The Tor Browser: browser/components/customizableui/src/CustomizeMode.jsm@8bccb770b82d (annotated)

browser/components/customizableui/src/CustomizeMode.jsm@8bccb770b82d (annotated)

browser/components/customizableui/src/CustomizeMode.jsm

Wed, 31 Dec 2014 13:27:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 13:27:57 +0100
branch: TOR_BUG_3246
changeset 6: 8bccb770b82d
permissions: -rw-r--r--

Ignore runtime configuration files generated during quality assurance.

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 "use strict";
 this.EXPORTED_SYMBOLS = ["CustomizeMode"];
 const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
 const kPrefCustomizationDebug = "browser.uiCustomization.debug";
 const kPrefCustomizationAnimation = "browser.uiCustomization.disableAnimation";
 const kPaletteId = "customization-palette";
 const kAboutURI = "about:customizing";
 const kDragDataTypePrefix = "text/toolbarwrapper-id/";
 const kPlaceholderClass = "panel-customization-placeholder";
 const kSkipSourceNodePref = "browser.uiCustomization.skipSourceNodeCheck";
 const kToolbarVisibilityBtn = "customization-toolbar-visibility-button";
 const kDrawInTitlebarPref = "browser.tabs.drawInTitlebar";
 const kMaxTransitionDurationMs = 2000;
 const kPanelItemContextMenu = "customizationPanelItemContextMenu";
 const kPaletteItemContextMenu = "customizationPaletteItemContextMenu";
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource:///modules/CustomizableUI.jsm");
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Task.jsm");
 Cu.import("resource://gre/modules/Promise.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "DragPositionManager",
                                   "resource:///modules/DragPositionManager.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "BrowserUITelemetry",
                                   "resource:///modules/BrowserUITelemetry.jsm");
 let gModuleName = "[CustomizeMode]";
 #include logging.js
 let gDisableAnimation = null;
 let gDraggingInToolbars;
 function CustomizeMode(aWindow) {
   if (gDisableAnimation === null) {
     gDisableAnimation = Services.prefs.getPrefType(kPrefCustomizationAnimation) == Ci.nsIPrefBranch.PREF_BOOL &&
                         Services.prefs.getBoolPref(kPrefCustomizationAnimation);
   }
   this.window = aWindow;
   this.document = aWindow.document;
   this.browser = aWindow.gBrowser;
   // There are two palettes - there's the palette that can be overlayed with
   // toolbar items in browser.xul. This is invisible, and never seen by the
   // user. Then there's the visible palette, which gets populated and displayed
   // to the user when in customizing mode.
   this.visiblePalette = this.document.getElementById(kPaletteId);
   this.paletteEmptyNotice = this.document.getElementById("customization-empty");
   this.paletteSpacer = this.document.getElementById("customization-spacer");
   this.tipPanel = this.document.getElementById("customization-tipPanel");
 #ifdef CAN_DRAW_IN_TITLEBAR
   this._updateTitlebarButton();
   Services.prefs.addObserver(kDrawInTitlebarPref, this, false);
   this.window.addEventListener("unload", this);
 #endif
 };
 CustomizeMode.prototype = {
   _changed: false,
   _transitioning: false,
   window: null,
   document: null,
   // areas is used to cache the customizable areas when in customization mode.
   areas: null,
   // When in customizing mode, we swap out the reference to the invisible
   // palette in gNavToolbox.palette for our visiblePalette. This way, for the
   // customizing browser window, when widgets are removed from customizable
   // areas and added to the palette, they're added to the visible palette.
   // _stowedPalette is a reference to the old invisible palette so we can
   // restore gNavToolbox.palette to its original state after exiting
   // customization mode.
   _stowedPalette: null,
   _dragOverItem: null,
   _customizing: false,
   _skipSourceNodeCheck: null,
   _mainViewContext: null,
   get panelUIContents() {
     return this.document.getElementById("PanelUI-contents");
   },
   get _handler() {
     return this.window.CustomizationHandler;
   },
   uninit: function() {
 #ifdef CAN_DRAW_IN_TITLEBAR
     Services.prefs.removeObserver(kDrawInTitlebarPref, this);
 #endif
   },
   toggle: function() {
     if (this._handler.isEnteringCustomizeMode || this._handler.isExitingCustomizeMode) {
       this._wantToBeInCustomizeMode = !this._wantToBeInCustomizeMode;
       return;
     }
     if (this._customizing) {
       this.exit();
     } else {
       this.enter();
     }
   },
   enter: function() {
     this._wantToBeInCustomizeMode = true;
     if (this._customizing || this._handler.isEnteringCustomizeMode) {
       return;
     }
     // Exiting; want to re-enter once we've done that.
     if (this._handler.isExitingCustomizeMode) {
       LOG("Attempted to enter while we're in the middle of exiting. " +
           "We'll exit after we've entered");
       return;
     }
     // We don't need to switch to kAboutURI, or open a new tab at
     // kAboutURI if we're already on it.
     if (this.browser.selectedBrowser.currentURI.spec != kAboutURI) {
       this.window.switchToTabHavingURI(kAboutURI, true, {
         skipTabAnimation: true,
       });
       return;
     }
     let window = this.window;
     let document = this.document;
     this._handler.isEnteringCustomizeMode = true;
     // Always disable the reset button at the start of customize mode, it'll be re-enabled
     // if necessary when we finish entering:
     let resetButton = this.document.getElementById("customization-reset-button");
     resetButton.setAttribute("disabled", "true");
     Task.spawn(function() {
       // We shouldn't start customize mode until after browser-delayed-startup has finished:
       if (!this.window.gBrowserInit.delayedStartupFinished) {
         let delayedStartupDeferred = Promise.defer();
         let delayedStartupObserver = function(aSubject) {
           if (aSubject == this.window) {
             Services.obs.removeObserver(delayedStartupObserver, "browser-delayed-startup-finished");
             delayedStartupDeferred.resolve();
           }
         }.bind(this);
         Services.obs.addObserver(delayedStartupObserver, "browser-delayed-startup-finished", false);
         yield delayedStartupDeferred.promise;
       }
       let toolbarVisibilityBtn = document.getElementById(kToolbarVisibilityBtn);
       let togglableToolbars = window.getTogglableToolbars();
       let bookmarksToolbar = document.getElementById("PersonalToolbar");
       if (togglableToolbars.length == 0) {
         toolbarVisibilityBtn.setAttribute("hidden", "true");
       } else {
         toolbarVisibilityBtn.removeAttribute("hidden");
       }
       // Disable lightweight themes while in customization mode since
       // they don't have large enough images to pad the full browser window.
       if (this.document.documentElement._lightweightTheme)
         this.document.documentElement._lightweightTheme.disable();
       CustomizableUI.dispatchToolboxEvent("beforecustomization", {}, window);
       CustomizableUI.notifyStartCustomizing(this.window);
       // Add a keypress listener to the document so that we can quickly exit
       // customization mode when pressing ESC.
       document.addEventListener("keypress", this);
       // Same goes for the menu button - if we're customizing, a click on the
       // menu button means a quick exit from customization mode.
       window.PanelUI.hide();
       window.PanelUI.menuButton.addEventListener("command", this);
       window.PanelUI.menuButton.open = true;
       window.PanelUI.beginBatchUpdate();
       // The menu panel is lazy, and registers itself when the popup shows. We
       // need to force the menu panel to register itself, or else customization
       // is really not going to work. We pass "true" to ensureReady to
       // indicate that we're handling calling startBatchUpdate and
       // endBatchUpdate.
       if (!window.PanelUI.isReady()) {
         yield window.PanelUI.ensureReady(true);
       }
       // Hide the palette before starting the transition for increased perf.
       this.visiblePalette.hidden = true;
       this.visiblePalette.removeAttribute("showing");
       // Disable the button-text fade-out mask
       // during the transition for increased perf.
       let panelContents = window.PanelUI.contents;
       panelContents.setAttribute("customize-transitioning", "true");
       // Move the mainView in the panel to the holder so that we can see it
       // while customizing.
       let mainView = window.PanelUI.mainView;
       let panelHolder = document.getElementById("customization-panelHolder");
       panelHolder.appendChild(mainView);
       let customizeButton = document.getElementById("PanelUI-customize");
       customizeButton.setAttribute("enterLabel", customizeButton.getAttribute("label"));
       customizeButton.setAttribute("label", customizeButton.getAttribute("exitLabel"));
       customizeButton.setAttribute("enterTooltiptext", customizeButton.getAttribute("tooltiptext"));
       customizeButton.setAttribute("tooltiptext", customizeButton.getAttribute("exitTooltiptext"));
       this._transitioning = true;
       let customizer = document.getElementById("customization-container");
       customizer.parentNode.selectedPanel = customizer;
       customizer.hidden = false;
       yield this._doTransition(true);
       // Let everybody in this window know that we're about to customize.
