The Tor Browser: browser/base/content/browser-social.js@6474c204b198 (annotated)

browser/base/content/browser-social.js@6474c204b198 (annotated)

browser/base/content/browser-social.js

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // 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/.
 // the "exported" symbols
 let SocialUI,
     SocialChatBar,
     SocialFlyout,
     SocialMarks,
     SocialShare,
     SocialSidebar,
     SocialStatus;
 (function() {
 // The minimum sizes for the auto-resize panel code.
 const PANEL_MIN_HEIGHT = 100;
 const PANEL_MIN_WIDTH = 330;
 XPCOMUtils.defineLazyModuleGetter(this, "SharedFrame",
   "resource:///modules/SharedFrame.jsm");
 XPCOMUtils.defineLazyGetter(this, "OpenGraphBuilder", function() {
   let tmp = {};
   Cu.import("resource:///modules/Social.jsm", tmp);
   return tmp.OpenGraphBuilder;
 });
 XPCOMUtils.defineLazyGetter(this, "DynamicResizeWatcher", function() {
   let tmp = {};
   Cu.import("resource:///modules/Social.jsm", tmp);
   return tmp.DynamicResizeWatcher;
 });
 XPCOMUtils.defineLazyGetter(this, "sizeSocialPanelToContent", function() {
   let tmp = {};
   Cu.import("resource:///modules/Social.jsm", tmp);
   return tmp.sizeSocialPanelToContent;
 });
 XPCOMUtils.defineLazyGetter(this, "CreateSocialStatusWidget", function() {
   let tmp = {};
   Cu.import("resource:///modules/Social.jsm", tmp);
   return tmp.CreateSocialStatusWidget;
 });
 XPCOMUtils.defineLazyGetter(this, "CreateSocialMarkWidget", function() {
   let tmp = {};
   Cu.import("resource:///modules/Social.jsm", tmp);
   return tmp.CreateSocialMarkWidget;
 });
 SocialUI = {
   _initialized: false,
   // Called on delayed startup to initialize the UI
   init: function SocialUI_init() {
     if (this._initialized) {
       return;
     }
     Services.obs.addObserver(this, "social:ambient-notification-changed", false);
     Services.obs.addObserver(this, "social:profile-changed", false);
     Services.obs.addObserver(this, "social:frameworker-error", false);
     Services.obs.addObserver(this, "social:providers-changed", false);
     Services.obs.addObserver(this, "social:provider-reload", false);
     Services.obs.addObserver(this, "social:provider-enabled", false);
     Services.obs.addObserver(this, "social:provider-disabled", false);
     Services.prefs.addObserver("social.toast-notifications.enabled", this, false);
     gBrowser.addEventListener("ActivateSocialFeature", this._activationEventHandler.bind(this), true, true);
     document.getElementById("PanelUI-popup").addEventListener("popupshown", SocialMarks.updatePanelButtons, true);
     // menupopups that list social providers. we only populate them when shown,
     // and if it has not been done already.
     document.getElementById("viewSidebarMenu").addEventListener("popupshowing", SocialSidebar.populateSidebarMenu, true);
     document.getElementById("social-statusarea-popup").addEventListener("popupshowing", SocialSidebar.populateSidebarMenu, true);
     Social.init().then((update) => {
       if (update)
         this._providersChanged();
       // handle SessionStore for the sidebar state
       SocialSidebar.restoreWindowState();
     });
     this._initialized = true;
   },
   // Called on window unload
   uninit: function SocialUI_uninit() {
     if (!this._initialized) {
       return;
     }
     SocialSidebar.saveWindowState();
     Services.obs.removeObserver(this, "social:ambient-notification-changed");
     Services.obs.removeObserver(this, "social:profile-changed");
     Services.obs.removeObserver(this, "social:frameworker-error");
     Services.obs.removeObserver(this, "social:providers-changed");
     Services.obs.removeObserver(this, "social:provider-reload");
     Services.obs.removeObserver(this, "social:provider-enabled");
     Services.obs.removeObserver(this, "social:provider-disabled");
     Services.prefs.removeObserver("social.toast-notifications.enabled", this);
     document.getElementById("PanelUI-popup").removeEventListener("popupshown", SocialMarks.updatePanelButtons, true);
     document.getElementById("viewSidebarMenu").removeEventListener("popupshowing", SocialSidebar.populateSidebarMenu, true);
     document.getElementById("social-statusarea-popup").removeEventListener("popupshowing", SocialSidebar.populateSidebarMenu, true);
     this._initialized = false;
   },
   observe: function SocialUI_observe(subject, topic, data) {
     // Exceptions here sometimes don't get reported properly, report them
     // manually :(
     try {
       switch (topic) {
         case "social:provider-enabled":
           SocialMarks.populateToolbarPalette();
           SocialStatus.populateToolbarPalette();
           break;
         case "social:provider-disabled":
           SocialMarks.removeProvider(data);
           SocialStatus.removeProvider(data);
           SocialSidebar.disableProvider(data);
           break;
         case "social:provider-reload":
           SocialStatus.reloadProvider(data);
           // if the reloaded provider is our current provider, fall through
           // to social:providers-changed so the ui will be reset
           if (!SocialSidebar.provider || SocialSidebar.provider.origin != data)
             return;
           // currently only the sidebar and flyout have a selected provider.
           // sidebar provider has changed (possibly to null), ensure the content
           // is unloaded and the frames are reset, they will be loaded in
           // providers-changed below if necessary.
           SocialSidebar.unloadSidebar();
           SocialFlyout.unload();
           // fall through to providers-changed to ensure the reloaded provider
           // is correctly reflected in any UI and the multi-provider menu
         case "social:providers-changed":
           this._providersChanged();
           break;
         // Provider-specific notifications
         case "social:ambient-notification-changed":
           SocialStatus.updateButton(data);
           break;
         case "social:profile-changed":
           // make sure anything that happens here only affects the provider for
           // which the profile is changing, and that anything we call actually
           // needs to change based on profile data.
           SocialStatus.updateButton(data);
           break;
         case "social:frameworker-error":
           if (this.enabled && SocialSidebar.provider && SocialSidebar.provider.origin == data) {
             SocialSidebar.setSidebarErrorMessage();
           }
           break;
         case "nsPref:changed":
           if (data == "social.toast-notifications.enabled") {
             SocialSidebar.updateToggleNotifications();
           }
           break;
       }
     } catch (e) {
       Components.utils.reportError(e + "\n" + e.stack);
       throw e;
     }
   },
   _providersChanged: function() {
     SocialSidebar.clearProviderMenus();
     SocialSidebar.update();
     SocialChatBar.update();
     SocialShare.populateProviderMenu();
     SocialStatus.populateToolbarPalette();
     SocialMarks.populateToolbarPalette();
     SocialShare.update();
   },
   // This handles "ActivateSocialFeature" events fired against content documents
   // in this window.
