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

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

browser/base/content/browser-plugins.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.

 # -*- Mode: javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 # 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/.
 var gPluginHandler = {
   PREF_NOTIFY_MISSING_FLASH: "plugins.notifyMissingFlash",
   PREF_HIDE_MISSING_PLUGINS_NOTIFICATION: "plugins.hideMissingPluginsNotification",
   PREF_SESSION_PERSIST_MINUTES: "plugin.sessionPermissionNow.intervalInMinutes",
   PREF_PERSISTENT_DAYS: "plugin.persistentPermissionAlways.intervalInDays",
   getPluginUI: function (plugin, anonid) {
     return plugin.ownerDocument.
            getAnonymousElementByAttribute(plugin, "anonid", anonid);
   },
 #ifdef MOZ_CRASHREPORTER
   get CrashSubmit() {
     delete this.CrashSubmit;
     Cu.import("resource://gre/modules/CrashSubmit.jsm", this);
     return this.CrashSubmit;
   },
 #endif
   _getPluginInfo: function (pluginElement) {
     let pluginHost = Cc["@mozilla.org/plugin/host;1"].getService(Ci.nsIPluginHost);
     pluginElement.QueryInterface(Ci.nsIObjectLoadingContent);
     let tagMimetype;
     let pluginName = gNavigatorBundle.getString("pluginInfo.unknownPlugin");
     let pluginTag = null;
     let permissionString = null;
     let fallbackType = null;
     let blocklistState = null;
     tagMimetype = pluginElement.actualType;
     if (tagMimetype == "") {
       tagMimetype = pluginElement.type;
     }
     if (gPluginHandler.isKnownPlugin(pluginElement)) {
       pluginTag = pluginHost.getPluginTagForType(pluginElement.actualType);
       pluginName = gPluginHandler.makeNicePluginName(pluginTag.name);
       permissionString = pluginHost.getPermissionStringForType(pluginElement.actualType);
       fallbackType = pluginElement.defaultFallbackType;
       blocklistState = pluginHost.getBlocklistStateForType(pluginElement.actualType);
       // Make state-softblocked == state-notblocked for our purposes,
       // they have the same UI. STATE_OUTDATED should not exist for plugin
       // items, but let's alias it anyway, just in case.
       if (blocklistState == Ci.nsIBlocklistService.STATE_SOFTBLOCKED ||
           blocklistState == Ci.nsIBlocklistService.STATE_OUTDATED) {
         blocklistState = Ci.nsIBlocklistService.STATE_NOT_BLOCKED;
       }
     }
     return { mimetype: tagMimetype,
              pluginName: pluginName,
              pluginTag: pluginTag,
              permissionString: permissionString,
              fallbackType: fallbackType,
              blocklistState: blocklistState,
            };
   },
   // Map the plugin's name to a filtered version more suitable for user UI.
   makeNicePluginName : function (aName) {
     if (aName == "Shockwave Flash")
       return "Adobe Flash";
     // Clean up the plugin name by stripping off parenthetical clauses,
     // trailing version numbers or "plugin".
     // EG, "Foo Bar (Linux) Plugin 1.23_02" --> "Foo Bar"
     // Do this by first stripping the numbers, etc. off the end, and then
     // removing "Plugin" (and then trimming to get rid of any whitespace).
     // (Otherwise, something like "Java(TM) Plug-in 1.7.0_07" gets mangled)
     let newName = aName.replace(/\(.*?\)/g, "").
                         replace(/[\s\d\.\-\_\(\)]+$/, "").
                         replace(/\bplug-?in\b/i, "").trim();
     return newName;
   },
   /**
    * Update the visibility of the plugin overlay.
    */
   setVisibility : function (plugin, overlay, shouldShow) {
     overlay.classList.toggle("visible", shouldShow);
   },
   /**
    * Check whether the plugin should be visible on the page. A plugin should
    * not be visible if the overlay is too big, or if any other page content
    * overlays it.
    *
    * This function will handle showing or hiding the overlay.
    * @returns true if the plugin is invisible.
    */
   shouldShowOverlay : function (plugin, overlay) {
     // If the overlay size is 0, we haven't done layout yet. Presume that
     // plugins are visible until we know otherwise.
     if (overlay.scrollWidth == 0) {
       return true;
     }
     // Is the <object>'s size too small to hold what we want to show?
     let pluginRect = plugin.getBoundingClientRect();
     // XXX bug 446693. The text-shadow on the submitted-report text at
     //     the bottom causes scrollHeight to be larger than it should be.
     let overflows = (overlay.scrollWidth > pluginRect.width) ||
                     (overlay.scrollHeight - 5 > pluginRect.height);
     if (overflows) {
       return false;
     }
     // Is the plugin covered up by other content so that it is not clickable?