       CustomizableUI.dispatchToolboxEvent("customizationstarting", {}, window);
       this._mainViewContext = mainView.getAttribute("context");
       if (this._mainViewContext) {
         mainView.removeAttribute("context");
       }
       this._showPanelCustomizationPlaceholders();
       yield this._wrapToolbarItems();
       this.populatePalette();
       this._addDragHandlers(this.visiblePalette);
       window.gNavToolbox.addEventListener("toolbarvisibilitychange", this);
       document.getElementById("PanelUI-help").setAttribute("disabled", true);
       document.getElementById("PanelUI-quit").setAttribute("disabled", true);
       this._updateResetButton();
       this._updateUndoResetButton();
       this._skipSourceNodeCheck = Services.prefs.getPrefType(kSkipSourceNodePref) == Ci.nsIPrefBranch.PREF_BOOL &&
                                   Services.prefs.getBoolPref(kSkipSourceNodePref);
       let customizableToolbars = document.querySelectorAll("toolbar[customizable=true]:not([autohide=true]):not([collapsed=true])");
       for (let toolbar of customizableToolbars)
         toolbar.setAttribute("customizing", true);
       CustomizableUI.addListener(this);
       window.PanelUI.endBatchUpdate();
       this._customizing = true;
       this._transitioning = false;
       // Show the palette now that the transition has finished.
       this.visiblePalette.hidden = false;
       window.setTimeout(() => {
         // Force layout reflow to ensure the animation runs,
         // and make it async so it doesn't affect the timing.
         this.visiblePalette.clientTop;
         this.visiblePalette.setAttribute("showing", "true");
       }, 0);
       this.paletteSpacer.hidden = true;
       this._updateEmptyPaletteNotice();
       this.maybeShowTip(panelHolder);
       this._handler.isEnteringCustomizeMode = false;
       panelContents.removeAttribute("customize-transitioning");
       CustomizableUI.dispatchToolboxEvent("customizationready", {}, window);
       this._enableOutlinesTimeout = window.setTimeout(() => {
         this.document.getElementById("nav-bar").setAttribute("showoutline", "true");
         this.panelUIContents.setAttribute("showoutline", "true");
         delete this._enableOutlinesTimeout;
       }, 0);
       // It's possible that we didn't enter customize mode via the menu panel,
       // meaning we didn't kick off about:customizing preloading. If that's
       // the case, let's kick it off for the next time we load this mode.
       window.gCustomizationTabPreloader.ensurePreloading();
       if (!this._wantToBeInCustomizeMode) {
         this.exit();
       }
     }.bind(this)).then(null, function(e) {
       ERROR(e);
       // We should ensure this has been called, and calling it again doesn't hurt:
       window.PanelUI.endBatchUpdate();
       this._handler.isEnteringCustomizeMode = false;
     }.bind(this));
   },
   exit: function() {
     this._wantToBeInCustomizeMode = false;
     if (!this._customizing || this._handler.isExitingCustomizeMode) {
       return;
     }
     // Entering; want to exit once we've done that.
     if (this._handler.isEnteringCustomizeMode) {
       LOG("Attempted to exit while we're in the middle of entering. " +
           "We'll exit after we've entered");
       return;
     }
     if (this.resetting) {
       LOG("Attempted to exit while we're resetting. " +
           "We'll exit after resetting has finished.");
       return;
     }
     this.hideTip();
     this._handler.isExitingCustomizeMode = true;
     if (this._enableOutlinesTimeout) {
       this.window.clearTimeout(this._enableOutlinesTimeout);
     } else {
       this.document.getElementById("nav-bar").removeAttribute("showoutline");
       this.panelUIContents.removeAttribute("showoutline");
     }
     this._removeExtraToolbarsIfEmpty();
     CustomizableUI.removeListener(this);
     this.document.removeEventListener("keypress", this);
     this.window.PanelUI.menuButton.removeEventListener("command", this);
     this.window.PanelUI.menuButton.open = false;
     this.window.PanelUI.beginBatchUpdate();
     this._removePanelCustomizationPlaceholders();
     let window = this.window;
     let document = this.document;
     let documentElement = document.documentElement;
     // Hide the palette before starting the transition for increased perf.
     this.paletteSpacer.hidden = false;
     this.visiblePalette.hidden = true;
     this.visiblePalette.removeAttribute("showing");
     this.paletteEmptyNotice.hidden = true;
     // Disable the button-text fade-out mask
     // during the transition for increased perf.
     let panelContents = window.PanelUI.contents;
     panelContents.setAttribute("customize-transitioning", "true");
     // Disable the reset and undo reset buttons while transitioning:
     let resetButton = this.document.getElementById("customization-reset-button");
     let undoResetButton = this.document.getElementById("customization-undo-reset-button");
     undoResetButton.hidden = resetButton.disabled = true;
     this._transitioning = true;
     Task.spawn(function() {
       yield this.depopulatePalette();
       yield this._doTransition(false);
       let browser = document.getElementById("browser");
       if (this.browser.selectedBrowser.currentURI.spec == kAboutURI) {
         let custBrowser = this.browser.selectedBrowser;
         if (custBrowser.canGoBack) {
           // If there's history to this tab, just go back.
           // Note that this throws an exception if the previous document has a
           // problematic URL (e.g. about:idontexist)
           try {
             custBrowser.goBack();
           } catch (ex) {
             ERROR(ex);
           }
         } else {
           // If we can't go back, we're removing the about:customization tab.
           // We only do this if we're the top window for this window (so not
           // a dialog window, for example).
           if (window.getTopWin(true) == window) {
             let customizationTab = this.browser.selectedTab;
             if (this.browser.browsers.length == 1) {
               window.BrowserOpenTab();
             }
             this.browser.removeTab(customizationTab);
           }
         }
       }
       browser.parentNode.selectedPanel = browser;
       let customizer = document.getElementById("customization-container");
       customizer.hidden = true;
       window.gNavToolbox.removeEventListener("toolbarvisibilitychange", this);
       DragPositionManager.stop();
       this._removeDragHandlers(this.visiblePalette);
       yield this._unwrapToolbarItems();
       if (this._changed) {
         // XXXmconley: At first, it seems strange to also persist the old way with
         //             currentset - but this might actually be useful for switching
         //             to old builds. We might want to keep this around for a little
         //             bit.
         this.persistCurrentSets();
       }
       // And drop all area references.
       this.areas = [];
       // Let everybody in this window know that we're starting to
       // exit customization mode.
       CustomizableUI.dispatchToolboxEvent("customizationending", {}, window);
       window.PanelUI.setMainView(window.PanelUI.mainView);
       window.PanelUI.menuButton.disabled = false;
       let customizeButton = document.getElementById("PanelUI-customize");
       customizeButton.setAttribute("exitLabel", customizeButton.getAttribute("label"));
       customizeButton.setAttribute("label", customizeButton.getAttribute("enterLabel"));
       customizeButton.setAttribute("exitTooltiptext", customizeButton.getAttribute("tooltiptext"));
       customizeButton.setAttribute("tooltiptext", customizeButton.getAttribute("enterTooltiptext"));
       // We have to use setAttribute/removeAttribute here instead of the
       // property because the XBL property will be set later, and right
       // now we'd be setting an expando, which breaks the XBL property.
       document.getElementById("PanelUI-help").removeAttribute("disabled");
       document.getElementById("PanelUI-quit").removeAttribute("disabled");
       panelContents.removeAttribute("customize-transitioning");
       // We need to set this._customizing to false before removing the tab
       // or the TabSelect event handler will think that we are exiting
       // customization mode for a second time.
       this._customizing = false;
       let mainView = window.PanelUI.mainView;
       if (this._mainViewContext) {
         mainView.setAttribute("context", this._mainViewContext);
       }
       if (this.document.documentElement._lightweightTheme)
         this.document.documentElement._lightweightTheme.enable();
       let customizableToolbars = document.querySelectorAll("toolbar[customizable=true]:not([autohide=true])");
       for (let toolbar of customizableToolbars)
         toolbar.removeAttribute("customizing");
       this.window.PanelUI.endBatchUpdate();
       this._changed = false;
       this._transitioning = false;
       this._handler.isExitingCustomizeMode = false;
       CustomizableUI.dispatchToolboxEvent("aftercustomization", {}, window);
       CustomizableUI.notifyEndCustomizing(window);
       if (this._wantToBeInCustomizeMode) {
         this.enter();
       }
     }.bind(this)).then(null, function(e) {
       ERROR(e);
       // We should ensure this has been called, and calling it again doesn't hurt:
       window.PanelUI.endBatchUpdate();
       this._handler.isExitingCustomizeMode = false;
     }.bind(this));
   },
   /**
    * The customize mode transition has 3 phases when entering:
    * 1) Pre-customization mode
    *    This is the starting phase of the browser.
    * 2) customize-entering
    *    This phase is a transition, optimized for smoothness.
    * 3) customize-entered
    *    After the transition completes, this phase draws all of the
    *    expensive detail that isn't necessary during the second phase.
    *
    * Exiting customization mode has a similar set of phases, but in reverse
    * order - customize-entered, customize-exiting, pre-customization mode.
    *
    * When in the customize-entering, customize-entered, or customize-exiting
    * phases, there is a "customizing" attribute set on the main-window to simplify
    * excluding certain styles while in any phase of customize mode.