   _activationEventHandler: function SocialUI_activationHandler(e) {
     let targetDoc;
     let node;
     if (e.target instanceof HTMLDocument) {
       // version 0 support
       targetDoc = e.target;
       node = targetDoc.documentElement
     } else {
       targetDoc = e.target.ownerDocument;
       node = e.target;
     }
     if (!(targetDoc instanceof HTMLDocument))
       return;
     // Ignore events fired in background tabs or iframes
     if (targetDoc.defaultView != content)
       return;
     // If we are in PB mode, we silently do nothing (bug 829404 exists to
     // do something sensible here...)
     if (PrivateBrowsingUtils.isWindowPrivate(window))
       return;
     // If the last event was received < 1s ago, ignore this one
     let now = Date.now();
     if (now - Social.lastEventReceived < 1000)
       return;
     Social.lastEventReceived = now;
     // We only want to activate if it is as a result of user input.
     let dwu = window.QueryInterface(Ci.nsIInterfaceRequestor)
                     .getInterface(Ci.nsIDOMWindowUtils);
     if (!dwu.isHandlingUserInput) {
       Cu.reportError("attempt to activate provider without user input from " + targetDoc.nodePrincipal.origin);
       return;
     }
     let data = node.getAttribute("data-service");
     if (data) {
       try {
         data = JSON.parse(data);
       } catch(e) {
         Cu.reportError("Social Service manifest parse error: "+e);
         return;
       }
     }
     Social.installProvider(targetDoc, data, function(manifest) {
       Social.activateFromOrigin(manifest.origin, function(provider) {
         if (provider.sidebarURL) {
           SocialSidebar.show(provider.origin);
         }
         if (provider.postActivationURL) {
           openUILinkIn(provider.postActivationURL, "tab");
         }
       });
     });
   },
   showLearnMore: function() {
     let url = Services.urlFormatter.formatURLPref("app.support.baseURL") + "social-api";
     openUILinkIn(url, "tab");
   },
   closeSocialPanelForLinkTraversal: function (target, linkNode) {
     // No need to close the panel if this traversal was not retargeted
     if (target == "" || target == "_self")
       return;
     // Check to see whether this link traversal was in a social panel
     let win = linkNode.ownerDocument.defaultView;
     let container = win.QueryInterface(Ci.nsIInterfaceRequestor)
                                   .getInterface(Ci.nsIWebNavigation)
                                   .QueryInterface(Ci.nsIDocShell)
                                   .chromeEventHandler;
     let containerParent = container.parentNode;
     if (containerParent.classList.contains("social-panel") &&
         containerParent instanceof Ci.nsIDOMXULPopupElement) {
       // allow the link traversal to finish before closing the panel
       setTimeout(() => {
         containerParent.hidePopup();
       }, 0);
     }
   },
   get _chromeless() {
     // Is this a popup window that doesn't want chrome shown?
     let docElem = document.documentElement;
     // extrachrome is not restored during session restore, so we need
     // to check for the toolbar as well.
     let chromeless = docElem.getAttribute("chromehidden").contains("extrachrome") ||
                      docElem.getAttribute('chromehidden').contains("toolbar");
     // This property is "fixed" for a window, so avoid doing the check above
     // multiple times...
     delete this._chromeless;
     this._chromeless = chromeless;
     return chromeless;
   },
   get enabled() {
     // Returns whether social is enabled *for this window*.
     if (this._chromeless || PrivateBrowsingUtils.isWindowPrivate(window))
       return false;
     return Social.providers.length > 0;
   },
   // called on tab/urlbar/location changes and after customization. Update
   // anything that is tab specific.
   updateState: function() {
     if (!this.enabled)
       return;
     SocialMarks.update();
     SocialShare.update();
   }
 }
 SocialChatBar = {
   get chatbar() {
     return document.getElementById("pinnedchats");
   },
   // Whether the chatbar is available for this window.  Note that in full-screen
   // mode chats are available, but not shown.
   get isAvailable() {
     return SocialUI.enabled;
   },
   // Does this chatbar have any chats (whether minimized, collapsed or normal)
   get hasChats() {
     return !!this.chatbar.firstElementChild;
   },
   openChat: function(aProvider, aURL, aCallback, aMode) {
     this.update();
     if (!this.isAvailable)
       return false;
     this.chatbar.openChat(aProvider, aURL, aCallback, aMode);
     // We only want to focus the chat if it is as a result of user input.
     let dwu = window.QueryInterface(Ci.nsIInterfaceRequestor)
                     .getInterface(Ci.nsIDOMWindowUtils);
     if (dwu.isHandlingUserInput)
       this.chatbar.focus();
     return true;
   },
   update: function() {
     let command = document.getElementById("Social:FocusChat");
     if (!this.isAvailable) {
       this.chatbar.hidden = command.hidden = true;
     } else {
       this.chatbar.hidden = command.hidden = false;
     }
     command.setAttribute("disabled", command.hidden ? "true" : "false");
   },
   focus: function SocialChatBar_focus() {
     this.chatbar.focus();
   }
 }
 SocialFlyout = {
   get panel() {
     return document.getElementById("social-flyout-panel");
   },
   get iframe() {
     if (!this.panel.firstChild)
       this._createFrame();
     return this.panel.firstChild;
   },
   dispatchPanelEvent: function(name) {
     let doc = this.iframe.contentDocument;
     let evt = doc.createEvent("CustomEvent");
     evt.initCustomEvent(name, true, true, {});
     doc.documentElement.dispatchEvent(evt);
   },
   _createFrame: function() {
     let panel = this.panel;
     if (!SocialUI.enabled || panel.firstChild)
       return;
     // create and initialize the panel for this window
     let iframe = document.createElement("iframe");
     iframe.setAttribute("type", "content");
     iframe.setAttribute("class", "social-panel-frame");
     iframe.setAttribute("flex", "1");
     iframe.setAttribute("tooltip", "aHTMLTooltip");
     iframe.setAttribute("origin", SocialSidebar.provider.origin);
     panel.appendChild(iframe);
   },
   setFlyoutErrorMessage: function SF_setFlyoutErrorMessage() {
     this.iframe.removeAttribute("src");
     this.iframe.webNavigation.loadURI("about:socialerror?mode=compactInfo&origin=" +
                                  encodeURIComponent(this.iframe.getAttribute("origin")),
                                  null, null, null, null);
     sizeSocialPanelToContent(this.panel, this.iframe);
   },
   unload: function() {
     let panel = this.panel;
     panel.hidePopup();
     if (!panel.firstChild)
       return
     let iframe = panel.firstChild;
     if (iframe.socialErrorListener)
       iframe.socialErrorListener.remove();
     panel.removeChild(iframe);