     // Floating point can confuse .elementFromPoint, so inset just a bit
     let left = pluginRect.left + 2;
     let right = pluginRect.right - 2;
     let top = pluginRect.top + 2;
     let bottom = pluginRect.bottom - 2;
     let centerX = left + (right - left) / 2;
     let centerY = top + (bottom - top) / 2;
     let points = [[left, top],
                    [left, bottom],
                    [right, top],
                    [right, bottom],
                    [centerX, centerY]];
     if (right <= 0 || top <= 0) {
       return false;
     }
     let contentWindow = plugin.ownerDocument.defaultView;
     let cwu = contentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
                            .getInterface(Ci.nsIDOMWindowUtils);
     for (let [x, y] of points) {
       let el = cwu.elementFromPoint(x, y, true, true);
       if (el !== plugin) {
         return false;
       }
     }
     return true;
   },
   addLinkClickCallback: function (linkNode, callbackName /*callbackArgs...*/) {
     // XXX just doing (callback)(arg) was giving a same-origin error. bug?
     let self = this;
     let callbackArgs = Array.prototype.slice.call(arguments).slice(2);
     linkNode.addEventListener("click",
                               function(evt) {
                                 if (!evt.isTrusted)
                                   return;
                                 evt.preventDefault();
                                 if (callbackArgs.length == 0)
                                   callbackArgs = [ evt ];
                                 (self[callbackName]).apply(self, callbackArgs);
                               },
                               true);
     linkNode.addEventListener("keydown",
                               function(evt) {
                                 if (!evt.isTrusted)
                                   return;
                                 if (evt.keyCode == evt.DOM_VK_RETURN) {
                                   evt.preventDefault();
                                   if (callbackArgs.length == 0)
                                     callbackArgs = [ evt ];
                                   evt.preventDefault();
                                   (self[callbackName]).apply(self, callbackArgs);
                                 }
                               },
                               true);
   },
   // Helper to get the binding handler type from a plugin object
   _getBindingType : function(plugin) {
     if (!(plugin instanceof Ci.nsIObjectLoadingContent))
       return null;
     switch (plugin.pluginFallbackType) {
       case Ci.nsIObjectLoadingContent.PLUGIN_UNSUPPORTED:
         return "PluginNotFound";
       case Ci.nsIObjectLoadingContent.PLUGIN_DISABLED:
         return "PluginDisabled";
       case Ci.nsIObjectLoadingContent.PLUGIN_BLOCKLISTED:
         return "PluginBlocklisted";
       case Ci.nsIObjectLoadingContent.PLUGIN_OUTDATED:
         return "PluginOutdated";
       case Ci.nsIObjectLoadingContent.PLUGIN_CLICK_TO_PLAY:
         return "PluginClickToPlay";
       case Ci.nsIObjectLoadingContent.PLUGIN_VULNERABLE_UPDATABLE:
         return "PluginVulnerableUpdatable";
       case Ci.nsIObjectLoadingContent.PLUGIN_VULNERABLE_NO_UPDATE:
         return "PluginVulnerableNoUpdate";
       case Ci.nsIObjectLoadingContent.PLUGIN_PLAY_PREVIEW:
         return "PluginPlayPreview";
       default:
         // Not all states map to a handler
         return null;
     }
   },
   supportedPlugins: {
     "mimetypes": {
       "application/x-shockwave-flash": "flash",
       "application/futuresplash": "flash",
       "application/x-java-.*": "java",
       "application/x-director": "shockwave",
       "application/(sdp|x-(mpeg|rtsp|sdp))": "quicktime",
       "audio/(3gpp(2)?|AMR|aiff|basic|mid(i)?|mp4|mpeg|vnd\.qcelp|wav|x-(aiff|m4(a|b|p)|midi|mpeg|wav))": "quicktime",
       "image/(pict|png|tiff|x-(macpaint|pict|png|quicktime|sgi|targa|tiff))": "quicktime",
       "video/(3gpp(2)?|flc|mp4|mpeg|quicktime|sd-video|x-mpeg)": "quicktime",
       "application/x-unknown": "test",
     },
     "plugins": {
       "flash": {
         "displayName": "Flash",
         "installWINNT": true,
         "installDarwin": true,
         "installLinux": true,
       },
       "java": {
         "displayName": "Java",
         "installWINNT": true,
         "installDarwin": true,
         "installLinux": true,
       },
       "shockwave": {
         "displayName": "Shockwave",
         "installWINNT": true,
         "installDarwin": true,
       },
       "quicktime": {
         "displayName": "QuickTime",
         "installWINNT": true,
       },
       "test": {
         "displayName": "Test plugin",
         "installWINNT": true,
         "installLinux": true,
         "installDarwin": true,
       }
     }
   },
   nameForSupportedPlugin: function (aMimeType) {
     for (let type in this.supportedPlugins.mimetypes) {
       let re = new RegExp(type);
       if (re.test(aMimeType)) {
         return this.supportedPlugins.mimetypes[type];
       }
     }
     return null;
   },
   canInstallThisMimeType: function (aMimeType) {
     let os = Services.appinfo.OS;
     let pluginName = this.nameForSupportedPlugin(aMimeType);
     if (pluginName && "install" + os in this.supportedPlugins.plugins[pluginName]) {
       return true;
     }
     return false;
   },
   handleEvent : function(event) {
     let eventType = event.type;
     if (eventType == "PluginRemoved") {
       let doc = event.target;
       let browser = gBrowser.getBrowserForDocument(doc.defaultView.top.document);
       if (browser)
         this._setPluginNotificationIcon(browser);
       return;
     }
     let plugin = event.target;
     let doc = plugin.ownerDocument;
     if (!(plugin instanceof Ci.nsIObjectLoadingContent))
       return;
     if (eventType == "PluginBindingAttached") {
       // The plugin binding fires this event when it is created.
