefs.getIntPref("browser.tabs.maxOpenBeforeWarn")) {
-      // Sync dialog cannot be used inside drop event handler.
-      let answer = await OpenInTabsUtils.promiseConfirmOpenInTabs(links.length,
-                                                                  window);
-      if (!answer) {
-        return;
-      }
-    }
-
-    let urls = [];
-    let postDatas = [];
-    for (let link of links) {
-      let data = await getShortcutOrURIAndPostData(link.url);
-      urls.push(data.url);
-      postDatas.push(data.postData);
-    }
-    if (lastLocationChange == gBrowser.selectedBrowser.lastLocationChange) {
-      gBrowser.loadTabs(urls, {
-        inBackground,
-        replace: true,
-        allowThirdPartyFixup: false,
-        postDatas,
-        userContextId,
-        triggeringPrincipal,
-      });
-    }
-  })();
-
-  // If links are dropped in content process, event.preventDefault() should be
-  // called in content process.
-  if (event) {
-    // Keep the event from being handled by the dragDrop listeners
-    // built-in to gecko if they happen to be above us.
-    event.preventDefault();
-  }
-}
-
-function BrowserSetForcedCharacterSet(aCharset) {
-  if (aCharset) {
-    gBrowser.selectedBrowser.characterSet = aCharset;
-    // Save the forced character-set
-    if (!PrivateBrowsingUtils.isWindowPrivate(window))
-      PlacesUtils.setCharsetForURI(getWebNavigation().currentURI, aCharset);
-  }
-  BrowserCharsetReload();
-}
-
-function BrowserCharsetReload() {
-  BrowserReloadWithFlags(Ci.nsIWebNavigation.LOAD_FLAGS_CHARSET_CHANGE);
-}
-
-function UpdateCurrentCharset(target) {
-  let selectedCharset = CharsetMenu.foldCharset(gBrowser.selectedBrowser.characterSet);
-  for (let menuItem of target.getElementsByTagName("menuitem")) {
-    let isSelected = menuItem.getAttribute("charset") === selectedCharset;
-    menuItem.setAttribute("checked", isSelected);
-  }
-}
-
-var gPageStyleMenu = {
-  // This maps from a <browser> element (or, more specifically, a
-  // browser's permanentKey) to an Object that contains the most recent
-  // information about the browser content's stylesheets. That Object
-  // is populated via the PageStyle:StyleSheets message from the content
-  // process. The Object should have the following structure:
-  //
-  // filteredStyleSheets (Array):
-  //   An Array of objects with a filtered list representing all stylesheets
-  //   that the current page offers. Each object has the following members:
-  //
-  //   title (String):
-  //     The title of the stylesheet
-  //
-  //   disabled (bool):
-  //     Whether or not the stylesheet is currently applied
-  //
-  //   href (String):
-  //     The URL of the stylesheet. Stylesheets loaded via a data URL will
-  //     have this property set to null.
-  //
-  // authorStyleDisabled (bool):
-  //   Whether or not the user currently has "No Style" selected for
-  //   the current page.
-  //
-  // preferredStyleSheetSet (bool):
-  //   Whether or not the user currently has the "Default" style selected
-  //   for the current page.
-  //
-  _pageStyleSheets: new WeakMap(),
-
-  init() {
-    let mm = window.messageManager;
-    mm.addMessageListener("PageStyle:StyleSheets", (msg) => {
-      this._pageStyleSheets.set(msg.target.permanentKey, msg.data);
-    });
-  },
-
-  /**
-   * Returns an array of Objects representing stylesheets in a
-   * browser. Note that the pageshow event needs to fire in content
-   * before this information will be available.
-   *
-   * @param browser (optional)
-   *        The <xul:browser> to search for stylesheets. If omitted, this
-   *        defaults to the currently selected tab's browser.
-   * @returns Array
-   *        An Array of Objects representing stylesheets in the browser.
-   *        See the documentation for gPageStyleMenu for a description
-   *        of the Object structure.
-   */
-  getBrowserStyleSheets(browser) {
-    if (!browser) {
-      browser = gBrowser.selectedBrowser;
-    }
-
-    let data = this._pageStyleSheets.get(browser.permanentKey);
-    if (!data) {
-      return [];
-    }
-    return data.filteredStyleSheets;
-  },
-
-  _getStyleSheetInfo(browser) {
-    let data = this._pageStyleSheets.get(browser.permanentKey);
-    if (!data) {
-      return {
-        filteredStyleSheets: [],
-        authorStyleDisabled: false,
-        preferredStyleSheetSet: true
-      };
-    }
-
-    return data;
-  },
-
-  fillPopup(menuPopup) {
-    let styleSheetInfo = this._getStyleSheetInfo(gBrowser.selectedBrowser);
-    var noStyle = menuPopup.firstChild;
-    var persistentOnly = noStyle.nextSibling;
-    var sep = persistentOnly.nextSibling;
-    while (sep.nextSibling)
-      menuPopup.removeChild(sep.nextSibling);
-
-    let styleSheets = styleSheetInfo.filteredStyleSheets;
-    var currentStyleSheets = {};
-    var styleDisabled = styleSheetInfo.authorStyleDisabled;
-    var haveAltSheets = false;
-    var altStyleSelected = false;
-
-    for (let currentStyleSheet of styleSheets) {
-      if (!currentStyleSheet.disabled)
-        altStyleSelected = true;
-
-      haveAltSheets = true;
-
-      let lastWithSameTitle = null;
-      if (currentStyleSheet.title in currentStyleSheets)
-        lastWithSameTitle = currentStyleSheets[currentStyleSheet.title];
-
-      if (!lastWithSameTitle) {
-        let menuItem = document.createElement("menuitem");
-        menuItem.setAttribute("type", "radio");
-        menuItem.setAttribute("label", currentStyleSheet.title);
-        menuItem.setAttribute("data", currentStyleSheet.title);
-        menuItem.setAttribute("checked", !currentStyleSheet.disabled && !styleDisabled);
-        menuItem.setAttribute("oncommand", "gPageStyleMenu.switchStyleSheet(this.getAttribute('data'));");
-        menuPopup.appendChild(menuItem);
-        currentStyleSheets[currentStyleSheet.title] = menuItem;
-      } else if (currentStyleSheet.disabled) {
-        lastWithSameTitle.removeAttribute("checked");
-      }
-    }
-
-    noStyle.setAttribute("checked", styleDisabled);
-    persistentOnly.setAttribute("checked", !altStyleSelected && !styleDisabled);
-    persistentOnly.hidden = styleSheetInfo.preferredStyleSheetSet ? haveAltSheets : false;
-    sep.hidden = (noStyle.hidden && persistentOnly.hidden) || !haveAltSheets;
-  },
-
-  switchStyleSheet(title) {
-    let mm = gBrowser.selectedBrowser.messageManager;
-    mm.sendAsyncMessage("PageStyle:Switch", {title});
-  },
-
-  disableStyle() {
-    let mm = gBrowser.selectedBrowser.messageManager;
-    mm.sendAsyncMessage("PageStyle:Disable");
-  },
-};
-
-var LanguageDetectionListener = {
-  init() {
-    window.messageManager.addMessageListener("Translation:DocumentState", msg => {
-      Translation.documentStateReceived(msg.target, msg.data);
-    });
-  }
-};
-
-
-var BrowserOffline = {
-  _inited: false,
-
-  // BrowserOffline Public Methods
-  init() {
-    if (!this._uiElement)
-      this._uiElement = document.getElementById("workOfflineMenuitemState");
-
-    Services.obs.addObserver(this, "network:offline-status-changed");
-
-    this._updateOfflineUI(Services.io.offline);
-
-    this._inited = true;
-  },
-
-  uninit() {
-    if (this._inited) {
-      Services.obs.removeObserver(this, "network:offline-status-changed");
-    }
-  },
-
-  toggleOfflineStatus() {
-    var ioService = Services.io;
-
-    if (!ioService.offline && !this._canGoOffline()) {
-      this._updateOfflineUI(false);
-      return;
-    }
-
-    ioService.offline = !ioService.offline;
-  },
-
-  // nsIObserver
-  observe(aSubject, aTopic, aState) {
-    if (aTopic != "network:offline-status-changed")
-      return;
-
-    // This notification is also received because of a loss in connectivity,
-    // which we ignore by updating the UI to the current value of io.offline
-    this._updateOfflineUI(Services.io.offline);
-  },
-
-  // BrowserOffline Implementation Methods
-  _canGoOffline() {
-    try {
-      var cancelGoOffline = Cc["@mozilla.org/supports-PRBool;1"].createInstance(Ci.nsISupportsPRBool);
-      Services.obs.notifyObservers(cancelGoOffline, "offline-requested");
-
-      // Something aborted the quit process.
-      if (cancelGoOffline.data)
-        return false;
-    } catch (ex) {
-    }
-
-    return true;
-  },
-
-  _uiElement: null,
-  _updateOfflineUI(aOffline) {
-    var offlineLocked = Services.prefs.prefIsLocked("network.online");
-    if (offlineLocked)
-      this._uiElement.setAttribute("disabled", "true");
-
-    this._uiElement.setAttribute("checked", aOffline);
-  }
-};
-
-var OfflineApps = {
-  warnUsage(browser, uri) {
-    if (!browser)
-      return;
-
-    let mainAction = {
-      label: gNavigatorBundle.getString("offlineApps.manageUsage"),
-      accessKey: gNavigatorBundle.getString("offlineApps.manageUsageAccessKey"),
-      callback: this.manage
-    };
-
-    let warnQuotaKB = Services.prefs.getIntPref("offline-apps.quota.warn");
-    // This message shows the quota in MB, and so we divide the quota (in kb) by 1024.
-    let message = gNavigatorBundle.getFormattedString("offlineApps.usage",
-                                                      [ uri.host,
-                                                        warnQuotaKB / 1024 ]);
-
-    let anchorID = "indexedDB-notification-icon";
-    let options = {
-      persistent: true,
-      hideClose: true,
-    };
-    PopupNotifications.show(browser, "offline-app-usage", message,
-                            anchorID, mainAction, null, options);
-
-    // Now that we've warned once, prevent the warning from showing up
-    // again.
-    Services.perms.add(uri, "offline-app",
-                       Ci.nsIOfflineCacheUpdateService.ALLOW_NO_WARN);
-  },
-
-  // XXX: duplicated in preferences/advanced.js
-  _getOfflineAppUsage(host, groups) {
-    let cacheService = Cc["@mozilla.org/network/application-cache-service;1"].
-                       getService(Ci.nsIApplicationCacheService);
-    if (!groups) {
-      try {
-        groups = cacheService.getGroups();
-      } catch (ex) {
-        return 0;
-      }
-    }
-
-    let usage = 0;
-    for (let group of groups) {
-      let uri = Services.io.newURI(group);
-      if (uri.asciiHost == host) {
-        let cache = cacheService.getActiveCache(group);
-        usage += cache.usage;
-      }
-    }
-
-    return usage;
-  },
-
-  _usedMoreThanWarnQuota(uri) {
-    // if the user has already allowed excessive usage, don't bother checking
-    if (Services.perms.testExactPermission(uri, "offline-app") !=
-        Ci.nsIOfflineCacheUpdateService.ALLOW_NO_WARN) {
-      let usageBytes = this._getOfflineAppUsage(uri.asciiHost);
-      let warnQuotaKB = Services.prefs.getIntPref("offline-apps.quota.warn");
-      // The pref is in kb, the usage we get is in bytes, so multiply the quota
-      // to compare correctly:
-      if (usageBytes >= warnQuotaKB * 1024) {
-        return true;
-      }
-    }
-
-    return false;
-  },
-
-  requestPermission(browser, docId, uri) {
-    let host = uri.asciiHost;
-    let notificationID = "offline-app-requested-" + host;
-    let notification = PopupNotifications.getNotification(notificationID, browser);
-
-    if (notification) {
-      notification.options.controlledItems.push([
-        Cu.getWeakReference(browser), docId, uri
-      ]);
-    } else {
-      let mainAction = {
-        label: gNavigatorBundle.getString("offlineApps.allowStoring.label"),
-        accessKey: gNavigatorBundle.getString("offlineApps.allowStoring.accesskey"),
-        callback() {
-          for (let [ciBrowser, ciDocId, ciUri] of notification.options.controlledItems) {
-            OfflineApps.allowSite(ciBrowser, ciDocId, ciUri);
-          }
-        }
-      };
-      let secondaryActions = [{
-        label: gNavigatorBundle.getString("offlineApps.dontAllow.label"),
-        accessKey: gNavigatorBundle.getString("offlineApps.dontAllow.accesskey"),
-        callback() {
-          for (let [, , ciUri] of notification.options.controlledItems) {
-            OfflineApps.disallowSite(ciUri);
-          }
-        }
-      }];
-      let message = gNavigatorBundle.getFormattedString("offlineApps.available2",
-                                                        [host]);