    */
   _doTransition: function(aEntering) {
     let deferred = Promise.defer();
     let deck = this.document.getElementById("content-deck");
     let customizeTransitionEnd = function(aEvent) {
       if (aEvent != "timedout" &&
           (aEvent.originalTarget != deck || aEvent.propertyName != "margin-left")) {
         return;
       }
       this.window.clearTimeout(catchAllTimeout);
       // Bug 962677: We let the event loop breathe for before we do the final
       // stage of the transition to improve perceived performance.
       this.window.setTimeout(function () {
         deck.removeEventListener("transitionend", customizeTransitionEnd);
         if (!aEntering) {
           this.document.documentElement.removeAttribute("customize-exiting");
           this.document.documentElement.removeAttribute("customizing");
         } else {
           this.document.documentElement.setAttribute("customize-entered", true);
           this.document.documentElement.removeAttribute("customize-entering");
         }
         CustomizableUI.dispatchToolboxEvent("customization-transitionend", aEntering, this.window);
         deferred.resolve();
       }.bind(this), 0);
     }.bind(this);
     deck.addEventListener("transitionend", customizeTransitionEnd);
     if (gDisableAnimation) {
       this.document.getElementById("tab-view-deck").setAttribute("fastcustomizeanimation", true);
     }
     if (aEntering) {
       this.document.documentElement.setAttribute("customizing", true);
       this.document.documentElement.setAttribute("customize-entering", true);
     } else {
       this.document.documentElement.setAttribute("customize-exiting", true);
       this.document.documentElement.removeAttribute("customize-entered");
     }
     let catchAll = () => customizeTransitionEnd("timedout");
     let catchAllTimeout = this.window.setTimeout(catchAll, kMaxTransitionDurationMs);
     return deferred.promise;
   },
   maybeShowTip: function(aAnchor) {
     let shown = false;
     const kShownPref = "browser.customizemode.tip0.shown";
     try {
       shown = Services.prefs.getBoolPref(kShownPref);
     } catch (ex) {}
     if (shown)
       return;
     let anchorNode = aAnchor || this.document.getElementById("customization-panelHolder");
     let messageNode = this.tipPanel.querySelector(".customization-tipPanel-contentMessage");
     if (!messageNode.childElementCount) {
       // Put the tip contents in the popup.
       let bundle = this.document.getElementById("bundle_browser");
       const kLabelClass = "customization-tipPanel-link";
       messageNode.innerHTML = bundle.getFormattedString("customizeTips.tip0", [
         "<label class=\"customization-tipPanel-em\" value=\"" +
           bundle.getString("customizeTips.tip0.hint") + "\"/>",
         this.document.getElementById("bundle_brand").getString("brandShortName"),
         "<label class=\"" + kLabelClass + " text-link\" value=\"" +
         bundle.getString("customizeTips.tip0.learnMore") + "\"/>"
       ]);
       messageNode.querySelector("." + kLabelClass).addEventListener("click", () => {
         let url = Services.urlFormatter.formatURLPref("browser.customizemode.tip0.learnMoreUrl");
         let browser = this.browser;
         browser.selectedTab = browser.addTab(url);
         this.hideTip();
       });
     }
     this.tipPanel.hidden = false;
     this.tipPanel.openPopup(anchorNode);
     Services.prefs.setBoolPref(kShownPref, true);
   },
   hideTip: function() {
     this.tipPanel.hidePopup();
   },
   _getCustomizableChildForNode: function(aNode) {
     // NB: adjusted from _getCustomizableParent to keep that method fast
     // (it's used during drags), and avoid multiple DOM loops
     let areas = CustomizableUI.areas;
     // Caching this length is important because otherwise we'll also iterate
     // over items we add to the end from within the loop.
     let numberOfAreas = areas.length;
     for (let i = 0; i < numberOfAreas; i++) {
       let area = areas[i];
       let areaNode = aNode.ownerDocument.getElementById(area);
       let customizationTarget = areaNode && areaNode.customizationTarget;
       if (customizationTarget && customizationTarget != areaNode) {
         areas.push(customizationTarget.id);
       }
       let overflowTarget = areaNode.getAttribute("overflowtarget");
       if (overflowTarget) {
         areas.push(overflowTarget);
       }
     }
     areas.push(kPaletteId);
     while (aNode && aNode.parentNode) {
       let parent = aNode.parentNode;
       if (areas.indexOf(parent.id) != -1) {
         return aNode;
       }
       aNode = parent;
     }
     return null;
   },
   addToToolbar: function(aNode) {
     aNode = this._getCustomizableChildForNode(aNode);
     if (aNode.localName == "toolbarpaletteitem" && aNode.firstChild) {
       aNode = aNode.firstChild;
     }
     CustomizableUI.addWidgetToArea(aNode.id, CustomizableUI.AREA_NAVBAR);
     if (!this._customizing) {
       CustomizableUI.dispatchToolboxEvent("customizationchange");
     }
   },
   addToPanel: function(aNode) {
     aNode = this._getCustomizableChildForNode(aNode);
     if (aNode.localName == "toolbarpaletteitem" && aNode.firstChild) {
       aNode = aNode.firstChild;
     }
     CustomizableUI.addWidgetToArea(aNode.id, CustomizableUI.AREA_PANEL);
     if (!this._customizing) {
       CustomizableUI.dispatchToolboxEvent("customizationchange");
     }
   },
   removeFromArea: function(aNode) {
     aNode = this._getCustomizableChildForNode(aNode);
     if (aNode.localName == "toolbarpaletteitem" && aNode.firstChild) {
       aNode = aNode.firstChild;
     }
     CustomizableUI.removeWidgetFromArea(aNode.id);
     if (!this._customizing) {
       CustomizableUI.dispatchToolboxEvent("customizationchange");
     }
   },
   populatePalette: function() {
     let fragment = this.document.createDocumentFragment();
     let toolboxPalette = this.window.gNavToolbox.palette;
     try {
       let unusedWidgets = CustomizableUI.getUnusedWidgets(toolboxPalette);
       for (let widget of unusedWidgets) {
         let paletteItem = this.makePaletteItem(widget, "palette");
         fragment.appendChild(paletteItem);
       }
       this.visiblePalette.appendChild(fragment);
       this._stowedPalette = this.window.gNavToolbox.palette;
       this.window.gNavToolbox.palette = this.visiblePalette;
     } catch (ex) {
       ERROR(ex);
     }
   },
   //XXXunf Maybe this should use -moz-element instead of wrapping the node?
   //       Would ensure no weird interactions/event handling from original node,
   //       and makes it possible to put this in a lazy-loaded iframe/real tab
   //       while still getting rid of the need for overlays.
   makePaletteItem: function(aWidget, aPlace) {
     let widgetNode = aWidget.forWindow(this.window).node;
     let wrapper = this.createOrUpdateWrapper(widgetNode, aPlace);
     wrapper.appendChild(widgetNode);
     return wrapper;
   },
   depopulatePalette: function() {
     return Task.spawn(function() {
       this.visiblePalette.hidden = true;
       let paletteChild = this.visiblePalette.firstChild;
       let nextChild;
       while (paletteChild) {
         nextChild = paletteChild.nextElementSibling;
         let provider = CustomizableUI.getWidget(paletteChild.id).provider;
         if (provider == CustomizableUI.PROVIDER_XUL) {
           let unwrappedPaletteItem =
             yield this.deferredUnwrapToolbarItem(paletteChild);
           this._stowedPalette.appendChild(unwrappedPaletteItem);
         } else if (provider == CustomizableUI.PROVIDER_API) {
           //XXXunf Currently this doesn't destroy the (now unused) node. It would
           //       be good to do so, but we need to keep strong refs to it in
           //       CustomizableUI (can't iterate of WeakMaps), and there's the
           //       question of what behavior wrappers should have if consumers
           //       keep hold of them.
           //widget.destroyInstance(widgetNode);
         } else if (provider == CustomizableUI.PROVIDER_SPECIAL) {
           this.visiblePalette.removeChild(paletteChild);
         }
         paletteChild = nextChild;
       }
       this.visiblePalette.hidden = false;
       this.window.gNavToolbox.palette = this._stowedPalette;
     }.bind(this)).then(null, ERROR);
   },
   isCustomizableItem: function(aNode) {
     return aNode.localName == "toolbarbutton" ||
            aNode.localName == "toolbaritem" ||
            aNode.localName == "toolbarseparator" ||
            aNode.localName == "toolbarspring" ||
            aNode.localName == "toolbarspacer";
   },
   isWrappedToolbarItem: function(aNode) {
     return aNode.localName == "toolbarpaletteitem";
   },
   deferredWrapToolbarItem: function(aNode, aPlace) {
     let deferred = Promise.defer();
     dispatchFunction(function() {
       let wrapper = this.wrapToolbarItem(aNode, aPlace);
       deferred.resolve(wrapper);
     }.bind(this))
     return deferred.promise;
   },
   wrapToolbarItem: function(aNode, aPlace) {
     if (!this.isCustomizableItem(aNode)) {
       return aNode;
     }
     let wrapper = this.createOrUpdateWrapper(aNode, aPlace);
     // It's possible that this toolbar node is "mid-flight" and doesn't have
     // a parent, in which case we skip replacing it. This can happen if a
     // toolbar item has been dragged into the palette. In that case, we tell
     // CustomizableUI to remove the widget from its area before putting the
     // widget in the palette - so the node will have no parent.
     if (aNode.parentNode) {
       aNode = aNode.parentNode.replaceChild(wrapper, aNode);
     }
     wrapper.appendChild(aNode);
     return wrapper;
   },
   createOrUpdateWrapper: function(aNode, aPlace, aIsUpdate) {
     let wrapper;
     if (aIsUpdate && aNode.parentNode && aNode.parentNode.localName == "toolbarpaletteitem") {
       wrapper = aNode.parentNode;
       aPlace = wrapper.getAttribute("place");
     } else {
       wrapper = this.document.createElement("toolbarpaletteitem");
       // "place" is used by toolkit to add the toolbarpaletteitem-palette
       // binding to a toolbarpaletteitem, which gives it a label node for when
       // it's sitting in the palette.