       // As an untrusted event, ensure that this object actually has a binding
       // and make sure we don't handle it twice
       let overlay = this.getPluginUI(plugin, "main");
       if (!overlay || overlay._bindingHandled) {
         return;
       }
       overlay._bindingHandled = true;
       // Lookup the handler for this binding
       eventType = this._getBindingType(plugin);
       if (!eventType) {
         // Not all bindings have handlers
         return;
       }
     }
     let shouldShowNotification = false;
     let browser = gBrowser.getBrowserForDocument(doc.defaultView.top.document);
     if (!browser)
       return;
     switch (eventType) {
       case "PluginCrashed":
         this.pluginInstanceCrashed(plugin, event);
         break;
       case "PluginNotFound":
         let installable = this.showInstallNotification(plugin, eventType);
         // For non-object plugin tags, register a click handler to install the
         // plugin. Object tags can, and often do, deal with that themselves,
         // so don't stomp on the page developers toes.
         if (installable && !(plugin instanceof HTMLObjectElement)) {
           let installStatus = this.getPluginUI(plugin, "installStatus");
           installStatus.setAttribute("installable", "true");
           let iconStatus = this.getPluginUI(plugin, "icon");
           iconStatus.setAttribute("installable", "true");
           let installLink = this.getPluginUI(plugin, "installPluginLink");
           this.addLinkClickCallback(installLink, "installSinglePlugin", plugin);
         }
         break;
       case "PluginBlocklisted":
       case "PluginOutdated":
         shouldShowNotification = true;
         break;
       case "PluginVulnerableUpdatable":
         let updateLink = this.getPluginUI(plugin, "checkForUpdatesLink");
         this.addLinkClickCallback(updateLink, "openPluginUpdatePage");
         /* FALLTHRU */
       case "PluginVulnerableNoUpdate":
       case "PluginClickToPlay":
         this._handleClickToPlayEvent(plugin);
         let overlay = this.getPluginUI(plugin, "main");
         let pluginName = this._getPluginInfo(plugin).pluginName;
         let messageString = gNavigatorBundle.getFormattedString("PluginClickToActivate", [pluginName]);
         let overlayText = this.getPluginUI(plugin, "clickToPlay");
         overlayText.textContent = messageString;
         if (eventType == "PluginVulnerableUpdatable" ||
             eventType == "PluginVulnerableNoUpdate") {
           let vulnerabilityString = gNavigatorBundle.getString(eventType);
           let vulnerabilityText = this.getPluginUI(plugin, "vulnerabilityStatus");
           vulnerabilityText.textContent = vulnerabilityString;
         }
         shouldShowNotification = true;
         break;
       case "PluginPlayPreview":
         this._handlePlayPreviewEvent(plugin);
         break;
       case "PluginDisabled":
         // Screw the disabled message. It messes with HTML5 fallback on YouTube
         let plugin_overlay = doc.getAnonymousElementByAttribute(plugin, "class", "mainBox");
         if (plugin_overlay != null)
           plugin_overlay.style.visibility = "hidden";
         break;
       case "PluginInstantiated":
         shouldShowNotification = true;
         break;
     }
     // Show the in-content UI if it's not too big. The crashed plugin handler already did this.
     if (eventType != "PluginCrashed") {
       let overlay = this.getPluginUI(plugin, "main");
       if (overlay != null) {
         this.setVisibility(plugin, overlay,
                            this.shouldShowOverlay(plugin, overlay));
         let resizeListener = (event) => {
           this.setVisibility(plugin, overlay,
             this.shouldShowOverlay(plugin, overlay));
           this._setPluginNotificationIcon(browser);
         };
         plugin.addEventListener("overflow", resizeListener);
         plugin.addEventListener("underflow", resizeListener);
       }
     }
     let closeIcon = this.getPluginUI(plugin, "closeIcon");
     if (closeIcon) {
       closeIcon.addEventListener("click", function(aEvent) {
         if (aEvent.button == 0 && aEvent.isTrusted)
           gPluginHandler.hideClickToPlayOverlay(plugin);
       }, true);
     }
     if (shouldShowNotification) {
       this._showClickToPlayNotification(browser, plugin, false);
     }
   },
   isKnownPlugin: function PH_isKnownPlugin(objLoadingContent) {
     return (objLoadingContent.getContentTypeForMIMEType(objLoadingContent.actualType) ==
             Ci.nsIObjectLoadingContent.TYPE_PLUGIN);
   },
   canActivatePlugin: function PH_canActivatePlugin(objLoadingContent) {
     // if this isn't a known plugin, we can't activate it
     // (this also guards pluginHost.getPermissionStringForType against
     // unexpected input)
     if (!gPluginHandler.isKnownPlugin(objLoadingContent))
       return false;
     let pluginHost = Cc["@mozilla.org/plugin/host;1"].getService(Ci.nsIPluginHost);
     let permissionString = pluginHost.getPermissionStringForType(objLoadingContent.actualType);
     let principal = objLoadingContent.ownerDocument.defaultView.top.document.nodePrincipal;
     let pluginPermission = Services.perms.testPermissionFromPrincipal(principal, permissionString);
     let isFallbackTypeValid =
       objLoadingContent.pluginFallbackType >= Ci.nsIObjectLoadingContent.PLUGIN_CLICK_TO_PLAY &&
       objLoadingContent.pluginFallbackType <= Ci.nsIObjectLoadingContent.PLUGIN_VULNERABLE_NO_UPDATE;
     if (objLoadingContent.pluginFallbackType == Ci.nsIObjectLoadingContent.PLUGIN_PLAY_PREVIEW) {
       // checking if play preview is subject to CTP rules
       let playPreviewInfo = pluginHost.getPlayPreviewInfo(objLoadingContent.actualType);
       isFallbackTypeValid = !playPreviewInfo.ignoreCTP;
     }
     return !objLoadingContent.activated &&
            pluginPermission != Ci.nsIPermissionManager.DENY_ACTION &&
            isFallbackTypeValid;
   },
   hideClickToPlayOverlay: function(aPlugin) {
     let overlay = this.getPluginUI(aPlugin, "main");
     if (overlay) {
       overlay.classList.remove("visible");
     }
   },
   stopPlayPreview: function PH_stopPlayPreview(aPlugin, aPlayPlugin) {
     let objLoadingContent = aPlugin.QueryInterface(Ci.nsIObjectLoadingContent);
     if (objLoadingContent.activated)
       return;
     if (aPlayPlugin)
       objLoadingContent.playPlugin();
     else
       objLoadingContent.cancelPlayPreview();
   },
   newPluginInstalled : function(event) {
     // browser elements are anonymous so we can't just use target.