-      let anchorID = "indexedDB-notification-icon";
-      let options = {
-        persistent: true,
-        hideClose: true,
-        controlledItems: [[Cu.getWeakReference(browser), docId, uri]]
-      };
-      notification = PopupNotifications.show(browser, notificationID, message,
-                                             anchorID, mainAction,
-                                             secondaryActions, options);
-    }
-  },
-
-  disallowSite(uri) {
-    Services.perms.add(uri, "offline-app", Services.perms.DENY_ACTION);
-  },
-
-  allowSite(browserRef, docId, uri) {
-    Services.perms.add(uri, "offline-app", Services.perms.ALLOW_ACTION);
-
-    // When a site is enabled while loading, manifest resources will
-    // start fetching immediately.  This one time we need to do it
-    // ourselves.
-    let browser = browserRef.get();
-    if (browser && browser.messageManager) {
-      browser.messageManager.sendAsyncMessage("OfflineApps:StartFetching", {
-        docId,
-      });
-    }
-  },
-
-  manage() {
-    openPreferences("panePrivacy", { origin: "offlineApps" });
-  },
-
-  receiveMessage(msg) {
-    switch (msg.name) {
-      case "OfflineApps:CheckUsage":
-        let uri = makeURI(msg.data.uri);
-        if (this._usedMoreThanWarnQuota(uri)) {
-          this.warnUsage(msg.target, uri);
-        }
-        break;
-      case "OfflineApps:RequestPermission":
-        this.requestPermission(msg.target, msg.data.docId, makeURI(msg.data.uri));
-        break;
-    }
-  },
-
-  init() {
-    let mm = window.messageManager;
-    mm.addMessageListener("OfflineApps:CheckUsage", this);
-    mm.addMessageListener("OfflineApps:RequestPermission", this);
-  },
-};
-
-var IndexedDBPromptHelper = {
-  _permissionsPrompt: "indexedDB-permissions-prompt",
-  _permissionsResponse: "indexedDB-permissions-response",
-
-  _notificationIcon: "indexedDB-notification-icon",
-
-  init:
-  function IndexedDBPromptHelper_init() {
-    Services.obs.addObserver(this, this._permissionsPrompt);
-  },
-
-  uninit:
-  function IndexedDBPromptHelper_uninit() {
-    Services.obs.removeObserver(this, this._permissionsPrompt);
-  },
-
-  observe:
-  function IndexedDBPromptHelper_observe(subject, topic, data) {
-    if (topic != this._permissionsPrompt) {
-      throw new Error("Unexpected topic!");
-    }
-
-    var requestor = subject.QueryInterface(Ci.nsIInterfaceRequestor);
-
-    var browser = requestor.getInterface(Ci.nsIDOMNode);
-    if (browser.ownerGlobal != window) {
-      // Only listen for notifications for browsers in our chrome window.
-      return;
-    }
-
-    // Get the host name if available or the file path otherwise.
-    var host = browser.currentURI.asciiHost || browser.currentURI.pathQueryRef;
-
-    var message;
-    var responseTopic;
-    if (topic == this._permissionsPrompt) {
-      message = gNavigatorBundle.getFormattedString("offlineApps.available2",
-                                                    [ host ]);
-      responseTopic = this._permissionsResponse;
-    }
-
-    var observer = requestor.getInterface(Ci.nsIObserver);
-
-    var mainAction = {
-      label: gNavigatorBundle.getString("offlineApps.allowStoring.label"),
-      accessKey: gNavigatorBundle.getString("offlineApps.allowStoring.accesskey"),
-      callback() {
-        observer.observe(null, responseTopic,
-                         Ci.nsIPermissionManager.ALLOW_ACTION);
-      }
-    };
-
-    var secondaryActions = [
-      {
-        label: gNavigatorBundle.getString("offlineApps.dontAllow.label"),
-        accessKey: gNavigatorBundle.getString("offlineApps.dontAllow.accesskey"),
-        callback() {
-          observer.observe(null, responseTopic,
-                           Ci.nsIPermissionManager.DENY_ACTION);
-        }
-      }
-    ];
-
-    PopupNotifications.show(
-      browser, topic, message, this._notificationIcon, mainAction, secondaryActions,
-      {
-        persistent: true,
-        hideClose: !Services.prefs.getBoolPref("privacy.permissionPrompts.showCloseButton"),
-      });
-  }
-};
-
-var CanvasPermissionPromptHelper = {
-  _permissionsPrompt: "canvas-permissions-prompt",
-  _notificationIcon: "canvas-notification-icon",
-
-  init() {
-    Services.obs.addObserver(this, this._permissionsPrompt);
-  },
-
-  uninit() {
-    Services.obs.removeObserver(this, this._permissionsPrompt);
-  },
-
-  // aSubject is an nsIBrowser (e10s) or an nsIDOMWindow (non-e10s).
-  // aData is an URL string.
-  observe(aSubject, aTopic, aData) {
-    if (aTopic != this._permissionsPrompt) {
-      return;
-    }
-
-    let browser;
-    if (aSubject instanceof Ci.nsIDOMWindow) {
-      let contentWindow = aSubject.QueryInterface(Ci.nsIDOMWindow);
-      browser = gBrowser.getBrowserForContentWindow(contentWindow);
-    } else {
-      browser = aSubject.QueryInterface(Ci.nsIBrowser);
-    }
-
-    let uri = Services.io.newURI(aData);
-    if (gBrowser.selectedBrowser !== browser) {
-      // Must belong to some other window.
-      return;
-    }
-
-    let message = gNavigatorBundle.getFormattedString("canvas.siteprompt", ["<>"], 1);
-
-    function setCanvasPermission(aURI, aPerm, aPersistent) {
-      Services.perms.add(aURI, "canvas", aPerm,
-                          aPersistent ? Ci.nsIPermissionManager.EXPIRE_NEVER
-                                      : Ci.nsIPermissionManager.EXPIRE_SESSION);
-    }
-
-    let mainAction = {
-      label: gNavigatorBundle.getString("canvas.allow"),
-      accessKey: gNavigatorBundle.getString("canvas.allow.accesskey"),
-      callback(state) {
-        setCanvasPermission(uri, Ci.nsIPermissionManager.ALLOW_ACTION,
-                            state && state.checkboxChecked);
-      }
-    };
-
-    let secondaryActions = [{
-      label: gNavigatorBundle.getString("canvas.notAllow"),
-      accessKey: gNavigatorBundle.getString("canvas.notAllow.accesskey"),
-      callback(state) {
-        setCanvasPermission(uri, Ci.nsIPermissionManager.DENY_ACTION,
-                            state && state.checkboxChecked);
-      }
-    }];
-
-    let checkbox = {
-      // In PB mode, we don't want the "always remember" checkbox
-      show: !PrivateBrowsingUtils.isWindowPrivate(window)
-    };
-    if (checkbox.show) {
-      checkbox.checked = true;
-      checkbox.label = gBrowserBundle.GetStringFromName("canvas.remember");
-    }
-
-    let options = {
-      checkbox,
-      name: uri.asciiHost,
-      learnMoreURL: Services.urlFormatter.formatURLPref("app.support.baseURL") + "fingerprint-permission",
-    };
-    PopupNotifications.show(browser, aTopic, message, this._notificationIcon,
-                            mainAction, secondaryActions, options);
-  }
-};
-
-var WebAuthnPromptHelper = {
-  _icon: "webauthn-notification-icon",
-  _topic: "webauthn-prompt",
-
-  // The current notification, if any. The U2F manager is a singleton, we will
-  // never allow more than one active request. And thus we'll never have more
-  // than one notification either.
-  _current: null,
-
-  // The current transaction ID. Will be checked when we're notified of the
-  // cancellation of an ongoing WebAuthhn request.
-  _tid: 0,
-
-  init() {
-    Services.obs.addObserver(this, this._topic);
-  },
-
-  uninit() {
-    Services.obs.removeObserver(this, this._topic);
-  },
-
-  observe(aSubject, aTopic, aData) {
-    let mgr = aSubject.QueryInterface(Ci.nsIU2FTokenManager);
-    let data = JSON.parse(aData);
-
-    if (data.action == "register") {
-      this.register(mgr, data);
-    } else if (data.action == "register-direct") {
-      this.registerDirect(mgr, data);
-    } else if (data.action == "sign") {
-      this.sign(mgr, data);
-    } else if (data.action == "cancel") {
-      this.cancel(data);
-    }
-  },
-
-  register(mgr, {origin, tid}) {
-    let mainAction = this.buildCancelAction(mgr, tid);
-    this.show(tid, "register", "webauthn.registerPrompt", origin, mainAction);
-  },
-
-  registerDirect(mgr, {origin, tid}) {
-    let mainAction = this.buildProceedAction(mgr, tid);
-    let secondaryActions = [this.buildCancelAction(mgr, tid)];
-
-    let learnMoreURL =
-      Services.urlFormatter.formatURLPref("app.support.baseURL") +
-      "webauthn-direct-attestation";
-
-    let options = {
-      learnMoreURL,
-      checkbox: {
-        label: gNavigatorBundle.getString("webauthn.anonymize")
-      }
-    };
-
-    this.show(tid, "register-direct", "webauthn.registerDirectPrompt",
-              origin, mainAction, secondaryActions, options);
-  },
-
-  sign(mgr, {origin, tid}) {
-    let mainAction = this.buildCancelAction(mgr, tid);
-    this.show(tid, "sign", "webauthn.signPrompt", origin, mainAction);
-  },
-
-  show(tid, id, stringId, origin, mainAction, secondaryActions = [], options = {}) {
-    this.reset();
-
-    try {
-      origin = Services.io.newURI(origin).asciiHost;
-    } catch (e) {
-      /* Might fail for arbitrary U2F RP IDs. */
-    }
-
-    let brandShortName =
-      document.getElementById("bundle_brand").getString("brandShortName");
-    let message =
-      gNavigatorBundle.getFormattedString(stringId, ["<>", brandShortName], 1);
-
-    options.name = origin;
-    options.hideClose = true;
-    options.eventCallback = event => {
-      if (event == "removed") {
-        this._current = null;
-        this._tid = 0;
-      }
-    };
-
-    this._tid = tid;
-    this._current = PopupNotifications.show(
-      gBrowser.selectedBrowser, `webauthn-prompt-${id}`, message,
-      this._icon, mainAction, secondaryActions, options);
-  },
-
-  cancel({tid}) {
-    if (this._tid == tid) {
-      this.reset();
-    }
-  },
-
-  reset() {
-    if (this._current) {
-      this._current.remove();
-    }
-  },
-
-  buildProceedAction(mgr, tid) {
-    return {
-      label: gNavigatorBundle.getString("webauthn.proceed"),
-      accessKey: gNavigatorBundle.getString("webauthn.proceed.accesskey"),
-      callback(state) {
-        mgr.resumeRegister(tid, !state.checkboxChecked);
-      }
-    };
-  },
-
-  buildCancelAction(mgr, tid) {
-    return {
-      label: gNavigatorBundle.getString("webauthn.cancel"),
-      accessKey: gNavigatorBundle.getString("webauthn.cancel.accesskey"),
-      callback() {
-        mgr.cancel(tid);
-      }
-    };
-  },
-};
-
-function CanCloseWindow() {
-  // Avoid redundant calls to canClose from showing multiple
-  // PermitUnload dialogs.
-  if (Services.startup.shuttingDown || window.skipNextCanClose) {
-    return true;
-  }
-
-  let timedOutProcesses = new WeakSet();
-
-  for (let browser of gBrowser.browsers) {
-    // Don't instantiate lazy browsers.
-    if (!browser.isConnected) {
-      continue;
-    }
-
-    let pmm = browser.messageManager.processMessageManager;
-
-    if (timedOutProcesses.has(pmm)) {
-      continue;
-    }
-
-    let {permitUnload, timedOut} = browser.permitUnload();
-
-    if (timedOut) {
-      timedOutProcesses.add(pmm);
-      continue;
-    }
-
-    if (!permitUnload) {
-      return false;
-    }
-  }
-  return true;
-}
-
-function WindowIsClosing() {
-  if (!closeWindow(false, warnAboutClosingWindow))
-    return false;
-
-  // In theory we should exit here and the Window's internal Close
-  // method should trigger canClose on nsBrowserAccess. However, by
-  // that point it's too late to be able to show a prompt for
-  // PermitUnload. So we do it here, when we still can.
-  if (CanCloseWindow()) {
-    // This flag ensures that the later canClose call does nothing.
-    // It's only needed to make tests pass, since they detect the
-    // prompt even when it's not actually shown.
-    window.skipNextCanClose = true;
-    return true;
-  }
-
-  return false;
-}
-
-/**
- * Checks if this is the last full *browser* window around. If it is, this will
- * be communicated like quitting. Otherwise, we warn about closing multiple tabs.
- * @returns true if closing can proceed, false if it got cancelled.
- */
-function warnAboutClosingWindow() {
-  // Popups aren't considered full browser windows; we also ignore private windows.
-  let isPBWindow = PrivateBrowsingUtils.isWindowPrivate(window) &&
-        !PrivateBrowsingUtils.permanentPrivateBrowsing;
-  if (!isPBWindow && !toolbar.visible)