       wrapper.setAttribute("place", aPlace);
     }
     // Ensure the wrapped item doesn't look like it's in any special state, and
     // can't be interactved with when in the customization palette.
     if (aNode.hasAttribute("command")) {
       wrapper.setAttribute("itemcommand", aNode.getAttribute("command"));
       aNode.removeAttribute("command");
     }
     if (aNode.hasAttribute("observes")) {
       wrapper.setAttribute("itemobserves", aNode.getAttribute("observes"));
       aNode.removeAttribute("observes");
     }
     if (aNode.getAttribute("checked") == "true") {
       wrapper.setAttribute("itemchecked", "true");
       aNode.removeAttribute("checked");
     }
     if (aNode.hasAttribute("id")) {
       wrapper.setAttribute("id", "wrapper-" + aNode.getAttribute("id"));
     }
     if (aNode.hasAttribute("label")) {
       wrapper.setAttribute("title", aNode.getAttribute("label"));
     } else if (aNode.hasAttribute("title")) {
       wrapper.setAttribute("title", aNode.getAttribute("title"));
     }
     if (aNode.hasAttribute("flex")) {
       wrapper.setAttribute("flex", aNode.getAttribute("flex"));
     }
     if (aPlace == "panel") {
       if (aNode.classList.contains(CustomizableUI.WIDE_PANEL_CLASS)) {
         wrapper.setAttribute("haswideitem", "true");
       } else if (wrapper.hasAttribute("haswideitem")) {
         wrapper.removeAttribute("haswideitem");
       }
     }
     let removable = aPlace == "palette" || CustomizableUI.isWidgetRemovable(aNode);
     wrapper.setAttribute("removable", removable);
     let contextMenuAttrName = aNode.getAttribute("context") ? "context" :
                                 aNode.getAttribute("contextmenu") ? "contextmenu" : "";
     let currentContextMenu = aNode.getAttribute(contextMenuAttrName);
     let contextMenuForPlace = aPlace == "panel" ?
                                 kPanelItemContextMenu :
                                 kPaletteItemContextMenu;
     if (aPlace != "toolbar") {
       wrapper.setAttribute("context", contextMenuForPlace);
     }
     // Only keep track of the menu if it is non-default.
     if (currentContextMenu &&
         currentContextMenu != contextMenuForPlace) {
       aNode.setAttribute("wrapped-context", currentContextMenu);
       aNode.setAttribute("wrapped-contextAttrName", contextMenuAttrName)
       aNode.removeAttribute(contextMenuAttrName);
     } else if (currentContextMenu == contextMenuForPlace) {
       aNode.removeAttribute(contextMenuAttrName);
     }
     // Only add listeners for newly created wrappers:
     if (!aIsUpdate) {
       wrapper.addEventListener("mousedown", this);
       wrapper.addEventListener("mouseup", this);
     }
     return wrapper;
   },
   deferredUnwrapToolbarItem: function(aWrapper) {
     let deferred = Promise.defer();
     dispatchFunction(function() {
       let item = null;
       try {
         item = this.unwrapToolbarItem(aWrapper);
       } catch (ex) {
         Cu.reportError(ex);
       }
       deferred.resolve(item);
     }.bind(this));
     return deferred.promise;
   },
   unwrapToolbarItem: function(aWrapper) {
     if (aWrapper.nodeName != "toolbarpaletteitem") {
       return aWrapper;
     }
     aWrapper.removeEventListener("mousedown", this);
     aWrapper.removeEventListener("mouseup", this);
     let place = aWrapper.getAttribute("place");
     let toolbarItem = aWrapper.firstChild;
     if (!toolbarItem) {
       ERROR("no toolbarItem child for " + aWrapper.tagName + "#" + aWrapper.id);
       aWrapper.remove();
       return null;
     }
     if (aWrapper.hasAttribute("itemobserves")) {
       toolbarItem.setAttribute("observes", aWrapper.getAttribute("itemobserves"));
     }
     if (aWrapper.hasAttribute("itemchecked")) {
       toolbarItem.checked = true;
     }
     if (aWrapper.hasAttribute("itemcommand")) {
       let commandID = aWrapper.getAttribute("itemcommand");
       toolbarItem.setAttribute("command", commandID);
       //XXX Bug 309953 - toolbarbuttons aren't in sync with their commands after customizing
       let command = this.document.getElementById(commandID);
       if (command && command.hasAttribute("disabled")) {
         toolbarItem.setAttribute("disabled", command.getAttribute("disabled"));
       }
     }
     let wrappedContext = toolbarItem.getAttribute("wrapped-context");
     if (wrappedContext) {
       let contextAttrName = toolbarItem.getAttribute("wrapped-contextAttrName");
       toolbarItem.setAttribute(contextAttrName, wrappedContext);
       toolbarItem.removeAttribute("wrapped-contextAttrName");
       toolbarItem.removeAttribute("wrapped-context");
     } else if (place == "panel") {
       toolbarItem.setAttribute("context", kPanelItemContextMenu);
     }
     if (aWrapper.parentNode) {
       aWrapper.parentNode.replaceChild(toolbarItem, aWrapper);
     }
     return toolbarItem;
   },
   _wrapToolbarItems: function() {
     let window = this.window;
     // Add drag-and-drop event handlers to all of the customizable areas.
     return Task.spawn(function() {
       this.areas = [];
       for (let area of CustomizableUI.areas) {
         let target = CustomizableUI.getCustomizeTargetForArea(area, window);
         this._addDragHandlers(target);
         for (let child of target.children) {
           if (this.isCustomizableItem(child)) {
             yield this.deferredWrapToolbarItem(child, CustomizableUI.getPlaceForItem(child));
           }
         }
         this.areas.push(target);
       }
     }.bind(this)).then(null, ERROR);
   },
   _addDragHandlers: function(aTarget) {
     aTarget.addEventListener("dragstart", this, true);
     aTarget.addEventListener("dragover", this, true);
     aTarget.addEventListener("dragexit", this, true);
     aTarget.addEventListener("drop", this, true);
     aTarget.addEventListener("dragend", this, true);
   },
   _wrapItemsInArea: function(target) {
     for (let child of target.children) {
       if (this.isCustomizableItem(child)) {
         this.wrapToolbarItem(child, CustomizableUI.getPlaceForItem(child));
       }
     }
   },
   _removeDragHandlers: function(aTarget) {
     aTarget.removeEventListener("dragstart", this, true);
     aTarget.removeEventListener("dragover", this, true);
     aTarget.removeEventListener("dragexit", this, true);
     aTarget.removeEventListener("drop", this, true);
     aTarget.removeEventListener("dragend", this, true);
   },
   _unwrapItemsInArea: function(target) {
     for (let toolbarItem of target.children) {
       if (this.isWrappedToolbarItem(toolbarItem)) {
         this.unwrapToolbarItem(toolbarItem);
       }
     }
   },
   _unwrapToolbarItems: function() {
     return Task.spawn(function() {
       for (let target of this.areas) {
         for (let toolbarItem of target.children) {
           if (this.isWrappedToolbarItem(toolbarItem)) {
             yield this.deferredUnwrapToolbarItem(toolbarItem);
           }
         }
         this._removeDragHandlers(target);
       }
     }.bind(this)).then(null, ERROR);
   },
   _removeExtraToolbarsIfEmpty: function() {
     let toolbox = this.window.gNavToolbox;
     for (let child of toolbox.children) {
       if (child.hasAttribute("customindex")) {
         let placements = CustomizableUI.getWidgetIdsInArea(child.id);
         if (!placements.length) {
           CustomizableUI.removeExtraToolbar(child.id);
         }
       }
     }
   },
   persistCurrentSets: function(aSetBeforePersisting)  {
     let document = this.document;
     let toolbars = document.querySelectorAll("toolbar[customizable='true'][currentset]");
     for (let toolbar of toolbars) {
       if (aSetBeforePersisting) {
         let set = toolbar.currentSet;
         toolbar.setAttribute("currentset", set);
       }
       // Persist the currentset attribute directly on hardcoded toolbars.
       document.persist(toolbar.id, "currentset");
     }
   },
   reset: function() {
     this.resetting = true;
     // Disable the reset button temporarily while resetting:
     let btn = this.document.getElementById("customization-reset-button");
     BrowserUITelemetry.countCustomizationEvent("reset");
     btn.disabled = true;
     return Task.spawn(function() {
       this._removePanelCustomizationPlaceholders();
       yield this.depopulatePalette();
       yield this._unwrapToolbarItems();
       CustomizableUI.reset();
       yield this._wrapToolbarItems();
       this.populatePalette();
       this.persistCurrentSets(true);
       this._updateResetButton();
       this._updateUndoResetButton();
       this._updateEmptyPaletteNotice();
       this._showPanelCustomizationPlaceholders();
       this.resetting = false;
       if (!this._wantToBeInCustomizeMode) {
         this.exit();
       }
     }.bind(this)).then(null, ERROR);
   },
   undoReset: function() {
     this.resetting = true;
     return Task.spawn(function() {
       this._removePanelCustomizationPlaceholders();
       yield this.depopulatePalette();
       yield this._unwrapToolbarItems();
       CustomizableUI.undoReset();
       yield this._wrapToolbarItems();
       this.populatePalette();
       this.persistCurrentSets(true);
       this._updateResetButton();
       this._updateUndoResetButton();
       this._updateEmptyPaletteNotice();
       this.resetting = false;
     }.bind(this)).then(null, ERROR);
   },
   _onToolbarVisibilityChange: function(aEvent) {
     let toolbar = aEvent.target;
     if (aEvent.detail.visible && toolbar.getAttribute("customizable") == "true") {
       toolbar.setAttribute("customizing", "true");
     } else {
       toolbar.removeAttribute("customizing");
     }
     this._onUIChange();
   },
   onWidgetMoved: function(aWidgetId, aArea, aOldPosition, aNewPosition) {
     this._onUIChange();
   },
   onWidgetAdded: function(aWidgetId, aArea, aPosition) {
     this._onUIChange();
   },
   onWidgetRemoved: function(aWidgetId, aArea) {
     this._onUIChange();
   },
   onWidgetBeforeDOMChange: function(aNodeToChange, aSecondaryNode, aContainer) {
     if (aContainer.ownerDocument.defaultView != this.window || this.resetting) {
       return;
     }
     if (aContainer.id == CustomizableUI.AREA_PANEL) {
       this._removePanelCustomizationPlaceholders();
     }
     // If we get called for widgets that aren't in the window yet, they might not have
     // a parentNode at all.