     var browser = event.originalTarget;
     // clear the plugin list, now that at least one plugin has been installed
     browser.missingPlugins = null;
     var notificationBox = gBrowser.getNotificationBox(browser);
     var notification = notificationBox.getNotificationWithValue("missing-plugins");
     if (notification)
       notificationBox.removeNotification(notification);
     // reload the browser to make the new plugin show.
     browser.reload();
   },
   // Callback for user clicking on a missing (unsupported) plugin.
   installSinglePlugin: function (plugin) {
     var missingPlugins = new Map();
     var pluginInfo = this._getPluginInfo(plugin);
     missingPlugins.set(pluginInfo.mimetype, pluginInfo);
     openDialog("chrome://mozapps/content/plugins/pluginInstallerWizard.xul",
                "PFSWindow", "chrome,centerscreen,resizable=yes",
                {plugins: missingPlugins, browser: gBrowser.selectedBrowser});
   },
   // Callback for user clicking on a disabled plugin
   managePlugins: function (aEvent) {
     BrowserOpenAddonsMgr("addons://list/plugin");
   },
   // Callback for user clicking on the link in a click-to-play plugin
   // (where the plugin has an update)
   openPluginUpdatePage: function (aEvent) {
     openUILinkIn(Services.urlFormatter.formatURLPref("plugins.update.url"), "tab");
   },
 #ifdef MOZ_CRASHREPORTER
   submitReport: function submitReport(pluginDumpID, browserDumpID, plugin) {
     let keyVals = {};
     if (plugin) {
       let userComment = this.getPluginUI(plugin, "submitComment").value.trim();
       if (userComment)
         keyVals.PluginUserComment = userComment;
       if (this.getPluginUI(plugin, "submitURLOptIn").checked)
         keyVals.PluginContentURL = plugin.ownerDocument.URL;
     }
     this.CrashSubmit.submit(pluginDumpID, { extraExtraKeyVals: keyVals });
     if (browserDumpID)
       this.CrashSubmit.submit(browserDumpID);
   },
 #endif
   // Callback for user clicking a "reload page" link
   reloadPage: function (browser) {
     browser.reload();
   },
   // Callback for user clicking the help icon
   openHelpPage: function () {
     openHelpLink("plugin-crashed", false);
   },
   showInstallNotification: function (aPlugin) {
     let hideMissingPluginsNotification =
       Services.prefs.getBoolPref(this.PREF_HIDE_MISSING_PLUGINS_NOTIFICATION);
     if (hideMissingPluginsNotification) {
       return false;
     }
     let browser = gBrowser.getBrowserForDocument(aPlugin.ownerDocument
                                                         .defaultView.top.document);
     if (!browser.missingPlugins)
       browser.missingPlugins = new Map();
     let pluginInfo = this._getPluginInfo(aPlugin);
     browser.missingPlugins.set(pluginInfo.mimetype, pluginInfo);
     // only show notification for small subset of plugins
     let mimetype = pluginInfo.mimetype.split(";")[0];
     if (!this.canInstallThisMimeType(mimetype))
       return false;
     let pluginIdentifier = this.nameForSupportedPlugin(mimetype);
     if (!pluginIdentifier)
       return false;
     let displayName = this.supportedPlugins.plugins[pluginIdentifier].displayName;
     // don't show several notifications
     let notification = PopupNotifications.getNotification("plugins-not-found", browser);
     if (notification)
       return true;
     let messageString = gNavigatorBundle.getString("installPlugin.message");
     let mainAction = {
       label: gNavigatorBundle.getFormattedString("installPlugin.button.label",
                                                  [displayName]),
       accessKey: gNavigatorBundle.getString("installPlugin.button.accesskey"),
       callback: function () {
         openDialog("chrome://mozapps/content/plugins/pluginInstallerWizard.xul",
                    "PFSWindow", "chrome,centerscreen,resizable=yes",
                    {plugins: browser.missingPlugins, browser: browser});
       }
     };
     let secondaryActions = null;
     let options = { dismissed: true };
     let showForFlash = Services.prefs.getBoolPref(this.PREF_NOTIFY_MISSING_FLASH);
     if (pluginIdentifier == "flash" && showForFlash) {
       let prefNotifyMissingFlash = this.PREF_NOTIFY_MISSING_FLASH;
       secondaryActions = [{
         label: gNavigatorBundle.getString("installPlugin.ignoreButton.label"),
         accessKey: gNavigatorBundle.getString("installPlugin.ignoreButton.accesskey"),
         callback: function () {
           Services.prefs.setBoolPref(prefNotifyMissingFlash, false);
         }
       }];
       options.dismissed = false;
     }
     PopupNotifications.show(browser, "plugins-not-found",
                             messageString, "plugin-install-notification-icon",
                             mainAction, secondaryActions, options);
     return true;
   },
   // Event listener for click-to-play plugins.