   },
   onShown: function(aEvent) {
     let panel = this.panel;
     let iframe = this.iframe;
     this._dynamicResizer = new DynamicResizeWatcher();
     iframe.docShell.isActive = true;
     iframe.docShell.isAppTab = true;
     if (iframe.contentDocument.readyState == "complete") {
       this._dynamicResizer.start(panel, iframe);
       this.dispatchPanelEvent("socialFrameShow");
     } else {
       // first time load, wait for load and dispatch after load
       iframe.addEventListener("load", function panelBrowserOnload(e) {
         iframe.removeEventListener("load", panelBrowserOnload, true);
         setTimeout(function() {
           if (SocialFlyout._dynamicResizer) { // may go null if hidden quickly
             SocialFlyout._dynamicResizer.start(panel, iframe);
             SocialFlyout.dispatchPanelEvent("socialFrameShow");
           }
         }, 0);
       }, true);
     }
   },
   onHidden: function(aEvent) {
     this._dynamicResizer.stop();
     this._dynamicResizer = null;
     this.iframe.docShell.isActive = false;
     this.dispatchPanelEvent("socialFrameHide");
   },
   load: function(aURL, cb) {
     if (!SocialSidebar.provider)
       return;
     this.panel.hidden = false;
     let iframe = this.iframe;
     // same url with only ref difference does not cause a new load, so we
     // want to go right to the callback
     let src = iframe.contentDocument && iframe.contentDocument.documentURIObject;
     if (!src || !src.equalsExceptRef(Services.io.newURI(aURL, null, null))) {
       iframe.addEventListener("load", function documentLoaded() {
         iframe.removeEventListener("load", documentLoaded, true);
         cb();
       }, true);
       // Force a layout flush by calling .clientTop so
       // that the docShell of this frame is created
       iframe.clientTop;
       Social.setErrorListener(iframe, SocialFlyout.setFlyoutErrorMessage.bind(SocialFlyout))
       iframe.setAttribute("src", aURL);
     } else {
       // we still need to set the src to trigger the contents hashchange event
       // for ref changes
       iframe.setAttribute("src", aURL);
       cb();
     }
   },
   open: function(aURL, yOffset, aCallback) {
     // Hide any other social panels that may be open.
     document.getElementById("social-notification-panel").hidePopup();
     if (!SocialUI.enabled)
       return;
     let panel = this.panel;
     let iframe = this.iframe;
     this.load(aURL, function() {
       sizeSocialPanelToContent(panel, iframe);
       let anchor = document.getElementById("social-sidebar-browser");
       if (panel.state == "open") {
         panel.moveToAnchor(anchor, "start_before", 0, yOffset, false);
       } else {
         panel.openPopup(anchor, "start_before", 0, yOffset, false, false);
       }
       if (aCallback) {
         try {
           aCallback(iframe.contentWindow);
         } catch(e) {
           Cu.reportError(e);
         }
       }
     });
   }
 }
 SocialShare = {
   get panel() {
     return document.getElementById("social-share-panel");
   },
   get iframe() {
     // first element is our menu vbox.
     if (this.panel.childElementCount == 1)
       return null;
     else
       return this.panel.lastChild;
   },
   uninit: function () {
     if (this.iframe) {
       this.iframe.remove();
     }
   },
   _createFrame: function() {
     let panel = this.panel;
     if (!SocialUI.enabled || this.iframe)
       return;
     this.panel.hidden = false;
     // create and initialize the panel for this window
     let iframe = document.createElement("iframe");
     iframe.setAttribute("type", "content");
     iframe.setAttribute("class", "social-share-frame");
     iframe.setAttribute("context", "contentAreaContextMenu");
     iframe.setAttribute("tooltip", "aHTMLTooltip");
     iframe.setAttribute("flex", "1");
     panel.appendChild(iframe);
     this.populateProviderMenu();
   },
   getSelectedProvider: function() {
     let provider;
     let lastProviderOrigin = this.iframe && this.iframe.getAttribute("origin");
     if (lastProviderOrigin) {
       provider = Social._getProviderFromOrigin(lastProviderOrigin);
     }
     // if they have a provider selected in the sidebar use that for the initial
     // default in share
     if (!provider)
       provider = SocialSidebar.provider;
     // if our provider has no shareURL, select the first one that does
     if (!provider || !provider.shareURL) {
       let providers = [p for (p of Social.providers) if (p.shareURL)];
       provider = providers.length > 0  && providers[0];
     }
     return provider;
   },
   populateProviderMenu: function() {
     if (!this.iframe)
       return;
     let providers = [p for (p of Social.providers) if (p.shareURL)];
     let hbox = document.getElementById("social-share-provider-buttons");
     // selectable providers are inserted before the provider-menu seperator,
     // remove any menuitems in that area
     while (hbox.firstChild) {
       hbox.removeChild(hbox.firstChild);
     }
     // reset our share toolbar
     // only show a selection if there is more than one
     if (!SocialUI.enabled || providers.length < 2) {
       this.panel.firstChild.hidden = true;
       return;
     }
     let selectedProvider = this.getSelectedProvider();
     for (let provider of providers) {
       let button = document.createElement("toolbarbutton");
       button.setAttribute("class", "toolbarbutton share-provider-button");
       button.setAttribute("type", "radio");
       button.setAttribute("group", "share-providers");
       button.setAttribute("image", provider.iconURL);
       button.setAttribute("tooltiptext", provider.name);
       button.setAttribute("origin", provider.origin);
       button.setAttribute("oncommand", "SocialShare.sharePage(this.getAttribute('origin')); this.checked=true;");
       if (provider == selectedProvider) {
         this.defaultButton = button;
       }
       hbox.appendChild(button);
     }
     if (!this.defaultButton) {
       this.defaultButton = hbox.firstChild
     }
     this.defaultButton.setAttribute("checked", "true");
     this.panel.firstChild.hidden = false;
   },
   get shareButton() {
     return document.getElementById("social-share-button");
   },
   canSharePage: function(aURI) {
     // we do not enable sharing from private sessions
     if (PrivateBrowsingUtils.isWindowPrivate(window))
       return false;
     if (!aURI || !(aURI.schemeIs('http') || aURI.schemeIs('https')))
       return false;
     return true;
   },
   update: function() {
     let shareButton = this.shareButton;
     shareButton.hidden = !SocialUI.enabled ||
                          [p for (p of Social.providers) if (p.shareURL)].length == 0;
     shareButton.disabled = shareButton.hidden || !this.canSharePage(gBrowser.currentURI);
     // also update the relevent command's disabled state so the keyboard
     // shortcut only works when available.