-    return gBrowser.warnAboutClosingTabs(gBrowser.closingTabsEnum.ALL);
-
-  // Figure out if there's at least one other browser window around.
-  let otherPBWindowExists = false;
-  let nonPopupPresent = false;
-  for (let win of browserWindows()) {
-    if (!win.closed && win != window) {
-      if (isPBWindow && PrivateBrowsingUtils.isWindowPrivate(win))
-        otherPBWindowExists = true;
-      if (win.toolbar.visible)
-        nonPopupPresent = true;
-      // If the current window is not in private browsing mode we don't need to
-      // look for other pb windows, we can leave the loop when finding the
-      // first non-popup window. If however the current window is in private
-      // browsing mode then we need at least one other pb and one non-popup
-      // window to break out early.
-      if ((!isPBWindow || otherPBWindowExists) && nonPopupPresent)
-        break;
-    }
-  }
-
-  if (isPBWindow && !otherPBWindowExists) {
-    let exitingCanceled = Cc["@mozilla.org/supports-PRBool;1"].
-                          createInstance(Ci.nsISupportsPRBool);
-    exitingCanceled.data = false;
-    Services.obs.notifyObservers(exitingCanceled,
-                                 "last-pb-context-exiting");
-    if (exitingCanceled.data)
-      return false;
-  }
-
-  if (nonPopupPresent) {
-    return isPBWindow || gBrowser.warnAboutClosingTabs(gBrowser.closingTabsEnum.ALL);
-  }
-
-  let os = Services.obs;
-
-  let closingCanceled = Cc["@mozilla.org/supports-PRBool;1"].
-                        createInstance(Ci.nsISupportsPRBool);
-  os.notifyObservers(closingCanceled,
-                     "browser-lastwindow-close-requested");
-  if (closingCanceled.data)
-    return false;
-
-  os.notifyObservers(null, "browser-lastwindow-close-granted");
-
-  // OS X doesn't quit the application when the last window is closed, but keeps
-  // the session alive. Hence don't prompt users to save tabs, but warn about
-  // closing multiple tabs.
-  return AppConstants.platform != "macosx"
-         || (isPBWindow || gBrowser.warnAboutClosingTabs(gBrowser.closingTabsEnum.ALL));
-}
-
-var MailIntegration = {
-  sendLinkForBrowser(aBrowser) {
-    this.sendMessage(gURLBar.makeURIReadable(aBrowser.currentURI).displaySpec, aBrowser.contentTitle);
-  },
-
-  sendMessage(aBody, aSubject) {
-    // generate a mailto url based on the url and the url's title
-    var mailtoUrl = "mailto:";
-    if (aBody) {
-      mailtoUrl += "?body=" + encodeURIComponent(aBody);
-      mailtoUrl += "&subject=" + encodeURIComponent(aSubject);
-    }
-
-    var uri = makeURI(mailtoUrl);
-
-    // now pass this uri to the operating system
-    this._launchExternalUrl(uri);
-  },
-
-  // a generic method which can be used to pass arbitrary urls to the operating
-  // system.
-  // aURL --> a nsIURI which represents the url to launch
-  _launchExternalUrl(aURL) {
-    var extProtocolSvc =
-       Cc["@mozilla.org/uriloader/external-protocol-service;1"]
-         .getService(Ci.nsIExternalProtocolService);
-    if (extProtocolSvc)
-      extProtocolSvc.loadURI(aURL);
-  }
-};
-
-function BrowserOpenAddonsMgr(aView) {
-  return new Promise(resolve => {
-    let emWindow;
-    let browserWindow;
-
-    var receivePong = function(aSubject, aTopic, aData) {
-      let browserWin = aSubject.QueryInterface(Ci.nsIInterfaceRequestor)
-                               .getInterface(Ci.nsIWebNavigation)
-                               .QueryInterface(Ci.nsIDocShellTreeItem)
-                               .rootTreeItem
-                               .QueryInterface(Ci.nsIInterfaceRequestor)
-                               .getInterface(Ci.nsIDOMWindow);
-      if (!emWindow || browserWin == window /* favor the current window */) {
-        emWindow = aSubject;
-        browserWindow = browserWin;
-      }
-    };
-    Services.obs.addObserver(receivePong, "EM-pong");
-    Services.obs.notifyObservers(null, "EM-ping");
-    Services.obs.removeObserver(receivePong, "EM-pong");
-
-    if (emWindow) {
-      if (aView) {
-        emWindow.loadView(aView);
-      }
-      browserWindow.gBrowser.selectedTab =
-        browserWindow.gBrowser._getTabForContentWindow(emWindow);
-      emWindow.focus();
-      resolve(emWindow);
-      return;
-    }
-
-    // This must be a new load, else the ping/pong would have
-    // found the window above.
-    let whereToOpen = (window.gBrowser && isTabEmpty(gBrowser.selectedTab)) ?
-                      "current" :
-                      "tab";
-    openUILinkIn("about:addons", whereToOpen);
-
-    Services.obs.addObserver(function observer(aSubject, aTopic, aData) {
-      Services.obs.removeObserver(observer, aTopic);
-      if (aView) {
-        aSubject.loadView(aView);
-      }
-      aSubject.QueryInterface(Ci.nsIDOMWindow);
-      aSubject.focus();
-      resolve(aSubject);
-    }, "EM-loaded");
-  });
-}
-
-function AddKeywordForSearchField() {
-  let mm = gBrowser.selectedBrowser.messageManager;
-
-  let onMessage = (message) => {
-    mm.removeMessageListener("ContextMenu:SearchFieldBookmarkData:Result", onMessage);
-
-    let bookmarkData = message.data;
-    let title = gNavigatorBundle.getFormattedString("addKeywordTitleAutoFill",
-                                                    [bookmarkData.title]);
-    PlacesUIUtils.showBookmarkDialog({ action: "add",
-                                       type: "bookmark",
-                                       uri: makeURI(bookmarkData.spec),
-                                       title,
-                                       description: bookmarkData.description,
-                                       keyword: "",
-                                       postData: bookmarkData.postData,
-                                       charSet: bookmarkData.charset,
-                                       hiddenRows: [ "location",
-                                                     "description",
-                                                     "tags",
-                                                     "loadInSidebar" ]
-                                     }, window);
-  };
-  mm.addMessageListener("ContextMenu:SearchFieldBookmarkData:Result", onMessage);
-
-  mm.sendAsyncMessage("ContextMenu:SearchFieldBookmarkData", {}, { target: gContextMenu.target });
-}
-
-/**
- * Re-open a closed tab.
- * @param aIndex
- *        The index of the tab (via SessionStore.getClosedTabData)
- * @returns a reference to the reopened tab.
- */
-function undoCloseTab(aIndex) {
-  // wallpaper patch to prevent an unnecessary blank tab (bug 343895)
-  var blankTabToRemove = null;
-  if (gBrowser.tabs.length == 1 && isTabEmpty(gBrowser.selectedTab))
-    blankTabToRemove = gBrowser.selectedTab;
-
-  var tab = null;
-  if (SessionStore.getClosedTabCount(window) > (aIndex || 0)) {
-    tab = SessionStore.undoCloseTab(window, aIndex || 0);
-
-    if (blankTabToRemove)
-      gBrowser.removeTab(blankTabToRemove);
-  }
-
-  return tab;
-}
-
-/**
- * Re-open a closed window.
- * @param aIndex
- *        The index of the window (via SessionStore.getClosedWindowData)
- * @returns a reference to the reopened window.
- */
-function undoCloseWindow(aIndex) {
-  let window = null;
-  if (SessionStore.getClosedWindowCount() > (aIndex || 0))
-    window = SessionStore.undoCloseWindow(aIndex || 0);
-
-  return window;
-}
-
-/*
- * Determines if a tab is "empty", usually used in the context of determining
- * if it's ok to close the tab.
- */
-function isTabEmpty(aTab) {
-  if (aTab.hasAttribute("busy"))
-    return false;
-
-  if (aTab.hasAttribute("customizemode"))
-    return false;
-
-  let browser = aTab.linkedBrowser;
-  if (!isBlankPageURL(browser.currentURI.spec))
-    return false;
-
-  if (!checkEmptyPageOrigin(browser))
-    return false;
-
-  if (browser.canGoForward || browser.canGoBack)
-    return false;
-
-  return true;
-}
-
-/**
- * Check whether a page can be considered as 'empty', that its URI
- * reflects its origin, and that if it's loaded in a tab, that tab
- * could be considered 'empty' (e.g. like the result of opening
- * a 'blank' new tab).
- *
- * We have to do more than just check the URI, because especially
- * for things like about:blank, it is possible that the opener or
- * some other page has control over the contents of the page.
- *
- * @param browser {Browser}
- *        The browser whose page we're checking (the selected browser
- *        in this window if omitted).
- * @param uri {nsIURI}
- *        The URI against which we're checking (the browser's currentURI
- *        if omitted).
- *
- * @return false if the page was opened by or is controlled by arbitrary web
- *         content, unless that content corresponds with the URI.
- *         true if the page is blank and controlled by a principal matching
- *         that URI (or the system principal if the principal has no URI)
- */
-function checkEmptyPageOrigin(browser = gBrowser.selectedBrowser,
-                              uri = browser.currentURI) {
-  // If another page opened this page with e.g. window.open, this page might
-  // be controlled by its opener - return false.
-  if (browser.hasContentOpener) {
-    return false;
-  }
-  let contentPrincipal = browser.contentPrincipal;
-  // Not all principals have URIs...
-  if (contentPrincipal.URI) {
-    // There are two special-cases involving about:blank. One is where
-    // the user has manually loaded it and it got created with a null
-    // principal. The other involves the case where we load
-    // some other empty page in a browser and the current page is the
-    // initial about:blank page (which has that as its principal, not
-    // just URI in which case it could be web-based). Especially in
-    // e10s, we need to tackle that case specifically to avoid race
-    // conditions when updating the URL bar.
-    //
-    // Note that we check the documentURI here, since the currentURI on
-    // the browser might have been set by SessionStore in order to
-    // support switch-to-tab without having actually loaded the content
-    // yet.
-    let uriToCheck = browser.documentURI || uri;
-    if ((uriToCheck.spec == "about:blank" && contentPrincipal.isNullPrincipal) ||
-        contentPrincipal.URI.spec == "about:blank") {
-      return true;
-    }
-    return contentPrincipal.URI.equals(uri);
-  }
-  // ... so for those that don't have them, enforce that the page has the
-  // system principal (this matches e.g. on about:newtab).
-  let ssm = Services.scriptSecurityManager;
-  return ssm.isSystemPrincipal(contentPrincipal);
-}
-
-function BrowserOpenSyncTabs() {
-  gSync.openSyncedTabsPanel();
-}
-
-function ReportFalseDeceptiveSite() {
-  let docURI = gBrowser.selectedBrowser.documentURI;
-  let isPhishingPage =
-    docURI && docURI.spec.startsWith("about:blocked?e=deceptiveBlocked");
-
-  if (isPhishingPage) {
-    let mm = gBrowser.selectedBrowser.messageManager;
-    let onMessage = (message) => {
-      mm.removeMessageListener("DeceptiveBlockedDetails:Result", onMessage);
-      let reportUrl = gSafeBrowsing.getReportURL("PhishMistake", message.data.blockedInfo);
-      if (reportUrl) {
-        openUILinkIn(reportUrl, "tab");
-      } else {
-        let bundle =
-          Services.strings.createBundle("chrome://browser/locale/safebrowsing/safebrowsing.properties");
-        Services.prompt.alert(window,
-                              bundle.GetStringFromName("errorReportFalseDeceptiveTitle"),
-                              bundle.formatStringFromName("errorReportFalseDeceptiveMessage",
-                                                          [message.data.blockedInfo.provider], 1));
-        }
-    };
-    mm.addMessageListener("DeceptiveBlockedDetails:Result", onMessage);
-
-    mm.sendAsyncMessage("DeceptiveBlockedDetails");
-  }
-}
-
-/**
- * Format a URL
- * eg:
- * echo formatURL("https://addons.mozilla.org/%LOCALE%/%APP%/%VERSION%/");
- * > https://addons.mozilla.org/en-US/firefox/3.0a1/
- *
- * Currently supported built-ins are LOCALE, APP, and any value from nsIXULAppInfo, uppercased.
- */
-function formatURL(aFormat, aIsPref) {
-  return aIsPref ? Services.urlFormatter.formatURLPref(aFormat) :
-                   Services.urlFormatter.formatURL(aFormat);
-}
 