   _handleClickToPlayEvent: function PH_handleClickToPlayEvent(aPlugin) {
     let doc = aPlugin.ownerDocument;
     let browser = gBrowser.getBrowserForDocument(doc.defaultView.top.document);
     let pluginHost = Cc["@mozilla.org/plugin/host;1"].getService(Ci.nsIPluginHost);
     let objLoadingContent = aPlugin.QueryInterface(Ci.nsIObjectLoadingContent);
     // guard against giving pluginHost.getPermissionStringForType a type
     // not associated with any known plugin
     if (!gPluginHandler.isKnownPlugin(objLoadingContent))
       return;
     let permissionString = pluginHost.getPermissionStringForType(objLoadingContent.actualType);
     let principal = doc.defaultView.top.document.nodePrincipal;
     let pluginPermission = Services.perms.testPermissionFromPrincipal(principal, permissionString);
     let overlay = this.getPluginUI(aPlugin, "main");
     if (pluginPermission == Ci.nsIPermissionManager.DENY_ACTION) {
       if (overlay) {
         overlay.classList.remove("visible");
       }
       return;
     }
     if (overlay) {
       overlay.addEventListener("click", gPluginHandler._overlayClickListener, true);
     }
   },
   _overlayClickListener: {
     handleEvent: function PH_handleOverlayClick(aEvent) {
       let plugin = document.getBindingParent(aEvent.target);
       let contentWindow = plugin.ownerDocument.defaultView.top;
       // gBrowser.getBrowserForDocument does not exist in the case where we
       // drag-and-dropped a tab from a window containing only that tab. In
       // that case, the window gets destroyed.
       let browser = gBrowser.getBrowserForDocument ?
                       gBrowser.getBrowserForDocument(contentWindow.document) :
                       null;
       // If browser is null here, we've been drag-and-dropped from another
       // window, and this is the wrong click handler.
       if (!browser) {
         aEvent.target.removeEventListener("click", gPluginHandler._overlayClickListener, true);
         return;
       }
       let objLoadingContent = plugin.QueryInterface(Ci.nsIObjectLoadingContent);
       // Have to check that the target is not the link to update the plugin
       if (!(aEvent.originalTarget instanceof HTMLAnchorElement) &&
           (aEvent.originalTarget.getAttribute('anonid') != 'closeIcon') &&
           aEvent.button == 0 && aEvent.isTrusted) {
         gPluginHandler._showClickToPlayNotification(browser, plugin, true);
         aEvent.stopPropagation();
         aEvent.preventDefault();
       }
     }
   },
   _handlePlayPreviewEvent: function PH_handlePlayPreviewEvent(aPlugin) {
     let doc = aPlugin.ownerDocument;
     let browser = gBrowser.getBrowserForDocument(doc.defaultView.top.document);
     let pluginHost = Cc["@mozilla.org/plugin/host;1"].getService(Ci.nsIPluginHost);
     let pluginInfo = this._getPluginInfo(aPlugin);
     let playPreviewInfo = pluginHost.getPlayPreviewInfo(pluginInfo.mimetype);
     let previewContent = this.getPluginUI(aPlugin, "previewPluginContent");
     let iframe = previewContent.getElementsByClassName("previewPluginContentFrame")[0];
     if (!iframe) {
       // lazy initialization of the iframe
       iframe = doc.createElementNS("http://www.w3.org/1999/xhtml", "iframe");
       iframe.className = "previewPluginContentFrame";
       previewContent.appendChild(iframe);
       // Force a style flush, so that we ensure our binding is attached.
       aPlugin.clientTop;
     }
     iframe.src = playPreviewInfo.redirectURL;
     // MozPlayPlugin event can be dispatched from the extension chrome
     // code to replace the preview content with the native plugin
     previewContent.addEventListener("MozPlayPlugin", function playPluginHandler(aEvent) {
       if (!aEvent.isTrusted)
         return;
       previewContent.removeEventListener("MozPlayPlugin", playPluginHandler, true);
       let playPlugin = !aEvent.detail;
       gPluginHandler.stopPlayPreview(aPlugin, playPlugin);
       // cleaning up: removes overlay iframe from the DOM
       let iframe = previewContent.getElementsByClassName("previewPluginContentFrame")[0];
       if (iframe)
         previewContent.removeChild(iframe);
     }, true);
     if (!playPreviewInfo.ignoreCTP) {
       gPluginHandler._showClickToPlayNotification(browser, aPlugin, false);
     }
   },
   reshowClickToPlayNotification: function PH_reshowClickToPlayNotification() {
     let browser = gBrowser.selectedBrowser;
     let contentWindow = browser.contentWindow;
     let cwu = contentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
                            .getInterface(Ci.nsIDOMWindowUtils);
     let plugins = cwu.plugins;
     for (let plugin of plugins) {
       let overlay = this.getPluginUI(plugin, "main");
       if (overlay)
         overlay.removeEventListener("click", gPluginHandler._overlayClickListener, true);
       let objLoadingContent = plugin.QueryInterface(Ci.nsIObjectLoadingContent);
       if (gPluginHandler.canActivatePlugin(objLoadingContent))
         gPluginHandler._handleClickToPlayEvent(plugin);
     }
     gPluginHandler._showClickToPlayNotification(browser, null, false);
   },
   _clickToPlayNotificationEventCallback: function PH_ctpEventCallback(event) {
     if (event == "showing") {
       Services.telemetry.getHistogramById("PLUGINS_NOTIFICATION_SHOWN")
         .add(!this.options.primaryPlugin);
       // Histograms always start at 0, even though our data starts at 1
       let histogramCount = this.options.pluginData.size - 1;
       if (histogramCount > 4) {
         histogramCount = 4;
       }
       Services.telemetry.getHistogramById("PLUGINS_NOTIFICATION_PLUGIN_COUNT")
         .add(histogramCount);
     }
     else if (event == "dismissed") {
       // Once the popup is dismissed, clicking the icon should show the full
       // list again
       this.options.primaryPlugin = null;
     }
   },
   // Match the behaviour of nsPermissionManager
   _getHostFromPrincipal: function PH_getHostFromPrincipal(principal) {
     if (!principal.URI || principal.URI.schemeIs("moz-nullprincipal")) {
       return "(null)";
     }
     try {
       if (principal.URI.host)
         return principal.URI.host;
     } catch (e) {}
     return principal.origin;
   },
   /**
    * Called from the plugin doorhanger to set the new permissions for a plugin
    * and activate plugins if necessary.