     let cmd = document.getElementById("Social:SharePage");
     if (shareButton.disabled)
       cmd.setAttribute("disabled", "true");
     else
       cmd.removeAttribute("disabled");
   },
   onShowing: function() {
     this.shareButton.setAttribute("open", "true");
   },
   onHidden: function() {
     this.shareButton.removeAttribute("open");
     this.iframe.setAttribute("src", "data:text/plain;charset=utf8,");
     this.currentShare = null;
   },
   setErrorMessage: function() {
     let iframe = this.iframe;
     if (!iframe)
       return;
     iframe.removeAttribute("src");
     iframe.webNavigation.loadURI("about:socialerror?mode=compactInfo&origin=" +
                                  encodeURIComponent(iframe.getAttribute("origin")),
                                  null, null, null, null);
     sizeSocialPanelToContent(this.panel, iframe);
   },
   sharePage: function(providerOrigin, graphData) {
     // if providerOrigin is undefined, we use the last-used provider, or the
     // current/default provider.  The provider selection in the share panel
     // will call sharePage with an origin for us to switch to.
     this._createFrame();
     let iframe = this.iframe;
     let provider;
     if (providerOrigin)
       provider = Social._getProviderFromOrigin(providerOrigin);
     else
       provider = this.getSelectedProvider();
     if (!provider || !provider.shareURL)
       return;
     // graphData is an optional param that either defines the full set of data
     // to be shared, or partial data about the current page. It is set by a call
     // in mozSocial API, or via nsContentMenu calls. If it is present, it MUST
     // define at least url. If it is undefined, we're sharing the current url in
     // the browser tab.
     let sharedURI = graphData ? Services.io.newURI(graphData.url, null, null) :
                                 gBrowser.currentURI;
     if (!this.canSharePage(sharedURI))
       return;
     // the point of this action type is that we can use existing share
     // endpoints (e.g. oexchange) that do not support additional
     // socialapi functionality.  One tweak is that we shoot an event
     // containing the open graph data.
     let pageData = graphData ? graphData : this.currentShare;
     if (!pageData || sharedURI == gBrowser.currentURI) {
       pageData = OpenGraphBuilder.getData(gBrowser);
       if (graphData) {
         // overwrite data retreived from page with data given to us as a param
         for (let p in graphData) {
           pageData[p] = graphData[p];
         }
       }
     }
     this.currentShare = pageData;
     let shareEndpoint = OpenGraphBuilder.generateEndpointURL(provider.shareURL, pageData);
     this._dynamicResizer = new DynamicResizeWatcher();
     // if we've already loaded this provider/page share endpoint, we don't want
     // to add another load event listener.
     let reload = true;
     let endpointMatch = shareEndpoint == iframe.getAttribute("src");
     let docLoaded = iframe.contentDocument && iframe.contentDocument.readyState == "complete";
     if (endpointMatch && docLoaded) {
       reload = shareEndpoint != iframe.contentDocument.location.spec;
     }
     if (!reload) {
       this._dynamicResizer.start(this.panel, iframe);
       iframe.docShell.isActive = true;
       iframe.docShell.isAppTab = true;
       let evt = iframe.contentDocument.createEvent("CustomEvent");
       evt.initCustomEvent("OpenGraphData", true, true, JSON.stringify(pageData));
       iframe.contentDocument.documentElement.dispatchEvent(evt);
     } else {
       // first time load, wait for load and dispatch after load
       iframe.addEventListener("load", function panelBrowserOnload(e) {
         iframe.removeEventListener("load", panelBrowserOnload, true);
         iframe.docShell.isActive = true;
         iframe.docShell.isAppTab = true;
         setTimeout(function() {
           if (SocialShare._dynamicResizer) { // may go null if hidden quickly
             SocialShare._dynamicResizer.start(iframe.parentNode, iframe);
           }
         }, 0);
         let evt = iframe.contentDocument.createEvent("CustomEvent");
         evt.initCustomEvent("OpenGraphData", true, true, JSON.stringify(pageData));
         iframe.contentDocument.documentElement.dispatchEvent(evt);
       }, true);
     }
     // always ensure that origin belongs to the endpoint
     let uri = Services.io.newURI(shareEndpoint, null, null);
     iframe.setAttribute("origin", provider.origin);
     iframe.setAttribute("src", shareEndpoint);
     let navBar = document.getElementById("nav-bar");
     let anchor = document.getAnonymousElementByAttribute(this.shareButton, "class", "toolbarbutton-icon");
     this.panel.openPopup(anchor, "bottomcenter topright", 0, 0, false, false);
     Social.setErrorListener(iframe, this.setErrorMessage.bind(this));
   }
 };
 SocialSidebar = {
   // Whether the sidebar can be shown for this window.
   get canShow() {
     if (!SocialUI.enabled || document.mozFullScreen)
       return false;
     return Social.providers.some(p => p.sidebarURL);
   },
   // Whether the user has toggled the sidebar on (for windows where it can appear)
   get opened() {
     let broadcaster = document.getElementById("socialSidebarBroadcaster");
     return !broadcaster.hidden;
   },
   restoreWindowState: function() {
     // Window state is used to allow different sidebar providers in each window.
     // We also store the provider used in a pref as the default sidebar to
     // maintain that state for users who do not restore window state. The
     // existence of social.sidebar.provider means the sidebar is open with that
     // provider.
     this._initialized = true;
     if (!this.canShow)
       return;
     if (Services.prefs.prefHasUserValue("social.provider.current")) {
       // "upgrade" when the first window opens if we have old prefs.  We get the
       // values from prefs this one time, window state will be saved when this
       // window is closed.
       let origin = Services.prefs.getCharPref("social.provider.current");
       Services.prefs.clearUserPref("social.provider.current");
       // social.sidebar.open default was true, but we only opened if there was
       // a current provider
       let opened = origin && true;
       if (Services.prefs.prefHasUserValue("social.sidebar.open")) {
         opened = origin && Services.prefs.getBoolPref("social.sidebar.open");
         Services.prefs.clearUserPref("social.sidebar.open");
       }
       let data = {
         "hidden": !opened,
         "origin": origin
       };
       SessionStore.setWindowValue(window, "socialSidebar", JSON.stringify(data));
     }
     let data = SessionStore.getWindowValue(window, "socialSidebar");
     // if this window doesn't have it's own state, use the state from the opener
     if (!data && window.opener && !window.opener.closed) {
       try {
         data = SessionStore.getWindowValue(window.opener, "socialSidebar");
       } catch(e) {
         // Window is not tracked, which happens on osx if the window is opened
         // from the hidden window. That happens when you close the last window
         // without quiting firefox, then open a new window.