 /**
  * Utility object to handle manipulations of the identity indicators in the UI
  */
 var gIdentityHandler = {
   /**
    * nsIURI for which the identity UI is displayed. This has been already
    * processed by nsIURIFixup.createExposableURI.
@@ -8408,942 +1104,8 @@ var gIdentityHandler = {
     });
 
     indicator.appendChild(icon);
     indicator.appendChild(text);
 
     document.getElementById("identity-popup-popup-container").appendChild(indicator);
   },
 };
-
-/**
- * Fired on the "marionette-remote-control" system notification,
- * indicating if the browser session is under remote control.
- */
-const gRemoteControl = {
-  observe(subject, topic, data) {
-    gRemoteControl.updateVisualCue(data);
-  },
-
-  updateVisualCue(enabled) {
-    const mainWindow = document.documentElement;
-    if (enabled) {
-      mainWindow.setAttribute("remotecontrol", "true");
-    } else {
-      mainWindow.removeAttribute("remotecontrol");
-    }
-  },
-};
-
-function getNotificationBox(aWindow) {
-  var foundBrowser = gBrowser.getBrowserForDocument(aWindow.document);
-  if (foundBrowser)
-    return gBrowser.getNotificationBox(foundBrowser);
-  return null;
-}
-
-function getTabModalPromptBox(aWindow) {
-  var foundBrowser = gBrowser.getBrowserForDocument(aWindow.document);
-  if (foundBrowser)
-    return gBrowser.getTabModalPromptBox(foundBrowser);
-  return null;
-}
-
-/* DEPRECATED */
-function getBrowser() {
-  return gBrowser;
-}
-
-const gAccessibilityServiceIndicator = {
-  init() {
-    // Pref to enable accessibility service indicator.
-    Services.prefs.addObserver("accessibility.indicator.enabled", this);
-    // Accessibility service init/shutdown event.
-    Services.obs.addObserver(this, "a11y-init-or-shutdown");
-    this.update(Services.appinfo.accessibilityEnabled);
-  },
-
-  update(accessibilityEnabled = false) {
-    if (this.enabled && accessibilityEnabled) {
-      this._active = true;
-      document.documentElement.setAttribute("accessibilitymode", "true");
-      [...document.querySelectorAll(".accessibility-indicator")].forEach(
-        indicator => ["click", "keypress"].forEach(type =>
-          indicator.addEventListener(type, this)));
-      TabsInTitlebar.update();
-    } else if (this._active) {
-      this._active = false;
-      document.documentElement.removeAttribute("accessibilitymode");
-      [...document.querySelectorAll(".accessibility-indicator")].forEach(
-        indicator => ["click", "keypress"].forEach(type =>
-          indicator.removeEventListener(type, this)));
-      TabsInTitlebar.update();
-    }
-  },
-
-  observe(subject, topic, data) {
-    if (topic == "nsPref:changed" && data === "accessibility.indicator.enabled") {
-      this.update(Services.appinfo.accessibilityEnabled);
-    } else if (topic === "a11y-init-or-shutdown") {
-      // When "a11y-init-or-shutdown" event is fired, "1" indicates that
-      // accessibility service is started and "0" that it is shut down.
-      this.update(data === "1");
-    }
-  },
-
-  get enabled() {
-    return Services.prefs.getBoolPref("accessibility.indicator.enabled");
-  },
-
-  handleEvent({ key, type }) {
-    if ((type === "keypress" && [" ", "Enter"].includes(key)) ||
-         type === "click") {
-      let a11yServicesSupportURL =
-        Services.urlFormatter.formatURLPref("accessibility.support.url");
-      gBrowser.selectedTab = gBrowser.addTab(a11yServicesSupportURL);
-      Services.telemetry.scalarSet("a11y.indicator_acted_on", true);
-    }
-  },
-
-  uninit() {
-    Services.prefs.removeObserver("accessibility.indicator.enabled", this);
-    Services.obs.removeObserver(this, "a11y-init-or-shutdown");
-    this.update();
-  }
-};
-
-var gPrivateBrowsingUI = {
-  init: function PBUI_init() {
-    // Do nothing for normal windows
-    if (!PrivateBrowsingUtils.isWindowPrivate(window)) {
-      return;
-    }
-
-    // Disable the Clear Recent History... menu item when in PB mode
-    // temporary fix until bug 463607 is fixed
-    document.getElementById("Tools:Sanitize").setAttribute("disabled", "true");
-
-    if (window.location.href == getBrowserURL()) {
-      // Adjust the window's title
-      let docElement = document.documentElement;
-      if (!PrivateBrowsingUtils.permanentPrivateBrowsing) {
-        docElement.setAttribute("title",
-          docElement.getAttribute("title_privatebrowsing"));
-        docElement.setAttribute("titlemodifier",
-          docElement.getAttribute("titlemodifier_privatebrowsing"));
-      }
-      docElement.setAttribute("privatebrowsingmode",
-        PrivateBrowsingUtils.permanentPrivateBrowsing ? "permanent" : "temporary");
-      gBrowser.updateTitlebar();
-
-      if (PrivateBrowsingUtils.permanentPrivateBrowsing) {
-        // Adjust the New Window menu entries
-        [
-          { normal: "menu_newNavigator", private: "menu_newPrivateWindow" },
-        ].forEach(function(menu) {
-          let newWindow = document.getElementById(menu.normal);
-          let newPrivateWindow = document.getElementById(menu.private);
-          if (newWindow && newPrivateWindow) {
-            newPrivateWindow.hidden = true;
-            newWindow.label = newPrivateWindow.label;
-            newWindow.accessKey = newPrivateWindow.accessKey;
-            newWindow.command = newPrivateWindow.command;
-          }
-        });
-      }
-    }
-
-    let urlBarSearchParam = gURLBar.getAttribute("autocompletesearchparam") || "";
-    if (!PrivateBrowsingUtils.permanentPrivateBrowsing &&
-        !urlBarSearchParam.includes("disable-private-actions")) {
-      // Disable switch to tab autocompletion for private windows.
-      // We leave it enabled for permanent private browsing mode though.
-      urlBarSearchParam += " disable-private-actions";
-    }
-    if (!urlBarSearchParam.includes("private-window")) {
-      urlBarSearchParam += " private-window";
-    }
-    gURLBar.setAttribute("autocompletesearchparam", urlBarSearchParam);
-  }
-};
-
-/**
- * Switch to a tab that has a given URI, and focuses its browser window.
- * If a matching tab is in this window, it will be switched to. Otherwise, other
- * windows will be searched.
- *
- * @param aURI
- *        URI to search for
- * @param aOpenNew
- *        True to open a new tab and switch to it, if no existing tab is found.
- *        If no suitable window is found, a new one will be opened.
- * @param aOpenParams
- *        If switching to this URI results in us opening a tab, aOpenParams
- *        will be the parameter object that gets passed to openUILinkIn. Please
- *        see the documentation for openUILinkIn to see what parameters can be
- *        passed via this object.
- *        This object also allows:
- *        - 'ignoreFragment' property to be set to true to exclude fragment-portion
- *        matching when comparing URIs.
- *          If set to "whenComparing", the fragment will be unmodified.
- *          If set to "whenComparingAndReplace", the fragment will be replaced.
- *        - 'ignoreQueryString' boolean property to be set to true to exclude query string
- *        matching when comparing URIs.
- *        - 'replaceQueryString' boolean property to be set to true to exclude query string
- *        matching when comparing URIs and overwrite the initial query string with
- *        the one from the new URI.
- *        - 'adoptIntoActiveWindow' boolean property to be set to true to adopt the tab
- *        into the current window.
- * @return True if an existing tab was found, false otherwise
- */
-function switchToTabHavingURI(aURI, aOpenNew, aOpenParams = {}) {
-  // Certain URLs can be switched to irrespective of the source or destination
-  // window being in private browsing mode:
-  const kPrivateBrowsingWhitelist = new Set([
-    "about:addons",
-  ]);
-
-  let ignoreFragment = aOpenParams.ignoreFragment;
-  let ignoreQueryString = aOpenParams.ignoreQueryString;
-  let replaceQueryString = aOpenParams.replaceQueryString;
-  let adoptIntoActiveWindow = aOpenParams.adoptIntoActiveWindow;
-
-  // These properties are only used by switchToTabHavingURI and should
-  // not be used as a parameter for the new load.
-  delete aOpenParams.ignoreFragment;
-  delete aOpenParams.ignoreQueryString;
-  delete aOpenParams.replaceQueryString;
-  delete aOpenParams.adoptIntoActiveWindow;
-
-  let isBrowserWindow = !!window.gBrowser;
-
-  // This will switch to the tab in aWindow having aURI, if present.
-  function switchIfURIInWindow(aWindow) {
-    // Only switch to the tab if neither the source nor the destination window
-    // are private and they are not in permanent private browsing mode
-    if (!kPrivateBrowsingWhitelist.has(aURI.spec) &&
-        (PrivateBrowsingUtils.isWindowPrivate(window) ||
-         PrivateBrowsingUtils.isWindowPrivate(aWindow)) &&
-        !PrivateBrowsingUtils.permanentPrivateBrowsing) {
-      return false;
-    }
-
-    // Remove the query string, fragment, both, or neither from a given url.
-    function cleanURL(url, removeQuery, removeFragment) {
-      let ret = url;
-      if (removeFragment) {
-        ret = ret.split("#")[0];
-        if (removeQuery) {
-          // This removes a query, if present before the fragment.
-          ret = ret.split("?")[0];
-        }
-      } else if (removeQuery) {
-        // This is needed in case there is a fragment after the query.
-        let fragment = ret.split("#")[1];
-        ret = ret.split("?")[0].concat(
-          (fragment != undefined) ? "#".concat(fragment) : "");
-      }
-      return ret;
-    }
-
-    // Need to handle nsSimpleURIs here too (e.g. about:...), which don't
-    // work correctly with URL objects - so treat them as strings
-    let ignoreFragmentWhenComparing = typeof ignoreFragment == "string" &&
-                                      ignoreFragment.startsWith("whenComparing");
-    let requestedCompare = cleanURL(
-          aURI.displaySpec, ignoreQueryString || replaceQueryString, ignoreFragmentWhenComparing);
-    let browsers = aWindow.gBrowser.browsers;
-    for (let i = 0; i < browsers.length; i++) {
-      let browser = browsers[i];
-      let browserCompare = cleanURL(
-          browser.currentURI.displaySpec, ignoreQueryString || replaceQueryString, ignoreFragmentWhenComparing);
-      if (requestedCompare == browserCompare) {
-        // If adoptIntoActiveWindow is set, and this is a cross-window switch,
-        // adopt the tab into the current window, after the active tab.
-        let doAdopt = adoptIntoActiveWindow && isBrowserWindow && aWindow != window;
-
-        if (doAdopt) {
-          window.gBrowser.adoptTab(
-            aWindow.gBrowser.getTabForBrowser(browser),
-            window.gBrowser.tabContainer.selectedIndex + 1,
-            /* aSelectTab = */ true
-          );
-        } else {
-          aWindow.focus();
-        }
-
-        if (ignoreFragment == "whenComparingAndReplace" || replaceQueryString) {
-          browser.loadURI(aURI.spec);
-        }
-
-        if (!doAdopt) {
-          aWindow.gBrowser.tabContainer.selectedIndex = i;
-        }
-
-        return true;
-      }
-    }
-    return false;
-  }
-
-  // This can be passed either nsIURI or a string.
-  if (!(aURI instanceof Ci.nsIURI))
-    aURI = Services.io.newURI(aURI);
-
-  // Prioritise this window.
-  if (isBrowserWindow && switchIfURIInWindow(window))
-    return true;
-
-  for (let browserWin of browserWindows()) {
-    // Skip closed (but not yet destroyed) windows,
-    // and the current window (which was checked earlier).
-    if (browserWin.closed || browserWin == window)
-      continue;
-    if (switchIfURIInWindow(browserWin))
-      return true;
-  }
-
-  // No opened tab has that url.
-  if (aOpenNew) {
-    if (isBrowserWindow && isTabEmpty(gBrowser.selectedTab))
-      openUILinkIn(aURI.spec, "current", aOpenParams);
-    else
-      openUILinkIn(aURI.spec, "tab", aOpenParams);
-  }
-
-  return false;
-}
-
-var RestoreLastSessionObserver = {
-  init() {
-    let browser_tabs_restorebutton_pref = Services.prefs.getIntPref("browser.tabs.restorebutton");
-    Services.telemetry.scalarSet("browser.session.restore.browser_tabs_restorebutton", browser_tabs_restorebutton_pref);
-    Services.telemetry.scalarSet("browser.session.restore.browser_startup_page", Services.prefs.getIntPref("browser.startup.page"));
-    if (SessionStore.canRestoreLastSession &&
-        !PrivateBrowsingUtils.isWindowPrivate(window)) {
-      if (browser_tabs_restorebutton_pref == 1) {
-        let {restoreTabsButton, restoreTabsButtonWrapperWidth} = gBrowser.tabContainer;
-        let restoreTabsButtonWrapper = restoreTabsButton.parentNode;
-        restoreTabsButtonWrapper.setAttribute("session-exists", "true");
-        gBrowser.tabContainer.updateSessionRestoreVisibility();
-        restoreTabsButton.style.maxWidth = `${restoreTabsButtonWrapperWidth}px`;
-        gBrowser.tabContainer.addEventListener("TabOpen", this);
-        Services.telemetry.scalarSet("browser.session.restore.tabbar_restore_available", true);
-        restoreTabsButton.addEventListener("click", () => {
-          Services.telemetry.scalarSet("browser.session.restore.tabbar_restore_clicked", true);
-        });
-      }
-      Services.obs.addObserver(this, "sessionstore-last-session-cleared", true);
-      goSetCommandEnabled("Browser:RestoreLastSession", true);
-    } else if (SessionStartup.isAutomaticRestoreEnabled()) {
-      document.getElementById("Browser:RestoreLastSession").setAttribute("hidden", true);
-    }
-  },
-
-  handleEvent(event) {
-    switch (event.type) {
-     case "TabOpen":
-        this.removeRestoreButton();
-        break;
-    }
-  },
-
-  removeRestoreButton() {
-    let {restoreTabsButton} = gBrowser.tabContainer;
-    let restoreTabsButtonWrapper = restoreTabsButton.parentNode;
-    gBrowser.tabContainer.addEventListener("transitionend", function maxWidthTransitionHandler(e) {
-      if (e.target == gBrowser.tabContainer && e.propertyName == "max-width") {
-        gBrowser.tabContainer.updateSessionRestoreVisibility();
-        gBrowser.tabContainer.removeEventListener("transitionend", maxWidthTransitionHandler);
-      }
-    });
-    restoreTabsButtonWrapper.removeAttribute("session-exists");
-    restoreTabsButton.style.maxWidth = 0;
-    gBrowser.tabContainer.removeEventListener("TabOpen", this);
-  },
-
-  observe() {
-    // The last session can only be restored once so there's
-    // no way we need to re-enable our menu item.
-    Services.obs.removeObserver(this, "sessionstore-last-session-cleared");
-    goSetCommandEnabled("Browser:RestoreLastSession", false);
-    this.removeRestoreButton();
-  },
-
-  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
-                                         Ci.nsISupportsWeakReference])
-};
-
-function restoreLastSession() {
-  SessionStore.restoreLastSession();
-}
-
-/* Observes menus and adjusts their size for better
- * usability when opened via a touch screen. */
-var MenuTouchModeObserver = {
-  init() {
-    window.addEventListener("popupshowing", this, true);
-  },
-
-  handleEvent(event) {
-    let target = event.originalTarget;
-    if (event.mozInputSource == MouseEvent.MOZ_SOURCE_TOUCH) {
-      target.setAttribute("touchmode", "true");
-    } else {
-      target.removeAttribute("touchmode");
-    }
-  },
-
-  uninit() {
-    window.removeEventListener("popupshowing", this, true);
-  },
-};
-
-var TabContextMenu = {
-  contextTab: null,
-  _updateToggleMuteMenuItem(aTab, aConditionFn) {
-    ["muted", "soundplaying"].forEach(attr => {
-      if (!aConditionFn || aConditionFn(attr)) {
-        if (aTab.hasAttribute(attr)) {
-          aTab.toggleMuteMenuItem.setAttribute(attr, "true");
-        } else {
-          aTab.toggleMuteMenuItem.removeAttribute(attr);
-        }
-      }
-    });
-  },
-  updateContextMenu: function updateContextMenu(aPopupMenu) {
-    this.contextTab = aPopupMenu.triggerNode.localName == "tab" ?
-                      aPopupMenu.triggerNode : gBrowser.selectedTab;
-    let disabled = gBrowser.tabs.length == 1;
-
-    var menuItems = aPopupMenu.getElementsByAttribute("tbattr", "tabbrowser-multiple");
-    for (let menuItem of menuItems)
-      menuItem.disabled = disabled;
-
-    if (this.contextTab.hasAttribute("customizemode"))
-      document.getElementById("context_openTabInWindow").disabled = true;
-
-    disabled = gBrowser.visibleTabs.length == 1;
-    menuItems = aPopupMenu.getElementsByAttribute("tbattr", "tabbrowser-multiple-visible");
-    for (let menuItem of menuItems)
-      menuItem.disabled = disabled;
-
-    // Session store
-    document.getElementById("context_undoCloseTab").disabled =
-      SessionStore.getClosedTabCount(window) == 0;
-
-    // Only one of pin/unpin should be visible
-    document.getElementById("context_pinTab").hidden = this.contextTab.pinned;
-    document.getElementById("context_unpinTab").hidden = !this.contextTab.pinned;
-
-    // Disable "Close Tabs to the Right" if there are no tabs
-    // following it.
-    document.getElementById("context_closeTabsToTheEnd").disabled =
-      gBrowser.getTabsToTheEndFrom(this.contextTab).length == 0;
-
-    // Disable "Close other Tabs" if there are no unpinned tabs.
-    let unpinnedTabsToClose = gBrowser.visibleTabs.length - gBrowser._numPinnedTabs;
-    if (!this.contextTab.pinned) {
-      unpinnedTabsToClose--;
-    }
-    document.getElementById("context_closeOtherTabs").disabled = unpinnedTabsToClose < 1;
-
-    // Hide "Bookmark All Tabs" for a pinned tab.  Update its state if visible.
-    let bookmarkAllTabs = document.getElementById("context_bookmarkAllTabs");
-    bookmarkAllTabs.hidden = this.contextTab.pinned;
-    if (!bookmarkAllTabs.hidden)
-      PlacesCommandHook.updateBookmarkAllTabsCommand();
-
-    // Adjust the state of the toggle mute menu item.
-    let toggleMute = document.getElementById("context_toggleMuteTab");
-    if (this.contextTab.hasAttribute("activemedia-blocked")) {
-      toggleMute.label = gNavigatorBundle.getString("playTab.label");
-      toggleMute.accessKey = gNavigatorBundle.getString("playTab.accesskey");
-    } else if (this.contextTab.hasAttribute("muted")) {
-      toggleMute.label = gNavigatorBundle.getString("unmuteTab.label");
-      toggleMute.accessKey = gNavigatorBundle.getString("unmuteTab.accesskey");
-    } else {
-      toggleMute.label = gNavigatorBundle.getString("muteTab.label");
-      toggleMute.accessKey = gNavigatorBundle.getString("muteTab.accesskey");