     if (aNodeToChange.parentNode) {
       this.unwrapToolbarItem(aNodeToChange.parentNode);
     }
     if (aSecondaryNode) {
       this.unwrapToolbarItem(aSecondaryNode.parentNode);
     }
   },
   onWidgetAfterDOMChange: function(aNodeToChange, aSecondaryNode, aContainer) {
     if (aContainer.ownerDocument.defaultView != this.window || this.resetting) {
       return;
     }
     // If the node is still attached to the container, wrap it again:
     if (aNodeToChange.parentNode) {
       let place = CustomizableUI.getPlaceForItem(aNodeToChange);
       this.wrapToolbarItem(aNodeToChange, place);
       if (aSecondaryNode) {
         this.wrapToolbarItem(aSecondaryNode, place);
       }
     } else {
       // If not, it got removed.
       // If an API-based widget is removed while customizing, append it to the palette.
       // The _applyDrop code itself will take care of positioning it correctly, if
       // applicable. We need the code to be here so removing widgets using CustomizableUI's
       // API also does the right thing (and adds it to the palette)
       let widgetId = aNodeToChange.id;
       let widget = CustomizableUI.getWidget(widgetId);
       if (widget.provider == CustomizableUI.PROVIDER_API) {
         let paletteItem = this.makePaletteItem(widget, "palette");
         this.visiblePalette.appendChild(paletteItem);
       }
     }
     if (aContainer.id == CustomizableUI.AREA_PANEL) {
       this._showPanelCustomizationPlaceholders();
     }
   },
   onWidgetDestroyed: function(aWidgetId) {
     let wrapper = this.document.getElementById("wrapper-" + aWidgetId);
     if (wrapper) {
       let wasInPanel = wrapper.parentNode == this.panelUIContents;
       wrapper.remove();
       if (wasInPanel) {
         this._showPanelCustomizationPlaceholders();
       }
     }
   },
   onWidgetAfterCreation: function(aWidgetId, aArea) {
     // If the node was added to an area, we would have gotten an onWidgetAdded notification,
     // plus associated DOM change notifications, so only do stuff for the palette:
     if (!aArea) {
       let widgetNode = this.document.getElementById(aWidgetId);
       if (widgetNode) {
         this.wrapToolbarItem(widgetNode, "palette");
       } else {
         let widget = CustomizableUI.getWidget(aWidgetId);
         this.visiblePalette.appendChild(this.makePaletteItem(widget, "palette"));
       }
     }
   },
   onAreaNodeRegistered: function(aArea, aContainer) {
     if (aContainer.ownerDocument == this.document) {
       this._wrapItemsInArea(aContainer);
       this._addDragHandlers(aContainer);
       DragPositionManager.add(this.window, aArea, aContainer);
       this.areas.push(aContainer);
     }
   },
   onAreaNodeUnregistered: function(aArea, aContainer, aReason) {
     if (aContainer.ownerDocument == this.document && aReason == CustomizableUI.REASON_AREA_UNREGISTERED) {
       this._unwrapItemsInArea(aContainer);
       this._removeDragHandlers(aContainer);
       DragPositionManager.remove(this.window, aArea, aContainer);
       let index = this.areas.indexOf(aContainer);
       this.areas.splice(index, 1);
     }
   },
   _onUIChange: function() {
     this._changed = true;
     if (!this.resetting) {
       this._updateResetButton();
       this._updateUndoResetButton();
       this._updateEmptyPaletteNotice();
     }
     CustomizableUI.dispatchToolboxEvent("customizationchange");
   },
   _updateEmptyPaletteNotice: function() {
     let paletteItems = this.visiblePalette.getElementsByTagName("toolbarpaletteitem");
     this.paletteEmptyNotice.hidden = !!paletteItems.length;
   },
   _updateResetButton: function() {
     let btn = this.document.getElementById("customization-reset-button");
     btn.disabled = CustomizableUI.inDefaultState;
   },
   _updateUndoResetButton: function() {
     let undoResetButton =  this.document.getElementById("customization-undo-reset-button");
     undoResetButton.hidden = !CustomizableUI.canUndoReset;
   },
   handleEvent: function(aEvent) {
     switch(aEvent.type) {
       case "toolbarvisibilitychange":
         this._onToolbarVisibilityChange(aEvent);
         break;
       case "dragstart":
         this._onDragStart(aEvent);
         break;
       case "dragover":
         this._onDragOver(aEvent);
         break;
       case "drop":
         this._onDragDrop(aEvent);
         break;
       case "dragexit":
         this._onDragExit(aEvent);
         break;
       case "dragend":
         this._onDragEnd(aEvent);
         break;
       case "command":
         if (aEvent.originalTarget == this.window.PanelUI.menuButton) {
           this.exit();
           aEvent.preventDefault();
         }
         break;
       case "mousedown":
         this._onMouseDown(aEvent);
         break;
       case "mouseup":
         this._onMouseUp(aEvent);
         break;
       case "keypress":
         if (aEvent.keyCode == aEvent.DOM_VK_ESCAPE) {
           this.exit();
         }
         break;
 #ifdef CAN_DRAW_IN_TITLEBAR
       case "unload":
         this.uninit();
         break;
 #endif
     }
   },
 #ifdef CAN_DRAW_IN_TITLEBAR
   observe: function(aSubject, aTopic, aData) {
     switch (aTopic) {
       case "nsPref:changed":
         this._updateResetButton();
         this._updateTitlebarButton();
         this._updateUndoResetButton();
         break;
     }
   },
   _updateTitlebarButton: function() {
     let drawInTitlebar = true;
     try {
       drawInTitlebar = Services.prefs.getBoolPref(kDrawInTitlebarPref);
     } catch (ex) { }
     let button = this.document.getElementById("customization-titlebar-visibility-button");
     // Drawing in the titlebar means 'hiding' the titlebar:
     if (drawInTitlebar) {
       button.removeAttribute("checked");
     } else {
       button.setAttribute("checked", "true");
     }
   },
   toggleTitlebar: function(aShouldShowTitlebar) {
     // Drawing in the titlebar means not showing the titlebar, hence the negation:
     Services.prefs.setBoolPref(kDrawInTitlebarPref, !aShouldShowTitlebar);
   },
 #endif
   _onDragStart: function(aEvent) {
     __dumpDragData(aEvent);
     let item = aEvent.target;
     while (item && item.localName != "toolbarpaletteitem") {
       if (item.localName == "toolbar") {
         return;
       }
       item = item.parentNode;
     }
     let draggedItem = item.firstChild;
     let placeForItem = CustomizableUI.getPlaceForItem(item);
     let isRemovable = placeForItem == "palette" ||
                       CustomizableUI.isWidgetRemovable(draggedItem);
     if (item.classList.contains(kPlaceholderClass) || !isRemovable) {
       return;
     }
     let dt = aEvent.dataTransfer;
     let documentId = aEvent.target.ownerDocument.documentElement.id;
     let isInToolbar = placeForItem == "toolbar";
     dt.mozSetDataAt(kDragDataTypePrefix + documentId, draggedItem.id, 0);
     dt.effectAllowed = "move";
     let itemRect = draggedItem.getBoundingClientRect();
     let itemCenter = {x: itemRect.left + itemRect.width / 2,
                       y: itemRect.top + itemRect.height / 2};
     this._dragOffset = {x: aEvent.clientX - itemCenter.x,
                         y: aEvent.clientY - itemCenter.y};
     gDraggingInToolbars = new Set();
     // Hack needed so that the dragimage will still show the
     // item as it appeared before it was hidden.
     this._initializeDragAfterMove = function() {
       // For automated tests, we sometimes start exiting customization mode
       // before this fires, which leaves us with placeholders inserted after
       // we've exited. So we need to check that we are indeed customizing.