       }
     }
     if (data) {
       data = JSON.parse(data);
       document.getElementById("social-sidebar-browser").setAttribute("origin", data.origin);
       if (!data.hidden)
         this.show(data.origin);
     } else if (Services.prefs.prefHasUserValue("social.sidebar.provider")) {
       // no window state, use the global state if it is available
       this.show(Services.prefs.getCharPref("social.sidebar.provider"));
     }
   },
   saveWindowState: function() {
     let broadcaster = document.getElementById("socialSidebarBroadcaster");
     let sidebarOrigin = document.getElementById("social-sidebar-browser").getAttribute("origin");
     let data = {
       "hidden": broadcaster.hidden,
       "origin": sidebarOrigin
     };
     // Save a global state for users who do not restore state.
     if (broadcaster.hidden)
       Services.prefs.clearUserPref("social.sidebar.provider");
     else
       Services.prefs.setCharPref("social.sidebar.provider", sidebarOrigin);
     try {
       SessionStore.setWindowValue(window, "socialSidebar", JSON.stringify(data));
     } catch(e) {
       // window not tracked during uninit
     }
   },
   setSidebarVisibilityState: function(aEnabled) {
     let sbrowser = document.getElementById("social-sidebar-browser");
     // it's possible we'll be called twice with aEnabled=false so let's
     // just assume we may often be called with the same state.
     if (aEnabled == sbrowser.docShellIsActive)
       return;
     sbrowser.docShellIsActive = aEnabled;
     let evt = sbrowser.contentDocument.createEvent("CustomEvent");
     evt.initCustomEvent(aEnabled ? "socialFrameShow" : "socialFrameHide", true, true, {});
     sbrowser.contentDocument.documentElement.dispatchEvent(evt);
   },
   updateToggleNotifications: function() {
     let command = document.getElementById("Social:ToggleNotifications");
     command.setAttribute("checked", Services.prefs.getBoolPref("social.toast-notifications.enabled"));
     command.setAttribute("hidden", !SocialUI.enabled);
   },
   update: function SocialSidebar_update() {
     // ensure we never update before restoreWindowState
     if (!this._initialized)
       return;
     this.ensureProvider();
     this.updateToggleNotifications();
     this._updateHeader();
     clearTimeout(this._unloadTimeoutId);
     // Hide the toggle menu item if the sidebar cannot appear
     let command = document.getElementById("Social:ToggleSidebar");
     command.setAttribute("hidden", this.canShow ? "false" : "true");
     // Hide the sidebar if it cannot appear, or has been toggled off.
     // Also set the command "checked" state accordingly.
     let hideSidebar = !this.canShow || !this.opened;
     let broadcaster = document.getElementById("socialSidebarBroadcaster");
     broadcaster.hidden = hideSidebar;
     command.setAttribute("checked", !hideSidebar);
     let sbrowser = document.getElementById("social-sidebar-browser");
     if (hideSidebar) {
       sbrowser.removeEventListener("load", SocialSidebar._loadListener, true);
       this.setSidebarVisibilityState(false);
       // If we've been disabled, unload the sidebar content immediately;
       // if the sidebar was just toggled to invisible, wait a timeout
       // before unloading.
       if (!this.canShow) {
         this.unloadSidebar();
       } else {
         this._unloadTimeoutId = setTimeout(
           this.unloadSidebar,
           Services.prefs.getIntPref("social.sidebar.unload_timeout_ms")
         );
       }
     } else {
       sbrowser.setAttribute("origin", this.provider.origin);
       if (this.provider.errorState == "frameworker-error") {
         SocialSidebar.setSidebarErrorMessage();
         return;
       }
       // Make sure the right sidebar URL is loaded
       if (sbrowser.getAttribute("src") != this.provider.sidebarURL) {
         // we check readyState right after setting src, we need a new content
         // viewer to ensure we are checking against the correct document.
         sbrowser.docShell.createAboutBlankContentViewer(null);
         Social.setErrorListener(sbrowser, this.setSidebarErrorMessage.bind(this));
         // setting isAppTab causes clicks on untargeted links to open new tabs
         sbrowser.docShell.isAppTab = true;
         sbrowser.setAttribute("src", this.provider.sidebarURL);
         PopupNotifications.locationChange(sbrowser);
       }
       // if the document has not loaded, delay until it is
       if (sbrowser.contentDocument.readyState != "complete") {
         document.getElementById("social-sidebar-button").setAttribute("loading", "true");
         sbrowser.addEventListener("load", SocialSidebar._loadListener, true);
       } else {
         this.setSidebarVisibilityState(true);
       }
     }
     this._updateCheckedMenuItems(this.opened && this.provider ? this.provider.origin : null);
   },
   _loadListener: function SocialSidebar_loadListener() {
     let sbrowser = document.getElementById("social-sidebar-browser");
     sbrowser.removeEventListener("load", SocialSidebar._loadListener, true);
     document.getElementById("social-sidebar-button").removeAttribute("loading");
     SocialSidebar.setSidebarVisibilityState(true);
   },
   unloadSidebar: function SocialSidebar_unloadSidebar() {
     let sbrowser = document.getElementById("social-sidebar-browser");
     if (!sbrowser.hasAttribute("origin"))
       return;
     sbrowser.stop();
     sbrowser.removeAttribute("origin");
     sbrowser.setAttribute("src", "about:blank");
     // We need to explicitly create a new content viewer because the old one
     // doesn't get destroyed until about:blank has loaded (which does not happen
     // as long as the element is hidden).
     sbrowser.docShell.createAboutBlankContentViewer(null);
     SocialFlyout.unload();
   },
   _unloadTimeoutId: 0,
   setSidebarErrorMessage: function() {
     let sbrowser = document.getElementById("social-sidebar-browser");
     // a frameworker error "trumps" a sidebar error.