-    }
-
-    this.contextTab.toggleMuteMenuItem = toggleMute;
-    this._updateToggleMuteMenuItem(this.contextTab);
-
-    this.contextTab.addEventListener("TabAttrModified", this);
-    aPopupMenu.addEventListener("popuphiding", this);
-
-    gSync.updateTabContextMenu(aPopupMenu, this.contextTab);
-  },
-  handleEvent(aEvent) {
-    switch (aEvent.type) {
-      case "popuphiding":
-        gBrowser.removeEventListener("TabAttrModified", this);
-        aEvent.target.removeEventListener("popuphiding", this);
-        break;
-      case "TabAttrModified":
-        let tab = aEvent.target;
-        this._updateToggleMuteMenuItem(tab,
-          attr => aEvent.detail.changed.includes(attr));
-        break;
-    }
-  }
-};
-
-// Prompt user to restart the browser in safe mode
-function safeModeRestart() {
-  if (Services.appinfo.inSafeMode) {
-    let cancelQuit = Cc["@mozilla.org/supports-PRBool;1"].
-                     createInstance(Ci.nsISupportsPRBool);
-    Services.obs.notifyObservers(cancelQuit, "quit-application-requested", "restart");
-
-    if (cancelQuit.data)
-      return;
-
-    Services.startup.quit(Ci.nsIAppStartup.eRestart | Ci.nsIAppStartup.eAttemptQuit);
-    return;
-  }
-
-  Services.obs.notifyObservers(null, "restart-in-safe-mode");
-}
-
-/* duplicateTabIn duplicates tab in a place specified by the parameter |where|.
- *
- * |where| can be:
- *  "tab"         new tab
- *  "tabshifted"  same as "tab" but in background if default is to select new
- *                tabs, and vice versa
- *  "window"      new window
- *
- * delta is the offset to the history entry that you want to load.
- */
-function duplicateTabIn(aTab, where, delta) {
-  switch (where) {
-    case "window":
-      let otherWin = OpenBrowserWindow();
-      let delayedStartupFinished = (subject, topic) => {
-        if (topic == "browser-delayed-startup-finished" &&
-            subject == otherWin) {
-          Services.obs.removeObserver(delayedStartupFinished, topic);
-          let otherGBrowser = otherWin.gBrowser;
-          let otherTab = otherGBrowser.selectedTab;
-          SessionStore.duplicateTab(otherWin, aTab, delta);
-          otherGBrowser.removeTab(otherTab, { animate: false });
-        }
-      };
-
-      Services.obs.addObserver(delayedStartupFinished,
-                               "browser-delayed-startup-finished");
-      break;
-    case "tabshifted":
-      SessionStore.duplicateTab(window, aTab, delta);
-      // A background tab has been opened, nothing else to do here.
-      break;
-    case "tab":
-      let newTab = SessionStore.duplicateTab(window, aTab, delta);
-      gBrowser.selectedTab = newTab;
-      break;
-  }
-}
-
-var MousePosTracker = {
-  _listeners: new Set(),
-  _x: 0,
-  _y: 0,
-  get _windowUtils() {
-    delete this._windowUtils;
-    return this._windowUtils = window.getInterface(Ci.nsIDOMWindowUtils);
-  },
-
-  addListener(listener) {
-    if (this._listeners.has(listener))
-      return;
-
-    listener._hover = false;
-    this._listeners.add(listener);
-
-    this._callListener(listener);
-  },
-
-  removeListener(listener) {
-    this._listeners.delete(listener);
-  },
-
-  handleEvent(event) {
-    var fullZoom = this._windowUtils.fullZoom;
-    this._x = event.screenX / fullZoom - window.mozInnerScreenX;
-    this._y = event.screenY / fullZoom - window.mozInnerScreenY;
-
-    this._listeners.forEach(function(listener) {
-      try {
-        this._callListener(listener);
-      } catch (e) {
-        Cu.reportError(e);
-      }
-    }, this);
-  },
-
-  _callListener(listener) {
-    let rect = listener.getMouseTargetRect();
-    let hover = this._x >= rect.left &&
-                this._x <= rect.right &&
-                this._y >= rect.top &&
-                this._y <= rect.bottom;
-
-    if (hover == listener._hover)
-      return;
-
-    listener._hover = hover;
-
-    if (hover) {
-      if (listener.onMouseEnter)
-        listener.onMouseEnter();
-    } else if (listener.onMouseLeave) {
-      listener.onMouseLeave();
-    }
-  }
-};
-
-var ToolbarIconColor = {
-  _windowState: {
-    "active": false,
-    "fullscreen": false,
-    "tabsintitlebar": false
-  },
-  init() {
-    this._initialized = true;
-
-    window.addEventListener("activate", this);
-    window.addEventListener("deactivate", this);
-    window.addEventListener("toolbarvisibilitychange", this);
-    Services.obs.addObserver(this, "lightweight-theme-styling-update");
-
-    // If the window isn't active now, we assume that it has never been active
-    // before and will soon become active such that inferFromText will be
-    // called from the initial activate event.
-    if (Services.focus.activeWindow == window) {
-      this.inferFromText("activate");
-    }
-  },
-
-  uninit() {
-    this._initialized = false;
-
-    window.removeEventListener("activate", this);
-    window.removeEventListener("deactivate", this);
-    window.removeEventListener("toolbarvisibilitychange", this);
-    Services.obs.removeObserver(this, "lightweight-theme-styling-update");
-  },
-
-  handleEvent(event) {
-    switch (event.type) {
-      case "activate": // falls through
-      case "deactivate":
-        this.inferFromText(event.type);
-        break;
-      case "toolbarvisibilitychange":
-        this.inferFromText(event.type, event.visible);
-        break;
-    }
-  },
-
-  observe(aSubject, aTopic, aData) {
-    switch (aTopic) {
-      case "lightweight-theme-styling-update":
-        // inferFromText needs to run after LightweightThemeConsumer.jsm's
-        // lightweight-theme-styling-update observer.
-        setTimeout(() => {
-          this.inferFromText(aTopic);
-        }, 0);
-        break;
-    }
-  },
-
-  // a cache of luminance values for each toolbar
-  // to avoid unnecessary calls to getComputedStyle
-  _toolbarLuminanceCache: new Map(),
-
-  inferFromText(reason, reasonValue) {
-    if (!this._initialized)
-      return;
-    function parseRGB(aColorString) {
-      let rgb = aColorString.match(/^rgba?\((\d+), (\d+), (\d+)/);
-      rgb.shift();
-      return rgb.map(x => parseInt(x));
-    }
-
-    switch (reason) {
-      case "activate": // falls through
-      case "deactivate":
-        this._windowState.active = (reason === "activate");
-        break;
-      case "fullscreen":
-        this._windowState.fullscreen = reasonValue;
-        break;
-      case "lightweight-theme-styling-update":
-        // theme change, we'll need to recalculate all color values
-        this._toolbarLuminanceCache.clear();
-        break;
-      case "toolbarvisibilitychange":
-        // toolbar changes dont require reset of the cached color values
-        break;
-      case "tabsintitlebar":
-        this._windowState.tabsintitlebar = reasonValue;
-        break;
-    }
-
-    let toolbarSelector = "#navigator-toolbox > toolbar:not([collapsed=true])";
-    if (AppConstants.platform == "macosx")
-      toolbarSelector += ":not([type=menubar])";
-
-    // The getComputedStyle calls and setting the brighttext are separated in
-    // two loops to avoid flushing layout and making it dirty repeatedly.
-    let cachedLuminances = this._toolbarLuminanceCache;
-    let luminances = new Map();
-    for (let toolbar of document.querySelectorAll(toolbarSelector)) {
-      // toolbars *should* all have ids, but guard anyway to avoid blowing up
-      let cacheKey = toolbar.id && toolbar.id + JSON.stringify(this._windowState);
-      // lookup cached luminance value for this toolbar in this window state
-      let luminance = cacheKey && cachedLuminances.get(cacheKey);
-      if (isNaN(luminance)) {
-        let [r, g, b] = parseRGB(getComputedStyle(toolbar).color);
-        luminance = 0.2125 * r + 0.7154 * g + 0.0721 * b;
-        if (cacheKey) {
-          cachedLuminances.set(cacheKey, luminance);
-        }
-      }
-      luminances.set(toolbar, luminance);
-    }
-
-    for (let [toolbar, luminance] of luminances) {
-      if (luminance <= 110)
-        toolbar.removeAttribute("brighttext");
-      else
-        toolbar.setAttribute("brighttext", "true");
-    }
-  }
-};
-
-var PanicButtonNotifier = {
-  init() {
-    this._initialized = true;
-    if (window.PanicButtonNotifierShouldNotify) {
-      delete window.PanicButtonNotifierShouldNotify;
-      this.notify();
-    }
-  },
-  notify() {
-    if (!this._initialized) {
-      window.PanicButtonNotifierShouldNotify = true;
-      return;
-    }
-    // Display notification panel here...
-    try {
-      let popup = document.getElementById("panic-button-success-notification");
-      popup.hidden = false;
-      // To close the popup in 3 seconds after the popup is shown but left uninteracted.
-      let onTimeout = () => {
-        PanicButtonNotifier.close();
-        removeListeners();
-      };
-      popup.addEventListener("popupshown", function() {
-        PanicButtonNotifier.timer = setTimeout(onTimeout, 3000);
-      });
-      // To prevent the popup from closing when user tries to interact with the
-      // popup using mouse or keyboard.
-      let onUserInteractsWithPopup = () => {
-        clearTimeout(PanicButtonNotifier.timer);
-        removeListeners();
-       };
-      popup.addEventListener("mouseover", onUserInteractsWithPopup);
-      window.addEventListener("keydown", onUserInteractsWithPopup);
-      let removeListeners = () => {
-        popup.removeEventListener("mouseover", onUserInteractsWithPopup);
-        window.removeEventListener("keydown", onUserInteractsWithPopup);
-        popup.removeEventListener("popuphidden", removeListeners);
-      };
-      popup.addEventListener("popuphidden", removeListeners);
-
-      let widget = CustomizableUI.getWidget("panic-button").forWindow(window);
-      let anchor = widget.anchor;
-      anchor = document.getAnonymousElementByAttribute(anchor, "class", "toolbarbutton-icon");
-      popup.openPopup(anchor, popup.getAttribute("position"));
-    } catch (ex) {
-      Cu.reportError(ex);
-    }
-  },
-  close() {
-    let popup = document.getElementById("panic-button-success-notification");
-    popup.hidePopup();
-  },
-};
-
-var AboutCapabilitiesListener = {
-  _topics: [
-    "AboutCapabilities:OpenPrivateWindow",
-    "AboutCapabilities:DontShowIntroPanelAgain",
-  ],
-
-  init() {
-    let mm = window.messageManager;
-    for (let topic of this._topics) {
-      mm.addMessageListener(topic, this);
-    }
-  },
-
-  uninit() {
-    let mm = window.messageManager;
-    for (let topic of this._topics) {
-      mm.removeMessageListener(topic, this);
-    }
-  },
-
-  receiveMessage(aMsg) {
-    switch (aMsg.name) {
-      case "AboutCapabilities:OpenPrivateWindow":
-        OpenBrowserWindow({private: true});
-        break;
-
-      case "AboutCapabilities:DontShowIntroPanelAgain":
-        TrackingProtection.dontShowIntroPanelAgain();
-        break;
-    }
-  },
-};
-
-const SafeBrowsingNotificationBox = {
-  _currentURIBaseDomain: null,
-  show(title, buttons) {
-    let uri = gBrowser.currentURI;
-
-    // start tracking host so that we know when we leave the domain
-    this._currentURIBaseDomain = Services.eTLD.getBaseDomain(uri);
-
-    let notificationBox = gBrowser.getNotificationBox();
-    let value = "blocked-badware-page";
-
-    let previousNotification = notificationBox.getNotificationWithValue(value);
-    if (previousNotification) {
-      notificationBox.removeNotification(previousNotification);
-    }
-
-    let notification = notificationBox.appendNotification(
-      title,
-      value,
-      "chrome://global/skin/icons/blacklist_favicon.png",
-      notificationBox.PRIORITY_CRITICAL_HIGH,
-      buttons
-    );
-    // Persist the notification until the user removes so it
-    // doesn't get removed on redirects.
-    notification.persistence = -1;
-  },
-  onLocationChange(aLocationURI) {
-    // take this to represent that you haven't visited a bad place
-    if (!this._currentURIBaseDomain) {
-      return;
-    }
-
-    let newURIBaseDomain = Services.eTLD.getBaseDomain(aLocationURI);
-
-    if (newURIBaseDomain !== this._currentURIBaseDomain) {
-      let notificationBox = gBrowser.getNotificationBox();
-      let notification = notificationBox.getNotificationWithValue("blocked-badware-page");
-      if (notification) {
-        notificationBox.removeNotification(notification, false);
-      }
-
-      this._currentURIBaseDomain = null;
-    }
-  }
-};
-
-function TabModalPromptBox(browser) {
-  this._weakBrowserRef = Cu.getWeakReference(browser);
-}
-
-TabModalPromptBox.prototype = {
-  _promptCloseCallback(onCloseCallback, principalToAllowFocusFor, allowFocusCheckbox, ...args) {
-    if (principalToAllowFocusFor && allowFocusCheckbox &&
-        allowFocusCheckbox.checked) {
-      Services.perms.addFromPrincipal(principalToAllowFocusFor, "focus-tab-by-prompt",
-                                      Services.perms.ALLOW_ACTION);
-    }
-    onCloseCallback.apply(this, args);
-  },
-
-  appendPrompt(args, onCloseCallback) {
-    const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
-    let newPrompt = document.createElementNS(XUL_NS, "tabmodalprompt");
-    let browser = this.browser;
-    browser.parentNode.insertBefore(newPrompt, browser.nextSibling);
-    browser.setAttribute("tabmodalPromptShowing", true);
-
-    newPrompt.clientTop; // style flush to assure binding is attached
-
-    let prompts = this.listPrompts();
-    if (prompts.length > 1) {
-      // Let's hide ourself behind the current prompt.
-      newPrompt.hidden = true;
-    }
-
-    let principalToAllowFocusFor = this._allowTabFocusByPromptPrincipal;
-    delete this._allowTabFocusByPromptPrincipal;
-
-    let allowFocusCheckbox; // Define outside the if block so we can bind it into the callback.
-    let hostForAllowFocusCheckbox = "";
-    try {
-      hostForAllowFocusCheckbox = principalToAllowFocusFor.URI.host;
-    } catch (ex) { /* Ignore exceptions for host-less URIs */ }
-    if (hostForAllowFocusCheckbox) {
-      let allowFocusRow = document.createElementNS(XUL_NS, "row");
-      allowFocusCheckbox = document.createElementNS(XUL_NS, "checkbox");
-      let spacer = document.createElementNS(XUL_NS, "spacer");
-      allowFocusRow.appendChild(spacer);
-      let label = gTabBrowserBundle.formatStringFromName("tabs.allowTabFocusByPromptForSite",
-                                                      [hostForAllowFocusCheckbox], 1);
-      allowFocusCheckbox.setAttribute("label", label);
-      allowFocusRow.appendChild(allowFocusCheckbox);
-      newPrompt.appendChild(allowFocusRow);
-    }
-
-    let tab = gBrowser.getTabForBrowser(browser);
-    let closeCB = this._promptCloseCallback.bind(null, onCloseCallback, principalToAllowFocusFor,
-                                                 allowFocusCheckbox);
-    newPrompt.init(args, tab, closeCB);
-    return newPrompt;
-  },
-
-  removePrompt(aPrompt) {
-    let browser = this.browser;
-    browser.parentNode.removeChild(aPrompt);
-
-    let prompts = this.listPrompts();
-    if (prompts.length) {
-      let prompt = prompts[prompts.length - 1];
-      prompt.hidden = false;
-      prompt.Dialog.setDefaultFocus();
-    } else {
-      browser.removeAttribute("tabmodalPromptShowing");
-      browser.focus();
-    }
-  },
-
-  listPrompts(aPrompt) {
-    // Get the nodelist, then return as an array
-    const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
-    let els = this.browser.parentNode.getElementsByTagNameNS(XUL_NS, "tabmodalprompt");
-    return Array.from(els);
-  },
-
-  onNextPromptShowAllowFocusCheckboxFor(principal) {
-    this._allowTabFocusByPromptPrincipal = principal;
-  },
-
-  get browser() {
-    let browser = this._weakBrowserRef.get();
-    if (!browser) {
-      throw "Stale promptbox! The associated browser is gone.";
-    }
-    return browser;
-  },
-};
--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -1212,18 +1212,22 @@
       <splitter id="sidebar-splitter" class="chromeclass-extrachrome sidebar-splitter" hidden="true"/>
       <vbox id="appcontent" flex="1">
         <notificationbox id="high-priority-global-notificationbox" notificationside="top"/>
         <tabbox id="tabbrowser-tabbox"
                     flex="1" eventnode="document" tabcontainer="tabbrowser-tabs"
                     onselect="if (event.target.localName == 'tabpanels') gBrowser.updateCurrentBrowser();">
           <tabpanels flex="1" class="plain" selectedIndex="0" id="tabbrowser-tabpanels">
             <notificationbox flex="1" notificationside="top">
-              <hbox flex="1" class="browserSidebarContainer">
-                <vbox flex="1" class="browserContainer">
+              <!-- Set large flex to allow the devtools toolbox to set a flex attribute.
+                   We don't want the toolbox to actually take up free space, but we do want it to collapse when the window shrinks, and with flex=0 it can't.
+                   When the toolbox is on the bottom it's a sibling of browserSidebarContainer,
+                   and when it's on the side it's a sibling of browserContainer.  -->
+              <hbox flex="10000" class="browserSidebarContainer">
+                <vbox flex="10000" class="browserContainer">
                   <stack flex="1" class="browserStack">
                     <browser id="tabbrowser-initialBrowser" type="content"
                              message="true" messagemanagergroup="browsers"
                              primary="true" blank="true"
                              tooltip="aHTMLTooltip"
                              contextmenu="contentAreaContextMenu"
                              autocompletepopup="PopupAutoComplete"
                              selectmenulist="ContentSelectDropdown"
--- a/browser/base/content/global-scripts.inc
+++ b/browser/base/content/global-scripts.inc
@@ -16,16 +16,17 @@ for (let script of [
   "chrome://browser/content/browser-captivePortal.js",
   "chrome://browser/content/browser-compacttheme.js",
   "chrome://browser/content/browser-feeds.js",
   "chrome://browser/content/browser-media.js",
   "chrome://browser/content/browser-pageActions.js",
   "chrome://browser/content/browser-places.js",
   "chrome://browser/content/browser-plugins.js",
   "chrome://browser/content/browser-sidebar.js",
+  "chrome://browser/content/browser-siteIdentity.js",
   "chrome://browser/content/browser-tabsintitlebar.js",
   "chrome://browser/content/browser-trackingprotection.js",
 