       if (this._customizing && !this._transitioning) {
         item.hidden = true;
         this._showPanelCustomizationPlaceholders();
         DragPositionManager.start(this.window);
         if (item.nextSibling) {
           this._setDragActive(item.nextSibling, "before", draggedItem.id, isInToolbar);
           this._dragOverItem = item.nextSibling;
         } else if (isInToolbar && item.previousSibling) {
           this._setDragActive(item.previousSibling, "after", draggedItem.id, isInToolbar);
           this._dragOverItem = item.previousSibling;
         }
       }
       this._initializeDragAfterMove = null;
       this.window.clearTimeout(this._dragInitializeTimeout);
     }.bind(this);
     this._dragInitializeTimeout = this.window.setTimeout(this._initializeDragAfterMove, 0);
   },
   _onDragOver: function(aEvent) {
     if (this._isUnwantedDragDrop(aEvent)) {
       return;
     }
     if (this._initializeDragAfterMove) {
       this._initializeDragAfterMove();
     }
     __dumpDragData(aEvent);
     let document = aEvent.target.ownerDocument;
     let documentId = document.documentElement.id;
     if (!aEvent.dataTransfer.mozTypesAt(0)) {
       return;
     }
     let draggedItemId =
       aEvent.dataTransfer.mozGetDataAt(kDragDataTypePrefix + documentId, 0);
     let draggedWrapper = document.getElementById("wrapper-" + draggedItemId);
     let targetArea = this._getCustomizableParent(aEvent.currentTarget);
     let originArea = this._getCustomizableParent(draggedWrapper);
     // Do nothing if the target or origin are not customizable.
     if (!targetArea || !originArea) {
       return;
     }
     // Do nothing if the widget is not allowed to be removed.
     if (targetArea.id == kPaletteId &&
        !CustomizableUI.isWidgetRemovable(draggedItemId)) {
       return;
     }
     // Do nothing if the widget is not allowed to move to the target area.
     if (targetArea.id != kPaletteId &&
         !CustomizableUI.canWidgetMoveToArea(draggedItemId, targetArea.id)) {
       return;
     }
     let targetIsToolbar = CustomizableUI.getAreaType(targetArea.id) == "toolbar";
     let targetNode = this._getDragOverNode(aEvent, targetArea, targetIsToolbar, draggedItemId);
     // We need to determine the place that the widget is being dropped in
     // the target.
     let dragOverItem, dragValue;
     if (targetNode == targetArea.customizationTarget) {
       // We'll assume if the user is dragging directly over the target, that
       // they're attempting to append a child to that target.
       dragOverItem = (targetIsToolbar ? this._findVisiblePreviousSiblingNode(targetNode.lastChild) :
                                         targetNode.lastChild) || targetNode;
       dragValue = "after";
     } else {
       let targetParent = targetNode.parentNode;
       let position = Array.indexOf(targetParent.children, targetNode);
       if (position == -1) {
         dragOverItem = targetIsToolbar ? this._findVisiblePreviousSiblingNode(targetNode.lastChild) :
                                          targetParent.lastChild;
         dragValue = "after";
       } else {
         dragOverItem = targetParent.children[position];
         if (!targetIsToolbar) {
           dragValue = "before";
         } else {
           dragOverItem = this._findVisiblePreviousSiblingNode(targetParent.children[position]);
           // Check if the aDraggedItem is hovered past the first half of dragOverItem
           let window = dragOverItem.ownerDocument.defaultView;
           let direction = window.getComputedStyle(dragOverItem, null).direction;
           let itemRect = dragOverItem.getBoundingClientRect();
           let dropTargetCenter = itemRect.left + (itemRect.width / 2);
           let existingDir = dragOverItem.getAttribute("dragover");
           if ((existingDir == "before") == (direction == "ltr")) {
             dropTargetCenter += (parseInt(dragOverItem.style.borderLeftWidth) || 0) / 2;
           } else {
             dropTargetCenter -= (parseInt(dragOverItem.style.borderRightWidth) || 0) / 2;
           }
           let before = direction == "ltr" ? aEvent.clientX < dropTargetCenter : aEvent.clientX > dropTargetCenter;
           dragValue = before ? "before" : "after";
         }
       }
     }
     if (this._dragOverItem && dragOverItem != this._dragOverItem) {
       this._cancelDragActive(this._dragOverItem, dragOverItem);
     }
     if (dragOverItem != this._dragOverItem || dragValue != dragOverItem.getAttribute("dragover")) {
       if (dragOverItem != targetArea.customizationTarget) {
         this._setDragActive(dragOverItem, dragValue, draggedItemId, targetIsToolbar);
       } else if (targetIsToolbar) {
         this._updateToolbarCustomizationOutline(this.window, targetArea);
       }
       this._dragOverItem = dragOverItem;
     }
     aEvent.preventDefault();
     aEvent.stopPropagation();
   },
   _onDragDrop: function(aEvent) {
     if (this._isUnwantedDragDrop(aEvent)) {
       return;
     }
     __dumpDragData(aEvent);
     this._initializeDragAfterMove = null;
     this.window.clearTimeout(this._dragInitializeTimeout);
     let targetArea = this._getCustomizableParent(aEvent.currentTarget);
     let document = aEvent.target.ownerDocument;
     let documentId = document.documentElement.id;
     let draggedItemId =
       aEvent.dataTransfer.mozGetDataAt(kDragDataTypePrefix + documentId, 0);
     let draggedWrapper = document.getElementById("wrapper-" + draggedItemId);
     let originArea = this._getCustomizableParent(draggedWrapper);
     if (this._dragSizeMap) {
       this._dragSizeMap.clear();
     }
     // Do nothing if the target area or origin area are not customizable.
     if (!targetArea || !originArea) {
       return;
     }
     let targetNode = this._dragOverItem;
     let dropDir = targetNode.getAttribute("dragover");
     // Need to insert *after* this node if we promised the user that:
     if (targetNode != targetArea && dropDir == "after") {
       if (targetNode.nextSibling) {
         targetNode = targetNode.nextSibling;
       } else {
         targetNode = targetArea;
       }
     }
     // If the target node is a placeholder, get its sibling as the real target.
     while (targetNode.classList.contains(kPlaceholderClass) && targetNode.nextSibling) {
       targetNode = targetNode.nextSibling;
     }
     if (targetNode.tagName == "toolbarpaletteitem") {
       targetNode = targetNode.firstChild;
     }
     this._cancelDragActive(this._dragOverItem, null, true);
     this._removePanelCustomizationPlaceholders();
     try {
       this._applyDrop(aEvent, targetArea, originArea, draggedItemId, targetNode);
     } catch (ex) {
       ERROR(ex, ex.stack);
     }
     this._showPanelCustomizationPlaceholders();
   },
   _applyDrop: function(aEvent, aTargetArea, aOriginArea, aDraggedItemId, aTargetNode) {
     let document = aEvent.target.ownerDocument;
     let draggedItem = document.getElementById(aDraggedItemId);
     draggedItem.hidden = false;
     draggedItem.removeAttribute("mousedown");
     // Do nothing if the target was dropped onto itself (ie, no change in area
     // or position).
     if (draggedItem == aTargetNode) {
       return;
     }
     // Is the target area the customization palette?
     if (aTargetArea.id == kPaletteId) {
       // Did we drag from outside the palette?
       if (aOriginArea.id !== kPaletteId) {
         if (!CustomizableUI.isWidgetRemovable(aDraggedItemId)) {
           return;
         }
         CustomizableUI.removeWidgetFromArea(aDraggedItemId);
         BrowserUITelemetry.countCustomizationEvent("remove");
         // Special widgets are removed outright, we can return here:
         if (CustomizableUI.isSpecialWidget(aDraggedItemId)) {
           return;
         }
       }
       draggedItem = draggedItem.parentNode;
       // If the target node is the palette itself, just append
       if (aTargetNode == this.visiblePalette) {
         this.visiblePalette.appendChild(draggedItem);
       } else {
         // The items in the palette are wrapped, so we need the target node's parent here:
         this.visiblePalette.insertBefore(draggedItem, aTargetNode.parentNode);
       }
       if (aOriginArea.id !== kPaletteId) {
         // The dragend event already fires when the item moves within the palette.
         this._onDragEnd(aEvent);
       }
       return;
     }
     if (!CustomizableUI.canWidgetMoveToArea(aDraggedItemId, aTargetArea.id)) {
       return;
     }
     // Skipintoolbarset items won't really be moved:
     if (draggedItem.getAttribute("skipintoolbarset") == "true") {
       // These items should never leave their area:
       if (aTargetArea != aOriginArea) {
         return;
       }
       let place = draggedItem.parentNode.getAttribute("place");
       this.unwrapToolbarItem(draggedItem.parentNode);
       if (aTargetNode == aTargetArea.customizationTarget) {
         aTargetArea.customizationTarget.appendChild(draggedItem);
       } else {
         this.unwrapToolbarItem(aTargetNode.parentNode);
         aTargetArea.customizationTarget.insertBefore(draggedItem, aTargetNode);
         this.wrapToolbarItem(aTargetNode, place);
       }
       this.wrapToolbarItem(draggedItem, place);
       BrowserUITelemetry.countCustomizationEvent("move");
       return;
     }
     // Is the target the customization area itself? If so, we just add the
     // widget to the end of the area.
     if (aTargetNode == aTargetArea.customizationTarget) {
       CustomizableUI.addWidgetToArea(aDraggedItemId, aTargetArea.id);
       // For the purposes of BrowserUITelemetry, we consider both moving a widget
       // within the same area, and adding a widget from one area to another area
       // as a "move". An "add" is only when we move an item from the palette into
       // an area.
       let custEventType = aOriginArea.id == kPaletteId ? "add" : "move";
       BrowserUITelemetry.countCustomizationEvent(custEventType);
       this._onDragEnd(aEvent);
       return;
     }
     // We need to determine the place that the widget is being dropped in
     // the target.
     let placement;
     let itemForPlacement = aTargetNode;
     // Skip the skipintoolbarset items when determining the place of the item:
     while (itemForPlacement && itemForPlacement.getAttribute("skipintoolbarset") == "true" &&
            itemForPlacement.parentNode &&
            itemForPlacement.parentNode.nodeName == "toolbarpaletteitem") {
       itemForPlacement = itemForPlacement.parentNode.nextSibling;
       if (itemForPlacement && itemForPlacement.nodeName == "toolbarpaletteitem") {
         itemForPlacement = itemForPlacement.firstChild;
       }
     }
     if (itemForPlacement && !itemForPlacement.classList.contains(kPlaceholderClass)) {
       let targetNodeId = (itemForPlacement.nodeName == "toolbarpaletteitem") ?