     let origin = sbrowser.getAttribute("origin");
     if (origin) {
       origin = "&origin=" + encodeURIComponent(origin);
     }
     if (this.provider.errorState == "frameworker-error") {
       sbrowser.setAttribute("src", "about:socialerror?mode=workerFailure" + origin);
     } else {
       let url = encodeURIComponent(this.provider.sidebarURL);
       sbrowser.loadURI("about:socialerror?mode=tryAgain&url=" + url + origin, null, null);
     }
   },
   _provider: null,
   ensureProvider: function() {
     if (this._provider)
       return;
     // origin for sidebar is persisted, so get the previously selected sidebar
     // first, otherwise fallback to the first provider in the list
     let sbrowser = document.getElementById("social-sidebar-browser");
     let origin = sbrowser.getAttribute("origin");
     let providers = [p for (p of Social.providers) if (p.sidebarURL)];
     let provider;
     if (origin)
       provider = Social._getProviderFromOrigin(origin);
     if (!provider && providers.length > 0)
       provider = providers[0];
     if (provider)
       this.provider = provider;
   },
   get provider() {
     return this._provider;
   },
   set provider(provider) {
     if (!provider || provider.sidebarURL) {
       this._provider = provider;
       this._updateHeader();
       this._updateCheckedMenuItems(provider && provider.origin);
       this.update();
     }
   },
   disableProvider: function(origin) {
     if (this._provider && this._provider.origin == origin) {
       this._provider = null;
       // force a selection of the next provider if there is one
       this.ensureProvider();
     }
   },
   _updateHeader: function() {
     let provider = this.provider;
     let image, title;
     if (provider) {
       image = "url(" + (provider.icon32URL || provider.iconURL) + ")";
       title = provider.name;
     }
     document.getElementById("social-sidebar-favico").style.listStyleImage = image;
     document.getElementById("social-sidebar-title").value = title;
   },
   _updateCheckedMenuItems: function(origin) {
     // update selected menuitems
     let menuitems = document.getElementsByClassName("social-provider-menuitem");
     for (let mi of menuitems) {
       if (origin && mi.getAttribute("origin") == origin) {
         mi.setAttribute("checked", "true");
         mi.setAttribute("oncommand", "SocialSidebar.hide();");
       } else if (mi.getAttribute("checked")) {
         mi.removeAttribute("checked");
         mi.setAttribute("oncommand", "SocialSidebar.show(this.getAttribute('origin'));");
       }
     }
   },
   show: function(origin) {
     // always show the sidebar, and set the provider
     let broadcaster = document.getElementById("socialSidebarBroadcaster");
     broadcaster.hidden = false;
     if (origin)
       this.provider = Social._getProviderFromOrigin(origin);
     else
       SocialSidebar.update();
     this.saveWindowState();
   },
   hide: function() {
     let broadcaster = document.getElementById("socialSidebarBroadcaster");
     broadcaster.hidden = true;
     this._updateCheckedMenuItems();
     this.clearProviderMenus();
     SocialSidebar.update();
     this.saveWindowState();
   },
   toggleSidebar: function SocialSidebar_toggle() {
     let broadcaster = document.getElementById("socialSidebarBroadcaster");
     if (broadcaster.hidden)
       this.show();
     else
       this.hide();
   },
   populateSidebarMenu: function(event) {
     // Providers are removed from the view->sidebar menu when there is a change
     // in providers, so we only have to populate onshowing if there are no
     // provider menus. We populate this menu so long as there are enabled
     // providers with sidebars.
     let popup = event.target;
     let providerMenuSeps = popup.getElementsByClassName("social-provider-menu");
     if (providerMenuSeps[0].previousSibling.nodeName == "menuseparator")
       SocialSidebar.populateProviderMenu(providerMenuSeps[0]);
   },
   clearProviderMenus: function() {
     // called when there is a change in the provider list we clear all menus,
     // they will be repopulated when the menu is shown
     let providerMenuSeps = document.getElementsByClassName("social-provider-menu");
     for (let providerMenuSep of providerMenuSeps) {
       while (providerMenuSep.previousSibling.nodeName == "menuitem") {
         let menu = providerMenuSep.parentNode;
         menu.removeChild(providerMenuSep.previousSibling);
       }
     }
   },
   populateProviderMenu: function(providerMenuSep) {
     let menu = providerMenuSep.parentNode;
     // selectable providers are inserted before the provider-menu seperator,
     // remove any menuitems in that area
     while (providerMenuSep.previousSibling.nodeName == "menuitem") {
       menu.removeChild(providerMenuSep.previousSibling);
     }
     // only show a selection in the sidebar header menu if there is more than one
     let providers = [p for (p of Social.providers) if (p.sidebarURL)];
     if (providers.length < 2 && menu.id != "viewSidebarMenu") {
       providerMenuSep.hidden = true;
       return;
     }
     let topSep = providerMenuSep.previousSibling;
     for (let provider of providers) {
       let menuitem = document.createElement("menuitem");
       menuitem.className = "menuitem-iconic social-provider-menuitem";
       menuitem.setAttribute("image", provider.iconURL);
       menuitem.setAttribute("label", provider.name);
       menuitem.setAttribute("origin", provider.origin);
       if (this.opened && provider == this.provider) {
         menuitem.setAttribute("checked", "true");
         menuitem.setAttribute("oncommand", "SocialSidebar.hide();");
       } else {
         menuitem.setAttribute("oncommand", "SocialSidebar.show(this.getAttribute('origin'));");
       }
       menu.insertBefore(menuitem, providerMenuSep);
     }
     topSep.hidden = topSep.nextSibling == providerMenuSep;
     providerMenuSep.hidden = !providerMenuSep.nextSibling;
   }
 }
 // this helper class is used by removable/customizable buttons to handle
 // widget creation/destruction
 // When a provider is installed we show all their UI so the user will see the
 // functionality of what they installed. The user can later customize the UI,
 // moving buttons around or off the toolbar.
 //
 // On startup, we create the button widgets of any enabled provider.
 // CustomizableUI handles placement and persistence of placement.
 function ToolbarHelper(type, createButtonFn, listener) {
   this._createButton = createButtonFn;
   this._type = type;
   if (listener) {
     CustomizableUI.addListener(listener);
     // remove this listener on window close
     window.addEventListener("unload", () => {
       CustomizableUI.removeListener(listener);
     });
   }
 }
 ToolbarHelper.prototype = {
   idFromOrigin: function(origin) {
     // this id needs to pass the checks in CustomizableUI, so remove characters
     // that wont pass.
     return this._type + "-" + Services.io.newURI(origin, null, null).hostPort.replace(/[\.:]/g,'-');
   },
   // should be called on disable of a provider
   removeProviderButton: function(origin) {
     CustomizableUI.destroyWidget(this.idFromOrigin(origin));
   },
   clearPalette: function() {
     [this.removeProviderButton(p.origin) for (p of Social.providers)];
   },
   // should be called on enable of a provider
   populatePalette: function() {
     if (!Social.enabled) {
       this.clearPalette();
       return;
     }
     // create any buttons that do not exist yet if they have been persisted
     // as a part of the UI (otherwise they belong in the palette).
     for (let provider of Social.providers) {
       let id = this.idFromOrigin(provider.origin);
       this._createButton(id, provider);
     }
   }
 }
 let SocialStatusWidgetListener = {
   _getNodeOrigin: function(aWidgetId) {
     // we rely on the button id being the same as the widget.
     let node = document.getElementById(aWidgetId);
     if (!node)
       return null
     if (!node.classList.contains("social-status-button"))
       return null
     return node.getAttribute("origin");
   },
   onWidgetAdded: function(aWidgetId, aArea, aPosition) {
     let origin = this._getNodeOrigin(aWidgetId);
     if (origin)
       SocialStatus.updateButton(origin);
   },
   onWidgetRemoved: function(aWidgetId, aPrevArea) {
     let origin = this._getNodeOrigin(aWidgetId);
     if (!origin)
       return;
     // When a widget is demoted to the palette ('removed'), it's visual
     // style should change.