    * aNewState should be either "allownow" "allowalways" or "block"
    */
   _updatePluginPermission: function PH_setPermissionForPlugins(aNotification, aPluginInfo, aNewState) {
     let permission;
     let expireType;
     let expireTime;
     let histogram =
       Services.telemetry.getHistogramById("PLUGINS_NOTIFICATION_USER_ACTION");
     // Update the permission manager.
     // Also update the current state of pluginInfo.fallbackType so that
     // subsequent opening of the notification shows the current state.
     switch (aNewState) {
       case "allownow":
         permission = Ci.nsIPermissionManager.ALLOW_ACTION;
         expireType = Ci.nsIPermissionManager.EXPIRE_SESSION;
         expireTime = Date.now() + Services.prefs.getIntPref(this.PREF_SESSION_PERSIST_MINUTES) * 60 * 1000;
         histogram.add(0);
         aPluginInfo.fallbackType = Ci.nsIObjectLoadingContent.PLUGIN_ACTIVE;
         break;
       case "allowalways":
         permission = Ci.nsIPermissionManager.ALLOW_ACTION;
         expireType = Ci.nsIPermissionManager.EXPIRE_TIME;
         expireTime = Date.now() +
           Services.prefs.getIntPref(this.PREF_PERSISTENT_DAYS) * 24 * 60 * 60 * 1000;
         histogram.add(1);
         aPluginInfo.fallbackType = Ci.nsIObjectLoadingContent.PLUGIN_ACTIVE;
         break;
       case "block":
         permission = Ci.nsIPermissionManager.PROMPT_ACTION;
         expireType = Ci.nsIPermissionManager.EXPIRE_NEVER;
         expireTime = 0;
         histogram.add(2);
         switch (aPluginInfo.blocklistState) {
           case Ci.nsIBlocklistService.STATE_VULNERABLE_UPDATE_AVAILABLE:
             aPluginInfo.fallbackType = Ci.nsIObjectLoadingContent.PLUGIN_VULNERABLE_UPDATABLE;
             break;
           case Ci.nsIBlocklistService.STATE_VULNERABLE_NO_UPDATE:
             aPluginInfo.fallbackType = Ci.nsIObjectLoadingContent.PLUGIN_VULNERABLE_NO_UPDATE;
             break;
           default:
             aPluginInfo.fallbackType = Ci.nsIObjectLoadingContent.PLUGIN_CLICK_TO_PLAY;
         }
         break;
       // In case a plugin has already been allowed in another tab, the "continue allowing" button
       // shouldn't change any permissions but should run the plugin-enablement code below.
       case "continue":
         aPluginInfo.fallbackType = Ci.nsIObjectLoadingContent.PLUGIN_ACTIVE;
         break;
       default:
         Cu.reportError(Error("Unexpected plugin state: " + aNewState));
         return;
     }
     let browser = aNotification.browser;
     let contentWindow = browser.contentWindow;
     if (aNewState != "continue") {
       let principal = contentWindow.document.nodePrincipal;
       Services.perms.addFromPrincipal(principal, aPluginInfo.permissionString,
                                       permission, expireType, expireTime);
       aPluginInfo.pluginPermissionType = expireType;
     }
     // Manually activate the plugins that would have been automatically
     // activated.
     let cwu = contentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
                            .getInterface(Ci.nsIDOMWindowUtils);
     let plugins = cwu.plugins;
     let pluginHost = Cc["@mozilla.org/plugin/host;1"].getService(Ci.nsIPluginHost);
     let pluginFound = false;
     for (let plugin of plugins) {
       plugin.QueryInterface(Ci.nsIObjectLoadingContent);
       if (!gPluginHandler.isKnownPlugin(plugin)) {
         continue;
       }
       if (aPluginInfo.permissionString == pluginHost.getPermissionStringForType(plugin.actualType)) {
         pluginFound = true;
         if (aNewState == "block") {
           plugin.reload(true);
         } else {
           if (gPluginHandler.canActivatePlugin(plugin)) {
             let overlay = this.getPluginUI(plugin, "main");
             if (overlay) {
               overlay.removeEventListener("click", gPluginHandler._overlayClickListener, true);
             }
             plugin.playPlugin();
           }
         }
       }
     }
     // If there are no instances of the plugin on the page any more, what the
     // user probably needs is for us to allow and then refresh.