                             itemForPlacement.firstChild && itemForPlacement.firstChild.id :
                             itemForPlacement.id;
       placement = CustomizableUI.getPlacementOfWidget(targetNodeId);
     }
     if (!placement) {
       LOG("Could not get a position for " + aTargetNode.nodeName + "#" + aTargetNode.id + "." + aTargetNode.className);
     }
     let position = placement ? placement.position : null;
     // Is the target area the same as the origin? Since we've already handled
     // the possibility that the target is the customization palette, we know
     // that the widget is moving within a customizable area.
     if (aTargetArea == aOriginArea) {
       CustomizableUI.moveWidgetWithinArea(aDraggedItemId, position);
     } else {
       CustomizableUI.addWidgetToArea(aDraggedItemId, aTargetArea.id, position);
     }
     this._onDragEnd(aEvent);
     // For BrowserUITelemetry, an "add" is only when we move an item from the palette
     // into an area. Otherwise, it's a move.
     let custEventType = aOriginArea.id == kPaletteId ? "add" : "move";
     BrowserUITelemetry.countCustomizationEvent(custEventType);
     // If we dropped onto a skipintoolbarset item, manually correct the drop location:
     if (aTargetNode != itemForPlacement) {
       let draggedWrapper = draggedItem.parentNode;
       let container = draggedWrapper.parentNode;
       container.insertBefore(draggedWrapper, aTargetNode.parentNode);
     }
   },
   _onDragExit: function(aEvent) {
     if (this._isUnwantedDragDrop(aEvent)) {
       return;
     }
     __dumpDragData(aEvent);
     // When leaving customization areas, cancel the drag on the last dragover item
     // We've attached the listener to areas, so aEvent.currentTarget will be the area.
     // We don't care about dragexit events fired on descendants of the area,
     // so we check that the event's target is the same as the area to which the listener
     // was attached.
     if (this._dragOverItem && aEvent.target == aEvent.currentTarget) {
       this._cancelDragActive(this._dragOverItem);
       this._dragOverItem = null;
     }
   },
   /**
    * To workaround bug 460801 we manually forward the drop event here when dragend wouldn't be fired.
    */
   _onDragEnd: function(aEvent) {
     if (this._isUnwantedDragDrop(aEvent)) {
       return;
     }
     this._initializeDragAfterMove = null;
     this.window.clearTimeout(this._dragInitializeTimeout);
     __dumpDragData(aEvent, "_onDragEnd");
     let document = aEvent.target.ownerDocument;
     document.documentElement.removeAttribute("customizing-movingItem");
     let documentId = document.documentElement.id;
     if (!aEvent.dataTransfer.mozTypesAt(0)) {
       return;
     }
     let draggedItemId =
       aEvent.dataTransfer.mozGetDataAt(kDragDataTypePrefix + documentId, 0);
     let draggedWrapper = document.getElementById("wrapper-" + draggedItemId);
     draggedWrapper.hidden = false;
     draggedWrapper.removeAttribute("mousedown");
     if (this._dragOverItem) {
       this._cancelDragActive(this._dragOverItem);
       this._dragOverItem = null;
     }
     this._updateToolbarCustomizationOutline(this.window);
     this._showPanelCustomizationPlaceholders();
     DragPositionManager.stop();
   },
   _isUnwantedDragDrop: function(aEvent) {
     // The simulated events generated by synthesizeDragStart/synthesizeDrop in
     // mochitests are used only for testing whether the right data is being put
     // into the dataTransfer. Neither cause a real drop to occur, so they don't
     // set the source node. There isn't a means of testing real drag and drops,
     // so this pref skips the check but it should only be set by test code.
     if (this._skipSourceNodeCheck) {
       return false;
     }
     /* Discard drag events that originated from a separate window to
        prevent content->chrome privilege escalations. */
     let mozSourceNode = aEvent.dataTransfer.mozSourceNode;
     // mozSourceNode is null in the dragStart event handler or if
     // the drag event originated in an external application.
     return !mozSourceNode ||
            mozSourceNode.ownerDocument.defaultView != this.window;
   },
   _setDragActive: function(aItem, aValue, aDraggedItemId, aInToolbar) {
     if (!aItem) {
       return;
     }
     if (aItem.getAttribute("dragover") != aValue) {
       aItem.setAttribute("dragover", aValue);
       let window = aItem.ownerDocument.defaultView;
       let draggedItem = window.document.getElementById(aDraggedItemId);
       if (!aInToolbar) {
         this._setGridDragActive(aItem, draggedItem, aValue);
       } else {
         let targetArea = this._getCustomizableParent(aItem);
         this._updateToolbarCustomizationOutline(window, targetArea);
         let makeSpaceImmediately = false;
         if (!gDraggingInToolbars.has(targetArea.id)) {
           gDraggingInToolbars.add(targetArea.id);
           let draggedWrapper = this.document.getElementById("wrapper-" + aDraggedItemId);
           let originArea = this._getCustomizableParent(draggedWrapper);
           makeSpaceImmediately = originArea == targetArea;
         }
         // Calculate width of the item when it'd be dropped in this position
         let width = this._getDragItemSize(aItem, draggedItem).width;
         let direction = window.getComputedStyle(aItem).direction;
         let prop, otherProp;
         // If we're inserting before in ltr, or after in rtl:
         if ((aValue == "before") == (direction == "ltr")) {
           prop = "borderLeftWidth";
           otherProp = "border-right-width";
         } else {
           // otherwise:
           prop = "borderRightWidth";
           otherProp = "border-left-width";
         }
         if (makeSpaceImmediately) {
           aItem.setAttribute("notransition", "true");
         }
         aItem.style[prop] = width + 'px';
         aItem.style.removeProperty(otherProp);
         if (makeSpaceImmediately) {
           // Force a layout flush:
           aItem.getBoundingClientRect();
           aItem.removeAttribute("notransition");
         }
       }
     }
   },
   _cancelDragActive: function(aItem, aNextItem, aNoTransition) {
     this._updateToolbarCustomizationOutline(aItem.ownerDocument.defaultView);
     let currentArea = this._getCustomizableParent(aItem);
     if (!currentArea) {
       return;
     }
     let isToolbar = CustomizableUI.getAreaType(currentArea.id) == "toolbar";
     if (isToolbar) {
       if (aNoTransition) {
         aItem.setAttribute("notransition", "true");
       }
       aItem.removeAttribute("dragover");
       // Remove both property values in the case that the end padding
       // had been set.
       aItem.style.removeProperty("border-left-width");
       aItem.style.removeProperty("border-right-width");
       if (aNoTransition) {
         // Force a layout flush:
         aItem.getBoundingClientRect();
         aItem.removeAttribute("notransition");
       }
     } else  {
       aItem.removeAttribute("dragover");
       if (aNextItem) {
         let nextArea = this._getCustomizableParent(aNextItem);
         if (nextArea == currentArea) {
           // No need to do anything if we're still dragging in this area:
           return;
         }
       }
       // Otherwise, clear everything out:
       let positionManager = DragPositionManager.getManagerForArea(currentArea);
       positionManager.clearPlaceholders(currentArea, aNoTransition);
     }
   },
   _setGridDragActive: function(aDragOverNode, aDraggedItem, aValue) {
     let targetArea = this._getCustomizableParent(aDragOverNode);
     let draggedWrapper = this.document.getElementById("wrapper-" + aDraggedItem.id);
     let originArea = this._getCustomizableParent(draggedWrapper);
     let positionManager = DragPositionManager.getManagerForArea(targetArea);
     let draggedSize = this._getDragItemSize(aDragOverNode, aDraggedItem);
     let isWide = aDraggedItem.classList.contains(CustomizableUI.WIDE_PANEL_CLASS);
     positionManager.insertPlaceholder(targetArea, aDragOverNode, isWide, draggedSize,
                                       originArea == targetArea);
   },
   _getDragItemSize: function(aDragOverNode, aDraggedItem) {
     // Cache it good, cache it real good.
     if (!this._dragSizeMap)
       this._dragSizeMap = new WeakMap();
     if (!this._dragSizeMap.has(aDraggedItem))
       this._dragSizeMap.set(aDraggedItem, new WeakMap());
     let itemMap = this._dragSizeMap.get(aDraggedItem);
     let targetArea = this._getCustomizableParent(aDragOverNode);
     let currentArea = this._getCustomizableParent(aDraggedItem);
     // Return the size for this target from cache, if it exists.
     let size = itemMap.get(targetArea);
     if (size)
       return size;
     // Calculate size of the item when it'd be dropped in this position.
     let currentParent = aDraggedItem.parentNode;
     let currentSibling = aDraggedItem.nextSibling;
     const kAreaType = "cui-areatype";
     let areaType, currentType;
     if (targetArea != currentArea) {
       // Move the widget temporarily next to the placeholder.
       aDragOverNode.parentNode.insertBefore(aDraggedItem, aDragOverNode);
       // Update the node's areaType.