     SocialStatus.updateButton(origin);
     SocialStatus._removeFrame(origin);
   }
 }
 SocialStatus = {
   populateToolbarPalette: function() {
     this._toolbarHelper.populatePalette();
     for (let provider of Social.providers)
       this.updateButton(provider.origin);
   },
   removeProvider: function(origin) {
     this._removeFrame(origin);
     this._toolbarHelper.removeProviderButton(origin);
   },
   reloadProvider: function(origin) {
     let button = document.getElementById(this._toolbarHelper.idFromOrigin(origin));
     if (button && button.getAttribute("open") == "true")
       document.getElementById("social-notification-panel").hidePopup();
     this._removeFrame(origin);
   },
   _removeFrame: function(origin) {
     let notificationFrameId = "social-status-" + origin;
     let frame = document.getElementById(notificationFrameId);
     if (frame) {
       SharedFrame.forgetGroup(frame.id);
       frame.parentNode.removeChild(frame);
     }
   },
   get _toolbarHelper() {
     delete this._toolbarHelper;
     this._toolbarHelper = new ToolbarHelper("social-status-button",
                                             CreateSocialStatusWidget,
                                             SocialStatusWidgetListener);
     return this._toolbarHelper;
   },
   get _dynamicResizer() {
     delete this._dynamicResizer;
     this._dynamicResizer = new DynamicResizeWatcher();
     return this._dynamicResizer;
   },
   // status panels are one-per button per-process, we swap the docshells between
   // windows when necessary
   _attachNotificatonPanel: function(aParent, aButton, provider) {
     aParent.hidden = !SocialUI.enabled;
     let notificationFrameId = "social-status-" + provider.origin;
     let frame = document.getElementById(notificationFrameId);
     // If the button was customized to a new location, we we'll destroy the
     // iframe and start fresh.
     if (frame && frame.parentNode != aParent) {
       SharedFrame.forgetGroup(frame.id);
       frame.parentNode.removeChild(frame);
       frame = null;
     }
     if (!frame) {
       frame = SharedFrame.createFrame(
         notificationFrameId, /* frame name */
         aParent, /* parent */
         {
           "type": "content",
           "mozbrowser": "true",
           "class": "social-panel-frame",
           "id": notificationFrameId,
           "tooltip": "aHTMLTooltip",
           "context": "contentAreaContextMenu",
           "flex": "1",
           // work around bug 793057 - by making the panel roughly the final size
           // we are more likely to have the anchor in the correct position.
           "style": "width: " + PANEL_MIN_WIDTH + "px;",
           "origin": provider.origin,
           "src": provider.statusURL
         }
       );
       if (frame.socialErrorListener)
         frame.socialErrorListener.remove();
       if (frame.docShell) {
         frame.docShell.isActive = false;
         Social.setErrorListener(frame, this.setPanelErrorMessage.bind(this));
       }
     } else {
       frame.setAttribute("origin", provider.origin);
       SharedFrame.updateURL(notificationFrameId, provider.statusURL);
     }
     aButton.setAttribute("notificationFrameId", notificationFrameId);
   },
   updateButton: function(origin) {
     let id = this._toolbarHelper.idFromOrigin(origin);
     let widget = CustomizableUI.getWidget(id);
     if (!widget)
       return;
     let button = widget.forWindow(window).node;
     if (button) {
       // we only grab the first notification, ignore all others
       let place = CustomizableUI.getPlaceForItem(button);
       let provider = Social._getProviderFromOrigin(origin);
       let icons = provider.ambientNotificationIcons;
       let iconNames = Object.keys(icons);
       let notif = icons[iconNames[0]];
       // The image and tooltip need to be updated for both
       // ambient notification and profile changes.
       let iconURL = provider.icon32URL || provider.iconURL;
       let tooltiptext;
       if (!notif || place == "palette") {
         button.style.listStyleImage = "url(" + iconURL + ")";
         button.setAttribute("badge", "");
         button.setAttribute("aria-label", "");
         button.setAttribute("tooltiptext", provider.name);
         return;
       }
       button.style.listStyleImage = "url(" + (notif.iconURL || iconURL) + ")";
       button.setAttribute("tooltiptext", notif.label || provider.name);
       let badge = notif.counter || "";
       button.setAttribute("badge", badge);
       let ariaLabel = notif.label;
       // if there is a badge value, we must use a localizable string to insert it.
       if (badge)
         ariaLabel = gNavigatorBundle.getFormattedString("social.aria.toolbarButtonBadgeText",
                                                         [ariaLabel, badge]);
       button.setAttribute("aria-label", ariaLabel);
     }
   },
   showPopup: function(aToolbarButton) {
     // attach our notification panel if necessary
     let origin = aToolbarButton.getAttribute("origin");
     let provider = Social._getProviderFromOrigin(origin);
     // if we're a slice in the hamburger, use that panel instead
     let widgetGroup = CustomizableUI.getWidget(aToolbarButton.getAttribute("id"));
     let widget = widgetGroup.forWindow(window);
     let panel, showingEvent, hidingEvent;
     let inMenuPanel = widgetGroup.areaType == CustomizableUI.TYPE_MENU_PANEL;
     if (inMenuPanel) {
       panel = document.getElementById("PanelUI-socialapi");
       this._attachNotificatonPanel(panel, aToolbarButton, provider);
       widget.node.setAttribute("closemenu", "none");
       showingEvent = "ViewShowing";
       hidingEvent = "ViewHiding";
     } else {
       panel = document.getElementById("social-notification-panel");
       this._attachNotificatonPanel(panel, aToolbarButton, provider);
       showingEvent = "popupshown";
       hidingEvent = "popuphidden";
     }
     let notificationFrameId = aToolbarButton.getAttribute("notificationFrameId");
     let notificationFrame = document.getElementById(notificationFrameId);
     let wasAlive = SharedFrame.isGroupAlive(notificationFrameId);
     SharedFrame.setOwner(notificationFrameId, notificationFrame);
     // Clear dimensions on all browsers so the panel size will
     // only use the selected browser.
     let frameIter = panel.firstElementChild;
     while (frameIter) {
       frameIter.collapsed = (frameIter != notificationFrame);
       frameIter = frameIter.nextElementSibling;
     }
     function dispatchPanelEvent(name) {
       let evt = notificationFrame.contentDocument.createEvent("CustomEvent");
       evt.initCustomEvent(name, true, true, {});
       notificationFrame.contentDocument.documentElement.dispatchEvent(evt);
     }
     // we only use a dynamic resizer when we're located the toolbar.