   "chrome://global/content/globalOverlay.js",
   "chrome://browser/content/utilityOverlay.js",
 #ifdef XP_MACOSX
   "chrome://global/content/macWindowMenu.js",
 #endif
--- a/browser/base/content/tabbrowser.js
+++ b/browser/base/content/tabbrowser.js
@@ -1863,23 +1863,23 @@ window._gBrowser = {
     stack.className = "browserStack";
     stack.appendChild(b);
     stack.setAttribute("flex", "1");
 
     // Create the browserContainer
     let browserContainer = document.createElementNS(this._XUL_NS, "vbox");
     browserContainer.className = "browserContainer";
     browserContainer.appendChild(stack);
-    browserContainer.setAttribute("flex", "1");
+    browserContainer.setAttribute("flex", "10000");
 
     // Create the sidebar container
     let browserSidebarContainer = document.createElementNS(this._XUL_NS, "hbox");
     browserSidebarContainer.className = "browserSidebarContainer";
     browserSidebarContainer.appendChild(browserContainer);
-    browserSidebarContainer.setAttribute("flex", "1");
+    browserSidebarContainer.setAttribute("flex", "10000");
 
     // Add the Message and the Browser to the box
     let notificationbox = document.createElementNS(this._XUL_NS, "notificationbox");
     notificationbox.setAttribute("flex", "1");
     notificationbox.setAttribute("notificationside", "top");
     notificationbox.appendChild(browserSidebarContainer);
 
     // Prevent the superfluous initial load of a blank document
--- a/browser/base/jar.mn
+++ b/browser/base/jar.mn
@@ -61,16 +61,17 @@ browser.jar:
         content/browser/browser-fullZoom.js           (content/browser-fullZoom.js)
         content/browser/browser-gestureSupport.js     (content/browser-gestureSupport.js)
         content/browser/browser-media.js              (content/browser-media.js)
         content/browser/browser-pageActions.js        (content/browser-pageActions.js)
         content/browser/browser-places.js             (content/browser-places.js)
         content/browser/browser-plugins.js            (content/browser-plugins.js)
         content/browser/browser-safebrowsing.js       (content/browser-safebrowsing.js)
         content/browser/browser-sidebar.js            (content/browser-sidebar.js)
+        content/browser/browser-siteIdentity.js       (content/browser-siteIdentity.js)
         content/browser/browser-sync.js               (content/browser-sync.js)
 *       content/browser/browser-tabPreviews.xml       (content/browser-tabPreviews.xml)
         content/browser/browser-tabsintitlebar.js       (content/browser-tabsintitlebar.js)
         content/browser/browser-thumbnails.js         (content/browser-thumbnails.js)
         content/browser/browser-trackingprotection.js (content/browser-trackingprotection.js)
         content/browser/browser-webrender.js          (content/browser-webrender.js)
         content/browser/tab-content.js                (content/tab-content.js)
         content/browser/content.js                    (content/content.js)
--- a/browser/components/enterprisepolicies/Policies.jsm
+++ b/browser/components/enterprisepolicies/Policies.jsm
@@ -286,16 +286,25 @@ var Policies = {
       if (param) {
         manager.disallowFeature("privatebrowsing");
         manager.disallowFeature("about:privatebrowsing", true);
         setAndLockPref("browser.privatebrowsing.autostart", false);
       }
     }
   },
 
+  "DisableProfileRefresh": {
+    onBeforeUIStartup(manager, param) {
+      if (param) {
+        manager.disallowFeature("profileRefresh");
+        setAndLockPref("browser.disableResetPrompt", true);
+      }
+    }
+  },
+
   "DisableSafeMode": {
     onBeforeUIStartup(manager, param) {
       if (param) {
         manager.disallowFeature("safeMode");
       }
     }
   },
 
--- a/browser/components/enterprisepolicies/schemas/policies-schema.json
+++ b/browser/components/enterprisepolicies/schemas/policies-schema.json
@@ -229,16 +229,23 @@
 
     "DisablePrivateBrowsing": {
       "description": "Disables private browsing.",
       "first_available": "60.0",
 
       "type": "boolean"
     },
 
+    "DisableProfileRefresh": {
+      "description": "Disables the \"Refresh Firefox\" button in about:support",
+      "first_available": "60.0",
+
+      "type": "boolean"
+    },
+
     "DisableSafeMode": {
       "description": "Prevents ability to restart in safe mode.",
       "first_available": "60.0",
 
       "type": "boolean"
     },
 
     "DisableSecurityBypass": {
--- a/browser/components/enterprisepolicies/tests/EnterprisePolicyTesting.jsm
+++ b/browser/components/enterprisepolicies/tests/EnterprisePolicyTesting.jsm
@@ -102,16 +102,18 @@ var PoliciesPrefTracker = {
     // If this pref is seen multiple times, the very first
     // value seen is the one that is actually the default.
     if (!this._originalValues.has(prefName)) {
       let defaults = new Preferences({defaultBranch: true});
       let stored = {};
 
       if (defaults.has(prefName)) {
         stored.originalDefaultValue = defaults.get(prefName);
+      } else {
+        stored.originalDefaultValue = undefined;
       }
 
       if (Preferences.isSet(prefName) &&
           Preferences.get(prefName) == prefValue) {
         // If a user value exists, and we're changing the default
         // value to be th same as the user value, that will cause
         // the user value to be dropped. In that case, let's also
         // store it to ensure that we restore everything correctly.
@@ -132,16 +134,18 @@ var PoliciesPrefTracker = {
     for (let [prefName, stored] of this._originalValues) {
       // If a pref was used through setDefaultPref instead
       // of setAndLockPref, it wasn't locked, but calling
       // unlockPref is harmless
       Preferences.unlock(prefName);
 
       if (stored.originalDefaultValue !== undefined) {
         defaults.set(prefName, stored.originalDefaultValue);
+      } else {
+        Services.prefs.getDefaultBranch("").deleteBranch(prefName);
       }
 
       if (stored.originalUserValue !== undefined) {
         Preferences.set(prefName, stored.originalUserValue);
       }
     }
 
     this._originalValues.clear();
--- a/browser/components/enterprisepolicies/tests/browser/browser.ini
+++ b/browser/components/enterprisepolicies/tests/browser/browser.ini
@@ -32,16 +32,17 @@ support-files =
 [browser_policy_disable_feedback_commands.js]
 [browser_policy_disable_flash_plugin.js]
 [browser_policy_disable_fxaccounts.js]
 [browser_policy_disable_masterpassword.js]
 [browser_policy_disable_pdfjs.js]
 [browser_policy_disable_pocket.js]
 [browser_policy_disable_popup_blocker.js]
 [browser_policy_disable_privatebrowsing.js]
+[browser_policy_disable_profile_reset.js]
 [browser_policy_disable_safemode.js]
 [browser_policy_disable_shield.js]
 [browser_policy_disable_telemetry.js]
 [browser_policy_display_bookmarks.js]
 [browser_policy_display_menu.js]
 [browser_policy_extensions.js]
 [browser_policy_override_postupdatepage.js]
 [browser_policy_proxy.js]
--- a/browser/components/enterprisepolicies/tests/browser/browser_policies_setAndLockPref_API.js
+++ b/browser/components/enterprisepolicies/tests/browser/browser_policies_setAndLockPref_API.js
@@ -117,22 +117,26 @@ add_task(async function test_pref_tracke
   let defaults = Services.prefs.getDefaultBranch("");
 