       areaType = CustomizableUI.getAreaType(targetArea.id);
       currentType = aDraggedItem.hasAttribute(kAreaType) &&
                     aDraggedItem.getAttribute(kAreaType);
       if (areaType)
         aDraggedItem.setAttribute(kAreaType, areaType);
       this.wrapToolbarItem(aDraggedItem, areaType || "palette");
       CustomizableUI.onWidgetDrag(aDraggedItem.id, targetArea.id);
     } else {
       aDraggedItem.parentNode.hidden = false;
     }
     // Fetch the new size.
     let rect = aDraggedItem.parentNode.getBoundingClientRect();
     size = {width: rect.width, height: rect.height};
     // Cache the found value of size for this target.
     itemMap.set(targetArea, size);
     if (targetArea != currentArea) {
       this.unwrapToolbarItem(aDraggedItem.parentNode);
       // Put the item back into its previous position.
       currentParent.insertBefore(aDraggedItem, currentSibling);
       // restore the areaType
       if (areaType) {
         if (currentType === false)
           aDraggedItem.removeAttribute(kAreaType);
         else
           aDraggedItem.setAttribute(kAreaType, currentType);
       }
       this.createOrUpdateWrapper(aDraggedItem, null, true);
       CustomizableUI.onWidgetDrag(aDraggedItem.id);
     } else {
       aDraggedItem.parentNode.hidden = true;
     }
     return size;
   },
   _getCustomizableParent: function(aElement) {
     let areas = CustomizableUI.areas;
     areas.push(kPaletteId);
     while (aElement) {
       if (areas.indexOf(aElement.id) != -1) {
         return aElement;
       }
       aElement = aElement.parentNode;
     }
     return null;
   },
   _getDragOverNode: function(aEvent, aAreaElement, aInToolbar, aDraggedItemId) {
     let expectedParent = aAreaElement.customizationTarget || aAreaElement;
     // Our tests are stupid. Cope:
     if (!aEvent.clientX  && !aEvent.clientY) {
       return aEvent.target;
     }
     // Offset the drag event's position with the offset to the center of
     // the thing we're dragging
     let dragX = aEvent.clientX - this._dragOffset.x;
     let dragY = aEvent.clientY - this._dragOffset.y;
     // Ensure this is within the container
     let boundsContainer = expectedParent;
     // NB: because the panel UI itself is inside a scrolling container, we need
     // to use the parent bounds (otherwise, if the panel UI is scrolled down,
     // the numbers we get are in window coordinates which leads to various kinds
     // of weirdness)
     if (boundsContainer == this.panelUIContents) {
       boundsContainer = boundsContainer.parentNode;
     }
     let bounds = boundsContainer.getBoundingClientRect();
     dragX = Math.min(bounds.right, Math.max(dragX, bounds.left));
     dragY = Math.min(bounds.bottom, Math.max(dragY, bounds.top));
     let targetNode;
     if (aInToolbar) {
       targetNode = aAreaElement.ownerDocument.elementFromPoint(dragX, dragY);
       while (targetNode && targetNode.parentNode != expectedParent) {
         targetNode = targetNode.parentNode;
       }
     } else {
       let positionManager = DragPositionManager.getManagerForArea(aAreaElement);
       // Make it relative to the container:
       dragX -= bounds.left;
       // NB: but if we're in the panel UI, we need to use the actual panel
       // contents instead of the scrolling container to determine our origin
       // offset against:
       if (expectedParent == this.panelUIContents) {
         dragY -= this.panelUIContents.getBoundingClientRect().top;
       } else {
         dragY -= bounds.top;
       }
       // Find the closest node:
       targetNode = positionManager.find(aAreaElement, dragX, dragY, aDraggedItemId);
     }
     return targetNode || aEvent.target;
   },
   _onMouseDown: function(aEvent) {
     LOG("_onMouseDown");
     if (aEvent.button != 0) {
       return;
     }
     let doc = aEvent.target.ownerDocument;
     doc.documentElement.setAttribute("customizing-movingItem", true);
     let item = this._getWrapper(aEvent.target);
     if (item && !item.classList.contains(kPlaceholderClass) &&
         item.getAttribute("removable") == "true") {
       item.setAttribute("mousedown", "true");
     }
   },
   _onMouseUp: function(aEvent) {
     LOG("_onMouseUp");
     if (aEvent.button != 0) {
       return;
     }
     let doc = aEvent.target.ownerDocument;
     doc.documentElement.removeAttribute("customizing-movingItem");
     let item = this._getWrapper(aEvent.target);
     if (item) {
       item.removeAttribute("mousedown");
     }
   },
   _getWrapper: function(aElement) {
     while (aElement && aElement.localName != "toolbarpaletteitem") {
       if (aElement.localName == "toolbar")
         return null;
       aElement = aElement.parentNode;
     }
     return aElement;
   },
   _showPanelCustomizationPlaceholders: function() {
     let doc = this.document;
     let contents = this.panelUIContents;
     let narrowItemsAfterWideItem = 0;
     let node = contents.lastChild;
     while (node && !node.classList.contains(CustomizableUI.WIDE_PANEL_CLASS) &&
            (!node.firstChild || !node.firstChild.classList.contains(CustomizableUI.WIDE_PANEL_CLASS))) {
       if (!node.hidden && !node.classList.contains(kPlaceholderClass)) {
         narrowItemsAfterWideItem++;
       }
       node = node.previousSibling;
     }
     let orphanedItems = narrowItemsAfterWideItem % CustomizableUI.PANEL_COLUMN_COUNT;
     let placeholders = CustomizableUI.PANEL_COLUMN_COUNT - orphanedItems;
     let currentPlaceholderCount = contents.querySelectorAll("." + kPlaceholderClass).length;
     if (placeholders > currentPlaceholderCount) {
       while (placeholders-- > currentPlaceholderCount) {
         let placeholder = doc.createElement("toolbarpaletteitem");
         placeholder.classList.add(kPlaceholderClass);
         //XXXjaws The toolbarbutton child here is only necessary to get
         //  the styling right here.
         let placeholderChild = doc.createElement("toolbarbutton");
         placeholderChild.classList.add(kPlaceholderClass + "-child");
         placeholder.appendChild(placeholderChild);
         contents.appendChild(placeholder);
       }
     } else if (placeholders < currentPlaceholderCount) {
       while (placeholders++ < currentPlaceholderCount) {
         contents.querySelectorAll("." + kPlaceholderClass)[0].remove();
       }
     }
   },
   _removePanelCustomizationPlaceholders: function() {
     let contents = this.panelUIContents;
     let oldPlaceholders = contents.getElementsByClassName(kPlaceholderClass);
     while (oldPlaceholders.length) {
       contents.removeChild(oldPlaceholders[0]);
     }
   },
   /**
    * Update toolbar customization targets during drag events to add or remove
    * outlines to indicate that an area is customizable.
    *
    * @param aWindow                       The XUL window in which outlines should be updated.
    * @param {Element} [aToolbarArea=null] The element of the customizable toolbar area to add the
    *                                      outline to. If aToolbarArea is falsy, the outline will be
    *                                      removed from all toolbar areas.
    */
   _updateToolbarCustomizationOutline: function(aWindow, aToolbarArea = null) {
     // Remove the attribute from existing customization targets
     for (let area of CustomizableUI.areas) {
       if (CustomizableUI.getAreaType(area) != CustomizableUI.TYPE_TOOLBAR) {
         continue;
       }
       let target = CustomizableUI.getCustomizeTargetForArea(area, aWindow);
       target.removeAttribute("customizing-dragovertarget");
     }
     // Now set the attribute on the desired target
     if (aToolbarArea) {
       if (CustomizableUI.getAreaType(aToolbarArea.id) != CustomizableUI.TYPE_TOOLBAR)
         return;
       let target = CustomizableUI.getCustomizeTargetForArea(aToolbarArea.id, aWindow);
       target.setAttribute("customizing-dragovertarget", true);
     }
   },
   _findVisiblePreviousSiblingNode: function(aReferenceNode) {
     while (aReferenceNode &&
            aReferenceNode.localName == "toolbarpaletteitem" &&
            aReferenceNode.firstChild.hidden) {
       aReferenceNode = aReferenceNode.previousSibling;
     }
     return aReferenceNode;
   },
 };
 function __dumpDragData(aEvent, caller) {
   if (!gDebug) {
     return;
   }
   let str = "Dumping drag data (" + (caller ? caller + " in " : "") + "CustomizeMode.jsm) {\n";
   str += "  type: " + aEvent["type"] + "\n";
   for (let el of ["target", "currentTarget", "relatedTarget"]) {
     if (aEvent[el]) {
       str += "  " + el + ": " + aEvent[el] + "(localName=" + aEvent[el].localName + "; id=" + aEvent[el].id + ")\n";
     }
   }
   for (let prop in aEvent.dataTransfer) {
     if (typeof aEvent.dataTransfer[prop] != "function") {
       str += "  dataTransfer[" + prop + "]: " + aEvent.dataTransfer[prop] + "\n";
     }
   }
   str += "}";
   LOG(str);
 }
 function dispatchFunction(aFunc) {
   Services.tm.currentThread.dispatch(aFunc, Ci.nsIThread.DISPATCH_NORMAL);
 }

The Tor Browser / annotate

browser/components/customizableui/src/CustomizeMode.jsm@8bccb770b82d (annotated)

browser/components/customizableui/src/CustomizeMode.jsm