     let dynamicResizer = inMenuPanel ? null : this._dynamicResizer;
     panel.addEventListener(hidingEvent, function onpopuphiding() {
       panel.removeEventListener(hidingEvent, onpopuphiding);
       aToolbarButton.removeAttribute("open");
       if (dynamicResizer)
         dynamicResizer.stop();
       notificationFrame.docShell.isActive = false;
       dispatchPanelEvent("socialFrameHide");
     });
     panel.addEventListener(showingEvent, function onpopupshown() {
       panel.removeEventListener(showingEvent, onpopupshown);
       // This attribute is needed on both the button and the
       // containing toolbaritem since the buttons on OS X have
       // moz-appearance:none, while their container gets
       // moz-appearance:toolbarbutton due to the way that toolbar buttons
       // get combined on OS X.
       let initFrameShow = () => {
         notificationFrame.docShell.isActive = true;
         notificationFrame.docShell.isAppTab = true;
         if (dynamicResizer)
           dynamicResizer.start(panel, notificationFrame);
         dispatchPanelEvent("socialFrameShow");
       };
       if (!inMenuPanel)
         aToolbarButton.setAttribute("open", "true");
       if (notificationFrame.contentDocument &&
           notificationFrame.contentDocument.readyState == "complete" && wasAlive) {
         initFrameShow();
       } else {
         // first time load, wait for load and dispatch after load
         notificationFrame.addEventListener("load", function panelBrowserOnload(e) {
           notificationFrame.removeEventListener("load", panelBrowserOnload, true);
           initFrameShow();
         }, true);
       }
     });
     if (inMenuPanel) {
       PanelUI.showSubView("PanelUI-socialapi", widget.node,
                           CustomizableUI.AREA_PANEL);
     } else {
       let anchor = document.getAnonymousElementByAttribute(aToolbarButton, "class", "toolbarbutton-badge-container");
       // Bug 849216 - open the popup in a setTimeout so we avoid the auto-rollup
       // handling from preventing it being opened in some cases.
       setTimeout(function() {
         panel.openPopup(anchor, "bottomcenter topright", 0, 0, false, false);
       }, 0);
     }
   },
   setPanelErrorMessage: function(aNotificationFrame) {
     if (!aNotificationFrame)
       return;
     let src = aNotificationFrame.getAttribute("src");
     aNotificationFrame.removeAttribute("src");
     let origin = aNotificationFrame.getAttribute("origin");
     aNotificationFrame.webNavigation.loadURI("about:socialerror?mode=tryAgainOnly&url=" +
                                             encodeURIComponent(src) + "&origin=" +
                                             encodeURIComponent(origin),
                                             null, null, null, null);
     let panel = aNotificationFrame.parentNode;
     sizeSocialPanelToContent(panel, aNotificationFrame);
   },
 };
 /**
  * SocialMarks
  *
  * Handles updates to toolbox and signals all buttons to update when necessary.
  */
 SocialMarks = {
   update: function() {
     // signal each button to update itself
     let currentButtons = document.querySelectorAll('toolbarbutton[type="socialmark"]');
     for (let elt of currentButtons)
       elt.update();
   },
   updatePanelButtons: function() {
     // querySelectorAll does not work on the menu panel the panel, so we have to
     // do this the hard way.
     let providers = SocialMarks.getProviders();
     let panel =  document.getElementById("PanelUI-popup");
     for (let p of providers) {
       let widgetId = SocialMarks._toolbarHelper.idFromOrigin(p.origin);
       let widget = CustomizableUI.getWidget(widgetId);
       if (!widget)
         continue;
       let node = widget.forWindow(window).node;
       if (node)
         node.update();
     }
   },
   getProviders: function() {
     // only rely on providers that the user has placed in the UI somewhere. This
     // also means that populateToolbarPalette must be called prior to using this
     // method, otherwise you get a big fat zero. For our use case with context
     // menu's, this is ok.
     let tbh = this._toolbarHelper;
     return [p for (p of Social.providers) if (p.markURL &&
                                               document.getElementById(tbh.idFromOrigin(p.origin)))];
   },
   populateContextMenu: function() {
     // only show a selection if enabled and there is more than one
     let providers = this.getProviders();
     // remove all previous entries by class
     let menus = [m for (m of document.getElementsByClassName("context-socialmarks"))];
     [m.parentNode.removeChild(m) for (m of menus)];
     let contextMenus = [
       {
         type: "link",
         id: "context-marklinkMenu",
         label: "social.marklinkMenu.label"
       },
       {
         type: "page",
         id: "context-markpageMenu",
         label: "social.markpageMenu.label"
       }
     ];
     for (let cfg of contextMenus) {
       this._populateContextPopup(cfg, providers);
     }
     this.updatePanelButtons();
   },
   MENU_LIMIT: 3, // adjustable for testing
   _populateContextPopup: function(menuInfo, providers) {
     let menu = document.getElementById(menuInfo.id);
     let popup = menu.firstChild;
     for (let provider of providers) {
       // We show up to MENU_LIMIT providers as single menuitems's at the top
       // level of the context menu, if we have more than that, dump them *all*
       // into the menu popup.
       let mi = document.createElement("menuitem");
       mi.setAttribute("oncommand", "gContextMenu.markLink(this.getAttribute('origin'));");
       mi.setAttribute("origin", provider.origin);
       mi.setAttribute("image", provider.iconURL);
       if (providers.length <= this.MENU_LIMIT) {
         // an extra class to make enable/disable easy
         mi.setAttribute("class", "menuitem-iconic context-socialmarks context-mark"+menuInfo.type);
         let menuLabel = gNavigatorBundle.getFormattedString(menuInfo.label, [provider.name]);
         mi.setAttribute("label", menuLabel);
         menu.parentNode.insertBefore(mi, menu);
       } else {
         mi.setAttribute("class", "menuitem-iconic context-socialmarks");
         mi.setAttribute("label", provider.name);
         popup.appendChild(mi);
       }
     }
   },
   populateToolbarPalette: function() {
     this._toolbarHelper.populatePalette();
     this.populateContextMenu();
   },
   removeProvider: function(origin) {
     this._toolbarHelper.removeProviderButton(origin);
   },
   get _toolbarHelper() {
     delete this._toolbarHelper;
     this._toolbarHelper = new ToolbarHelper("social-mark-button", CreateSocialMarkWidget);
     return this._toolbarHelper;
   },
   markLink: function(aOrigin, aUrl) {
     // find the button for this provider, and open it
     let id = this._toolbarHelper.idFromOrigin(aOrigin);
     document.getElementById(id).markLink(aUrl);
   }
 };
 })();