   // Test prefs that had a default value and got changed to another
   defaults.setIntPref("test1.pref1", 10);
   defaults.setStringPref("test1.pref2", "test");
 
   setAndLockPref("test1.pref1", 20);
   setDefaultPref("test1.pref2", "NEW VALUE");
+  setAndLockPref("test1.pref3", "NEW VALUE");
+  setDefaultPref("test1.pref4", 20);
 
   PoliciesPrefTracker.restoreDefaultValues();
 
   is(Services.prefs.getIntPref("test1.pref1"), 10, "Expected value for test1.pref1");
   is(Services.prefs.getStringPref("test1.pref2"), "test", "Expected value for test1.pref2");
   is(Services.prefs.prefIsLocked("test1.pref1"), false, "test1.pref1 got unlocked");
+  is(Services.prefs.getStringPref("test1.pref3", undefined), undefined, "test1.pref3 should have had its value unset");
+  is(Services.prefs.getIntPref("test1.pref4", -1), -1, "test1.pref4 should have had its value unset");
 
   // Test a pref that had a default value and a user value
   defaults.setIntPref("test2.pref1", 10);
   Services.prefs.setIntPref("test2.pref1", 20);
 
   setAndLockPref("test2.pref1", 20);
 
   PoliciesPrefTracker.restoreDefaultValues();
new file mode 100644
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/browser_policy_disable_profile_reset.js
@@ -0,0 +1,53 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+let {ResetProfile} = ChromeUtils.import("resource://gre/modules/ResetProfile.jsm", {});
+
+// For this test to work properly, this profile actually needs to be
+// "reset-able", which requires that it be recognized by the profile service
+add_task(async function setup() {
+  let profileDirectory = Services.dirsvc.get("ProfD", Ci.nsIFile);
+  let profileName = profileDirectory.leafName;
+  let profileService = Cc["@mozilla.org/toolkit/profile-service;1"].
+                       getService(Ci.nsIToolkitProfileService);
+  let createdProfile = profileService.createProfile(profileDirectory, profileName);
+  profileService.flush();
+  registerCleanupFunction(async function cleanup() {
+    // Pass false to remove it from the profile service without deleting files.
+    createdProfile.remove(false);
+  });
+});
+
+async function test_reset_disabled({disabled}) {
+  is(ResetProfile.resetSupported(), !disabled,
+     "Reset should only be supported if policy has not been applied");
+  is(Services.prefs.getBoolPref("browser.disableResetPrompt", undefined),
+     disabled, "Reset prompt should only be shown if policy has not been applied");
+  is(Services.prefs.prefIsLocked("browser.disableResetPrompt"), disabled,
+     "Reset prompt pref should be locked if the policy has been applied");
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, "about:support");
+  // eslint-disable-next-line no-shadow
+  await ContentTask.spawn(tab.linkedBrowser, {disabled}, async function({disabled}) {
+    let resetBox = content.document.getElementById("reset-box");
+    let elementStyle = content.window.getComputedStyle(resetBox);
+    let expectedDisplayValue = disabled ? "none" : "block";
+    is(elementStyle.display, expectedDisplayValue,
+       "about:support Reset button box should be hidden");
+  });
+  await BrowserTestUtils.removeTab(tab);
+}
+
+add_task(async function test_initial_conditions() {
+  await test_reset_disabled({disabled: false});
+});
+
+add_task(async function test_policy_disable_reset() {
+  await setupPolicyEngineWithJson({
+    "policies": {
+      "DisableProfileRefresh": true
+    }
+  });
+  await test_reset_disabled({disabled: true});
+});
--- a/browser/components/extensions/parent/ext-menus.js
+++ b/browser/components/extensions/parent/ext-menus.js
@@ -269,17 +269,16 @@ var gMenuBuilder = {
         // Select the clicked radio item.
         item.checked = true;
       }
 
       if (!contextData.onBookmark) {
         item.tabManager.addActiveTabPermission();
       }
 
-      let tab = contextData.tab && item.tabManager.convert(contextData.tab);
       let info = item.getClickInfo(contextData, wasChecked);
 
       const map = {shiftKey: "Shift", altKey: "Alt", metaKey: "Command", ctrlKey: "Ctrl"};
       info.modifiers = Object.keys(map).filter(key => event[key]).map(key => map[key]);
       if (event.ctrlKey && AppConstants.platform === "macosx") {
         info.modifiers.push("MacCtrl");
       }
 
@@ -290,17 +289,17 @@ var gMenuBuilder = {
         _execute_browser_action: global.browserActionFor,
         _execute_sidebar_action: global.sidebarActionFor,
       }[item.command];
       if (actionFor) {
         let win = event.target.ownerGlobal;
         actionFor(item.extension).triggerAction(win);
       }
 
-      item.extension.emit("webext-menu-menuitem-click", info, tab);
+      item.extension.emit("webext-menu-menuitem-click", info, contextData.tab);
     });
 
     // Don't publish the ID of the root because the root element is
     // auto-generated.
     if (item.parent) {
       gShownMenuItems.get(item.extension).push(item.id);
     }
 
@@ -880,18 +879,19 @@ this.menusInternal = class extends Exten
         removeAll: function() {
           let root = gRootItems.get(extension);
           if (root) {
             root.remove();
           }
         },
 
         onClicked: new EventManager(context, "menusInternal.onClicked", fire => {
-          let listener = (event, info, tab) => {
-            let {linkedBrowser} = tab || tabTracker.activeTab;
+          let listener = (event, info, nativeTab) => {
+            let {linkedBrowser} = nativeTab || tabTracker.activeTab;
+            let tab = nativeTab && extension.tabManager.convert(nativeTab);
             context.withPendingBrowser(linkedBrowser,
                                        () => fire.sync(info, tab));
           };
 
           extension.on("webext-menu-menuitem-click", listener);
           return () => {
             extension.off("webext-menu-menuitem-click", listener);
           };
--- a/browser/components/extensions/test/browser/browser_ext_user_events.js
+++ b/browser/components/extensions/test/browser/browser_ext_user_events.js
@@ -1,68 +1,106 @@
 "use strict";
 
+/**
+ * Wait for the given PopupNotification to display
+ *
+ * @param {string} name
+ *        The name of the notification to wait for.
+ *
+ * @returns {Promise}
+ *          Resolves with the notification window.
+ */
+function promisePopupNotificationShown(name) {
+  return new Promise(resolve => {
+    function popupshown() {
+      let notification = PopupNotifications.getNotification(name);
+      if (!notification) { return; }
+
+      ok(notification, `${name} notification shown`);
+      ok(PopupNotifications.isPanelOpen, "notification panel open");
+
+      PopupNotifications.panel.removeEventListener("popupshown", popupshown);
+      resolve(PopupNotifications.panel.firstChild);
+    }
+
+    PopupNotifications.panel.addEventListener("popupshown", popupshown);
+  });
+}
+
 // Test that different types of events are all considered
 // "handling user input".
 add_task(async function testSources() {
   let extension = ExtensionTestUtils.loadExtension({
     async background() {
-      async function request() {
+      async function request(perm) {
         try {
           let result = await browser.permissions.request({
-            permissions: ["cookies"],
+            permissions: [perm],
           });
           browser.test.sendMessage("request", {success: true, result});
         } catch (err) {
           browser.test.sendMessage("request", {success: false, errmsg: err.message});
         }
       }
 
       let tabs = await browser.tabs.query({active: true, currentWindow: true});
       await browser.pageAction.show(tabs[0].id);
 
-      browser.pageAction.onClicked.addListener(request);
-      browser.browserAction.onClicked.addListener(request);
+      browser.pageAction.onClicked.addListener(() => request("bookmarks"));
+      browser.browserAction.onClicked.addListener(() => request("tabs"));
 
       browser.contextMenus.create({
         id: "menu",
         title: "test user events",
         contexts: ["page"],
       });
-      browser.contextMenus.onClicked.addListener(request);
+      browser.contextMenus.onClicked.addListener(() => request("webNavigation"));
 
       browser.test.sendMessage("actions-ready");
     },
 
     manifest: {
       browser_action: {default_title: "test"},
       page_action: {default_title: "test"},
       permissions: ["contextMenus"],
-      optional_permissions: ["cookies"],
+      optional_permissions: ["bookmarks", "tabs", "webNavigation"],
     },
   });
 
   async function check(what) {
     let result = await extension.awaitMessage("request");
     ok(result.success, `request() did not throw when called from ${what}`);
     is(result.result, true, `request() succeeded when called from ${what}`);
   }
 
   // Remove Sidebar button to prevent pushing extension button to overflow menu
   CustomizableUI.removeWidgetFromArea("sidebar-button");
 
   await extension.startup();
   await extension.awaitMessage("actions-ready");
 
+  promisePopupNotificationShown("addon-webext-permissions").then(panel => {
+    panel.button.click();
+  });
+
   clickPageAction(extension);
   await check("page action click");
 
+  promisePopupNotificationShown("addon-webext-permissions").then(panel => {
+    panel.button.click();
+  });
+
   clickBrowserAction(extension);
   await check("browser action click");
 
+  promisePopupNotificationShown("addon-webext-permissions").then(panel => {
+    panel.button.click();
+  });
+
   let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser);
   gBrowser.selectedTab = tab;
 
   let menu = await openContextMenu("body");
   let items = menu.getElementsByAttribute("label", "test user events");
   is(items.length, 1, "Found context menu item");
   EventUtils.synthesizeMouseAtCenter(items[0], {});
   await check("context menu click");
--- a/browser/components/places/content/controller.js
+++ b/browser/components/places/content/controller.js
@@ -395,17 +395,16 @@ PlacesController.prototype = {
   _buildSelectionMetadata: function PC__buildSelectionMetadata() {
     var metadata = [];
     var nodes = this._view.selectedNodes;
 
     for (var i = 0; i < nodes.length; i++) {
       var nodeData = {};
       var node = nodes[i];
       var nodeType = node.type;
-      var uri = null;
 
       // We don't use the nodeIs* methods here to avoid going through the type
       // property way too often
       switch (nodeType) {
         case Ci.nsINavHistoryResultNode.RESULT_TYPE_QUERY:
           nodeData.query = true;
           if (node.parent) {
             switch (PlacesUtils.asQuery(node.parent).queryOptions.resultType) {
@@ -417,50 +416,38 @@ PlacesController.prototype = {
                 nodeData.day = true;
                 break;
             }
           }
           break;
         case Ci.nsINavHistoryResultNode.RESULT_TYPE_FOLDER:
         case Ci.nsINavHistoryResultNode.RESULT_TYPE_FOLDER_SHORTCUT:
           nodeData.folder = true;
+          if (this.hasCachedLivemarkInfo(node)) {
+            nodeData.livemark = true;
+          }
           break;
         case Ci.nsINavHistoryResultNode.RESULT_TYPE_SEPARATOR:
           nodeData.separator = true;
           break;
         case Ci.nsINavHistoryResultNode.RESULT_TYPE_URI:
           nodeData.link = true;
-          uri = Services.io.newURI(node.uri);
           if (PlacesUtils.nodeIsBookmark(node)) {
             nodeData.bookmark = true;
             var parentNode = node.parent;
             if (parentNode) {
               if (PlacesUtils.nodeIsTagQuery(parentNode))
                 nodeData.tagChild = true;
               else if (this.hasCachedLivemarkInfo(parentNode))
                 nodeData.livemarkChild = true;
             }
           }
           break;
       }
 
-      // annotations
-      if (uri) {
-        let names = PlacesUtils.annotations.getPageAnnotationNames(uri);
-        for (let j = 0; j < names.length; ++j)
-          nodeData[names[j]] = true;
-      }
-
-      // For items also include the item-specific annotations
-      if (node.itemId != -1) {
-        let names = PlacesUtils.annotations
-                               .getItemAnnotationNames(node.itemId);
-        for (let j = 0; j < names.length; ++j)
-          nodeData[names[j]] = true;
-      }
       metadata.push(nodeData);
     }
 
     return metadata;
   },
 
   /**
    * Determines if a context-menu item should be shown
--- a/browser/components/places/content/placesContextMenu.inc.xul
+++ b/browser/components/places/content/placesContextMenu.inc.xul
@@ -120,17 +120,17 @@
             accesskey="&cmd.context_sortby_name.accesskey;"
             closemenu="single"
             selection="folder"/>
   <menuitem id="placesContext_reload"
             command="placesCmd_reload"
             label="&cmd.reloadLivebookmark.label;"
             accesskey="&cmd.reloadLivebookmark.accesskey;"
             closemenu="single"
-            selection="livemark/feedURI"/>
+            selection="livemark"/>
   <menuseparator id="placesContext_sortSeparator"/>
   <menuitem id="placesContext_show:info"
             command="placesCmd_show:info"
             label="&cmd.properties.label;"
             accesskey="&cmd.properties.accesskey;"
             selection="bookmark|folder|query"
             forcehideselection="livemarkChild"/>
-</menupopup>
\ No newline at end of file
+</menupopup>
--- a/chrome/test/unit/data/test_bug564667/chrome.manifest
+++ b/chrome/test/unit/data/test_bug564667/chrome.manifest
@@ -7,10 +7,9 @@ skin     test1 test  test/
 content testOverride  test/
 override chrome://testOverride/content file:///test1/override
 