     if (aNewState != "block" && !pluginFound) {
       browser.reload();
     }
     this._setPluginNotificationIcon(browser);
   },
   _showClickToPlayNotification: function PH_showClickToPlayNotification(aBrowser, aPlugin, aShowNow) {
     let notification = PopupNotifications.getNotification("click-to-play-plugins", aBrowser);
     let plugins = [];
     // if aPlugin is null, that means the user has navigated back to a page with plugins, and we need
     // to collect all the plugins
     if (aPlugin === null) {
       let contentWindow = aBrowser.contentWindow;
       let contentDoc = aBrowser.contentDocument;
       let cwu = contentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
                              .getInterface(Ci.nsIDOMWindowUtils);
       // cwu.plugins may contain non-plugin <object>s, filter them out
       plugins = cwu.plugins.filter((plugin) =>
         plugin.getContentTypeForMIMEType(plugin.actualType) == Ci.nsIObjectLoadingContent.TYPE_PLUGIN);
       if (plugins.length == 0) {
         if (notification) {
           PopupNotifications.remove(notification);
         }
         return;
       }
     } else {
       plugins = [aPlugin];
     }
     // If this is a new notification, create a pluginData map, otherwise append
     let pluginData;
     if (notification) {
       pluginData = notification.options.pluginData;
     } else {
       pluginData = new Map();
     }
     let principal = aBrowser.contentDocument.nodePrincipal;
     let principalHost = this._getHostFromPrincipal(principal);
     for (var plugin of plugins) {
       let pluginInfo = this._getPluginInfo(plugin);
       if (pluginInfo.permissionString === null) {
         Cu.reportError("No permission string for active plugin.");
         continue;
       }
       if (pluginData.has(pluginInfo.permissionString)) {
         continue;
       }
       let permissionObj = Services.perms.
         getPermissionObject(principal, pluginInfo.permissionString, false);
       if (permissionObj) {
         pluginInfo.pluginPermissionHost = permissionObj.host;
         pluginInfo.pluginPermissionType = permissionObj.expireType;
       }
       else {
         pluginInfo.pluginPermissionHost = principalHost;
         pluginInfo.pluginPermissionType = undefined;
       }
       let url;
       // TODO: allow the blocklist to specify a better link, bug 873093
       if (pluginInfo.blocklistState == Ci.nsIBlocklistService.STATE_VULNERABLE_UPDATE_AVAILABLE) {
         url = Services.urlFormatter.formatURLPref("plugins.update.url");
       }
       else if (pluginInfo.blocklistState != Ci.nsIBlocklistService.STATE_NOT_BLOCKED) {
         url = Services.blocklist.getPluginBlocklistURL(pluginInfo.pluginTag);
       }
       else {
         url = Services.urlFormatter.formatURLPref("app.support.baseURL") + "clicktoplay";
       }
       pluginInfo.detailsLink = url;
       pluginData.set(pluginInfo.permissionString, pluginInfo);
     }
     let primaryPluginPermission = null;
     if (aShowNow) {
       primaryPluginPermission = this._getPluginInfo(aPlugin).permissionString;
     }
     if (notification) {
       // Don't modify the notification UI while it's on the screen, that would be
       // jumpy and might allow clickjacking.
       if (aShowNow) {
         notification.options.primaryPlugin = primaryPluginPermission;
         notification.reshow();
         setTimeout(() => { this._setPluginNotificationIcon(aBrowser); }, 0);
       }
       return;
     }
     let options = {
       dismissed: !aShowNow,
       eventCallback: this._clickToPlayNotificationEventCallback,
       primaryPlugin: primaryPluginPermission,
       pluginData: pluginData
     };
     PopupNotifications.show(aBrowser, "click-to-play-plugins",
                             "", "plugins-notification-icon",
                             null, null, options);
     setTimeout(() => { this._setPluginNotificationIcon(aBrowser); }, 0);
   },
   _setPluginNotificationIcon : function PH_setPluginNotificationIcon(aBrowser) {
     // Because this is called on a timeout, sanity-check before continuing
     if (!aBrowser.docShell || !aBrowser.contentWindow) {
       return;
     }
     let notification = PopupNotifications.getNotification("click-to-play-plugins", aBrowser);
     if (!notification)
       return;
     // Make a copy of the actions, removing active plugins and checking for
     // outdated plugins.
     let haveInsecure = false;
     let actions = new Map();
     for (let action of notification.options.pluginData.values()) {
       switch (action.fallbackType) {
         // haveInsecure will trigger the red flashing icon and the infobar
         // styling below
         case Ci.nsIObjectLoadingContent.PLUGIN_VULNERABLE_UPDATABLE:
         case Ci.nsIObjectLoadingContent.PLUGIN_VULNERABLE_NO_UPDATE:
           haveInsecure = true;
           // fall through
         case Ci.nsIObjectLoadingContent.PLUGIN_CLICK_TO_PLAY:
           actions.set(action.permissionString, action);
           continue;
       }
     }
     // check for hidden plugins
     let contentWindow = aBrowser.contentWindow;
     let contentDoc = aBrowser.contentDocument;
     let cwu = contentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
                            .getInterface(Ci.nsIDOMWindowUtils);
     for (let plugin of cwu.plugins) {
       let info = this._getPluginInfo(plugin);
       if (!actions.has(info.permissionString)) {
         continue;
       }
       let fallbackType = info.fallbackType;
       if (fallbackType == Ci.nsIObjectLoadingContent.PLUGIN_ACTIVE) {
         actions.delete(info.permissionString);
         if (actions.size == 0) {
           break;
         }
         continue;
       }
       if (fallbackType != Ci.nsIObjectLoadingContent.PLUGIN_CLICK_TO_PLAY &&
           fallbackType != Ci.nsIObjectLoadingContent.PLUGIN_VULNERABLE_UPDATABLE &&
           fallbackType != Ci.nsIObjectLoadingContent.PLUGIN_VULNERABLE_NO_UPDATE) {
         continue;
       }
       let overlay = this.getPluginUI(plugin, "main");
       if (!overlay) {
         continue;
       }
       let shouldShow = this.shouldShowOverlay(plugin, overlay);
       this.setVisibility(plugin, overlay, shouldShow);
       if (shouldShow) {
         actions.delete(info.permissionString);
         if (actions.size == 0) {
           break;
         }
       }
     }
     // Set up the icon
     document.getElementById("plugins-notification-icon").classList.
       toggle("plugin-blocked", haveInsecure);
     // Now configure the notification bar
     let notificationBox = gBrowser.getNotificationBox(aBrowser);
     function hideNotification() {
       let n = notificationBox.getNotificationWithValue("plugin-hidden");
       if (n) {
         notificationBox.removeNotification(n, true);
       }
     }
     // There are three different cases when showing an infobar:
     // 1.  A single type of plugin is hidden on the page. Show the UI for that
     //     plugin.