 
 # Load external manifest
 manifest loaded.manifest
 
 # Failure Cases
-overlay   chrome://test1/content/overlay.xul   chrome://test1/content/test1.xul
 style     chrome://test1/content/style.xul     chrome://test1/content/test1.css
--- a/chrome/test/unit/test_bug564667.js
+++ b/chrome/test/unit/test_bug564667.js
@@ -33,32 +33,26 @@ function test_removed_mapping(chromeURL,
     gCR.convertChromeURL(uri);
     do_throw(chromeURL + " not removed");
   } catch (ex) {
     // This should throw
   }
 }
 
 /*
- * Checks if any overlay was added after loading
+ * Checks if any style overlays were added after loading
  * the manifest files
- *
- * @param type The type of overlay: overlay|style
  */
-function test_no_overlays(chromeURL, target, type = "overlay") {
+function test_no_overlays(chromeURL, target) {
   var uri = Services.io.newURI(chromeURL);
-  var overlays = (type == "overlay") ?
-      gCR.getXULOverlays(uri) : gCR.getStyleOverlays(uri);
+  var overlays = gCR.getStyleOverlays(uri);
 
-  // We shouldn't be allowed to register overlays nor styles
+  // We shouldn't be allowed to register styles
   if (overlays.hasMoreElements()) {
-    if (type == "styles")
-      do_throw("Style Registered: " + chromeURL);
-    else
-      do_throw("Overlay Registered: " + chromeURL);
+    do_throw("Style Registered: " + chromeURL);
   }
 }
 
 function testManifest(manifestPath, baseURI) {
 
   // ------------------  Add manifest file ------------------------
   Components.manager.addBootstrappedManifestLocation(manifestPath);
 
@@ -73,25 +67,20 @@ function testManifest(manifestPath, base
 
   // Test Adding Manifest URL
   test_mapping("chrome://test2/content", baseURI + "test/test2.xul");
   test_mapping("chrome://test2/locale", baseURI + "test/test2.dtd");
 
   // Test Adding Override
   test_mapping("chrome://testOverride/content", "file:///test1/override");
 
-  // Test Not-Adding Overlays
-  test_no_overlays("chrome://test1/content/overlay.xul",
-                   "chrome://test1/content/test1.xul");
-
   // Test Not-Adding Styles
   test_no_overlays("chrome://test1/content/style.xul",
                    "chrome://test1/content/test1.css", "styles");
 
-
   // ------------------  Remove manifest file ------------------------
   Components.manager.removeBootstrappedManifestLocation(manifestPath);
 
   // Test Removing Content URL
   test_removed_mapping("chrome://test1/content", baseURI + "test/test1.xul");
 
   // Test Removing Content URL
   test_removed_mapping("chrome://test1/locale", baseURI + "test/test1.dtd");
--- a/devtools/client/animationinspector/test/browser_animation_detail_easings.js
+++ b/devtools/client/animationinspector/test/browser_animation_detail_easings.js
@@ -87,30 +87,32 @@ add_task(async function() {
         const titleEl = gEl.querySelector("title");
         ok(titleEl, `<title> element for ${ testIdentity } should exists`);
         is(titleEl.textContent, expectedValue,
            `textContent of <title> for ${ testIdentity } should be ${ expectedValue }`);
 
         info("Test emphasis path");
         // Scroll to show the hintEl since the element may be out of displayed area.
         hintEl.scrollIntoView(false);
+        const win = hintEl.ownerGlobal;
 
-        const win = hintEl.ownerDocument.defaultView;
-        // Mouse out once from hintEl.
-        EventUtils.synthesizeMouse(hintEl, -1, -1, {type: "mouseout"}, win);
-        is(win.getComputedStyle(hintEl).strokeOpacity, 0,
-           `stroke-opacity of hintEl for ${ testIdentity } should be 0 ` +
-           `while mouse is out from the element`);
-        // Mouse is over the hintEl.
-        EventUtils.synthesizeMouseAtCenter(hintEl, {type: "mouseover"}, win);
+        // Mouse is over the hintEl. Ideally this would use EventUtils, but mouseover
+        // on the path element is flaky, so let's trust that hovering works and force
+        // on a hover class to get the same styles.
+        hintEl.classList.add("hover");
         if (testdata.noEmphasisPath) {
           is(win.getComputedStyle(hintEl).strokeOpacity, 0,
              `stroke-opacity of hintEl for ${ testIdentity } should be 0 ` +
              `even while mouse is over the element`);
         } else {
           is(win.getComputedStyle(hintEl).strokeOpacity, 1,
              `stroke-opacity of hintEl for ${ testIdentity } should be 1 ` +
              `while mouse is over the element`);
         }
+        // Mouse out once from hintEl.
+        hintEl.classList.remove("hover");
+        is(win.getComputedStyle(hintEl).strokeOpacity, 0,
+           `stroke-opacity of hintEl for ${ testIdentity } should be 0 ` +
+           `while mouse is out from the element`);
       }
     }
   }
 });
--- a/devtools/client/framework/toolbox-hosts.js
+++ b/devtools/client/framework/toolbox-hosts.js
@@ -62,16 +62,17 @@ BottomHost.prototype = {
     this._nbox = gBrowser.getNotificationBox(this.hostTab.linkedBrowser);
 
     this._splitter = ownerDocument.createElement("splitter");
     this._splitter.setAttribute("class", "devtools-horizontal-splitter");
     // Avoid resizing notification containers
     this._splitter.setAttribute("resizebefore", "flex");
 
     this.frame = ownerDocument.createElement("iframe");
+    this.frame.flex = 1; // Required to be able to shrink when the window shrinks
     this.frame.className = "devtools-toolbox-bottom-iframe";
     this.frame.height = Math.min(
       Services.prefs.getIntPref(this.heightPref),
       this._nbox.clientHeight - MIN_PAGE_SIZE
     );
 
     this._nbox.appendChild(this._splitter);
     this._nbox.appendChild(this.frame);
@@ -149,16 +150,17 @@ SidebarHost.prototype = {
     let gBrowser = this.hostTab.ownerDocument.defaultView.gBrowser;
     let ownerDocument = gBrowser.ownerDocument;
     this._sidebar = gBrowser.getSidebarContainer(this.hostTab.linkedBrowser);
 
     this._splitter = ownerDocument.createElement("splitter");
     this._splitter.setAttribute("class", "devtools-side-splitter");
 
     this.frame = ownerDocument.createElement("iframe");
+    this.frame.flex = 1; // Required to be able to shrink when the window shrinks
     this.frame.className = "devtools-toolbox-side-iframe";
 
     this.frame.width = Math.min(
       Services.prefs.getIntPref(this.widthPref),
       this._sidebar.clientWidth - MIN_PAGE_SIZE
     );
 
     this._sidebar.appendChild(this._splitter);
--- a/devtools/client/framework/toolbox.xul
+++ b/devtools/client/framework/toolbox.xul
@@ -53,15 +53,15 @@
     <div xmlns="http://www.w3.org/1999/xhtml" id="toolbox-notificationbox"/>
     <div xmlns="http://www.w3.org/1999/xhtml" id="toolbox-toolbar-mount"
          role="toolbar" />
     <vbox flex="1" class="theme-body">
       <!-- Set large flex to allow the toolbox-panel-webconsole to have a
            height set to a small value without flexing to fill up extra
            space. There must be a flex on both to ensure that the console
            panel itself is sized properly -->
-      <box id="toolbox-deck" flex="1000" minheight="75" />
+      <box id="toolbox-deck" flex="10000" minheight="75" />
       <splitter id="toolbox-console-splitter" class="devtools-horizontal-splitter" hidden="true" />
       <box minheight="75" flex="1" id="toolbox-panel-webconsole" collapsed="true" />
     </vbox>
     <tooltip id="aHTMLTooltip" page="true" />
   </vbox>
 </window>
--- a/devtools/client/inspector/markup/test/browser_markup_shadowdom.js
+++ b/devtools/client/inspector/markup/test/browser_markup_shadowdom.js
@@ -197,8 +197,35 @@ add_task(async function() {
           ::after
       ::before
       class="light-dom"
       ::after`;
 
   let {inspector} = await openInspectorForURL(TEST_URL);
   await checkTreeFromRootSelector(EXPECTED_TREE, "test-component", inspector);
 });
+
+add_task(async function() {
+  await enableWebComponents();
+
+  // Test empty web components are still displayed correctly.
+
+  const TEST_URL = `data:text/html;charset=utf-8,
+    <test-component></test-component>
+
+    <script>
+      "use strict";
+      customElements.define("test-component", class extends HTMLElement {
+        constructor() {
+          super();
+          let shadowRoot = this.attachShadow({mode: "open"});
+          shadowRoot.innerHTML = "";
+        }
+      });
+    </script>`;
+
+  const EXPECTED_TREE = `
+    test-component
+      #shadow-root`;
+
+  let {inspector} = await openInspectorForURL(TEST_URL);
+  await checkTreeFromRootSelector(EXPECTED_TREE, "test-component", inspector);
+});
--- a/devtools/client/shared/test/browser_flame-graph-01.js
+++ b/devtools/client/shared/test/browser_flame-graph-01.js
@@ -37,19 +37,19 @@ async function performTest() {
 function testGraph(host, graph) {
   ok(graph._container.classList.contains("flame-graph-widget-container"),
     "The correct graph container was created.");
   ok(graph._canvas.classList.contains("flame-graph-widget-canvas"),
     "The correct graph container was created.");
 
   let bounds = host.frame.getBoundingClientRect();
 
-  is(graph.width, bounds.width * window.devicePixelRatio,
+  is(graph.width, Math.round(bounds.width * window.devicePixelRatio),
     "The graph has the correct width.");
-  is(graph.height, bounds.height * window.devicePixelRatio,
+  is(graph.height, Math.round(bounds.height * window.devicePixelRatio),
     "The graph has the correct height.");
 
   ok(graph._selection.start === null,
     "The graph's selection start value is initially null.");
   ok(graph._selection.end === null,
     "The graph's selection end value is initially null.");
 
   ok(graph._selectionDragger.origin === null,
--- a/devtools/client/themes/animationinspector.css
+++ b/devtools/client/themes/animationinspector.css
@@ -697,17 +697,20 @@ body {
   stroke-linecap: round;
   stroke-width: 5;
 }
 
 .keyframes svg path.hint {
   fill: none;
 }
 
-.keyframes svg path.hint:hover {
+/* Note: We only use the hover class in a mochitest due to flakiness
+   when simulating mouseover (Bug 1448555). */
+.keyframes svg path.hint:hover,
+.keyframes svg path.hint.hover {
   stroke-opacity: 1;
 }
 
 .keyframes svg rect.hint {
   fill-opacity: .1;
 }
 
 .animation-detail {
--- a/devtools/client/themes/webconsole.css
+++ b/devtools/client/themes/webconsole.css
@@ -407,17 +407,17 @@ html #webconsole-notificationbox {
 
 html .jsterm-stack-node {
   position: relative;
 }
 
 textarea.jsterm-input-node,
 textarea.jsterm-complete-node {
   width: 100%;
-  border: none;
+  border: 1px solid transparent;
   margin: 0;
   background-color: transparent;
   resize: none;
   font-size: inherit;
   line-height: 16px;
   overflow-x: hidden;
   /* Set padding for console input on textarea to make sure it is included in
      scrollHeight that is used when resizing JSTerminal's input. */
@@ -431,16 +431,24 @@ textarea.jsterm-complete-node {
   left: 0;
   height: 100%;
   pointer-events: none;
 }
 
 textarea.jsterm-input-node:focus {
   background-image: var(--theme-command-line-image-focus);
   box-shadow: none;
+  border: 1px solid var(--blue-50);
+  transition: border-color 0.2s ease-in-out;
+  outline: none;
+}
+
+:root[platform="mac"] textarea.jsterm-input-node,
+:root[platform="mac"] textarea.jsterm-complete-node {
+  border-radius: 0 0 4px 4px;
 }
 
 
 /*  styles for the old frontend, which can be removed in Bug 1381834 */
 
 textbox.jsterm-input-node,
 textbox.jsterm-complete-node {
   border: none;
--- a/devtools/client/webconsole/jsterm.js
+++ b/devtools/client/webconsole/jsterm.js
@@ -256,16 +256,18 @@ JSTerm.prototype = {
     let toolbox = gDevTools.getToolbox(this.hud.owner.target);
     let tooltipDoc = toolbox ? toolbox.doc : doc;
     // The popup will be attached to the toolbox document or HUD document in the case
     // such as the browser console which doesn't have a toolbox.
     this.autocompletePopup = new AutocompletePopup(tooltipDoc, autocompleteOptions);
     let inputContainer = doc.querySelector(".jsterm-input-container");
     this.completeNode = doc.querySelector(".jsterm-complete-node");
     this.inputNode = doc.querySelector(".jsterm-input-node");
+    this.inputBorderSize = this.inputNode.getBoundingClientRect().height -
+                           this.inputNode.clientHeight;
     // Update the character width and height needed for the popup offset
     // calculations.
     this._updateCharSize();
 
     if (this.hud.isBrowserConsole &&
         !Services.prefs.getBoolPref("devtools.chrome.enabled")) {
       inputContainer.style.display = "none";
     } else {
@@ -1033,17 +1035,17 @@ JSTerm.prototype = {
 
     // Now resize the input field to fit its contents.
     // TODO: remove `inputNode.inputField.scrollHeight` when the old
     // console UI is removed. See bug 1381834
     let scrollHeight = inputNode.inputField ?
       inputNode.inputField.scrollHeight : inputNode.scrollHeight;
 
     if (scrollHeight > 0) {
-      inputNode.style.height = scrollHeight + "px";
+      inputNode.style.height = (scrollHeight + this.inputBorderSize) + "px";
     }
   },
 
   /**
    * Sets the value of the input field (command line), and resizes the field to
    * fit its contents. This method is preferred over setting "inputNode.value"