     // 2a. Multiple types of plugins are hidden on the page. Show the multi-UI
     //     with the vulnerable styling.
     // 2b. Multiple types of plugins are hidden on the page, but none are
     //     vulnerable. Show the nonvulnerable multi-UI.
     function showNotification() {
       let n = notificationBox.getNotificationWithValue("plugin-hidden");
       if (n) {
         // If something is already shown, just keep it
         return;
       }
       Services.telemetry.getHistogramById("PLUGINS_INFOBAR_SHOWN").
         add(true);
       let message;
       // Icons set directly cannot be manipulated using moz-image-region, so
       // we use CSS classes instead.
       let host = gPluginHandler._getHostFromPrincipal(aBrowser.contentDocument.nodePrincipal);
       let brand = document.getElementById("bundle_brand").getString("brandShortName");
       if (actions.size == 1) {
         let pluginInfo = [...actions.values()][0];
         let pluginName = pluginInfo.pluginName;
         switch (pluginInfo.fallbackType) {
           case Ci.nsIObjectLoadingContent.PLUGIN_CLICK_TO_PLAY:
             message = gNavigatorBundle.getFormattedString(
               "pluginActivateNew.message",
               [pluginName, host]);
             break;
           case Ci.nsIObjectLoadingContent.PLUGIN_VULNERABLE_UPDATABLE:
             message = gNavigatorBundle.getFormattedString(
               "pluginActivateOutdated.message",
               [pluginName, host, brand]);
             break;
           case Ci.nsIObjectLoadingContent.PLUGIN_VULNERABLE_NO_UPDATE:
             message = gNavigatorBundle.getFormattedString(
               "pluginActivateVulnerable.message",
               [pluginName, host, brand]);
         }
       } else {
         // Multi-plugin
         message = gNavigatorBundle.getFormattedString(
           "pluginActivateMultiple.message", [host]);
         for (let action of actions.values()) {
           if (action.fallbackType != Ci.nsIObjectLoadingContent.PLUGIN_CLICK_TO_PLAY) {
             break;
           }
         }
       }
       let buttons = [
         {
           label: gNavigatorBundle.getString("pluginContinueBlocking.label"),
           accessKey: gNavigatorBundle.getString("pluginContinueBlocking.accesskey"),
           callback: function() {
             Services.telemetry.getHistogramById("PLUGINS_INFOBAR_BLOCK").
               add(true);
             Services.perms.addFromPrincipal(aBrowser.contentDocument.nodePrincipal,
                                             "plugin-hidden-notification",
                                             Services.perms.DENY_ACTION);
           }
         },
         {
           label: gNavigatorBundle.getString("pluginActivateTrigger.label"),
           accessKey: gNavigatorBundle.getString("pluginActivateTrigger.accesskey"),
           callback: function() {
             Services.telemetry.getHistogramById("PLUGINS_INFOBAR_ALLOW").
               add(true);
             let curNotification =
               PopupNotifications.getNotification("click-to-play-plugins",
                                                  aBrowser);
             if (curNotification) {
               curNotification.reshow();
             }
           }
         }
       ];
       n = notificationBox.
         appendNotification(message, "plugin-hidden", null,
                            notificationBox.PRIORITY_INFO_HIGH, buttons);
       if (haveInsecure) {
         n.classList.add('pluginVulnerable');
       }
     }
     if (actions.size == 0) {
       hideNotification();
     } else {
       let notificationPermission = Services.perms.testPermissionFromPrincipal(
         aBrowser.contentDocument.nodePrincipal, "plugin-hidden-notification");
       if (notificationPermission == Ci.nsIPermissionManager.DENY_ACTION) {
         hideNotification();
       } else {
         showNotification();
       }
     }
   },
   // Crashed-plugin observer. Notified once per plugin crash, before events
   // are dispatched to individual plugin instances.
   pluginCrashed : function(subject, topic, data) {
     let propertyBag = subject;
     if (!(propertyBag instanceof Ci.nsIPropertyBag2) ||
         !(propertyBag instanceof Ci.nsIWritablePropertyBag2))
      return;
 #ifdef MOZ_CRASHREPORTER
     let pluginDumpID = propertyBag.getPropertyAsAString("pluginDumpID");
     let browserDumpID= propertyBag.getPropertyAsAString("browserDumpID");
     let shouldSubmit = gCrashReporter.submitReports;
     let doPrompt     = true; // XXX followup to get via gCrashReporter
     // Submit automatically when appropriate.
     if (pluginDumpID && shouldSubmit && !doPrompt) {
       this.submitReport(pluginDumpID, browserDumpID);
       // Submission is async, so we can't easily show failure UI.
       propertyBag.setPropertyAsBool("submittedCrashReport", true);
     }
 #endif
   },
   // Crashed-plugin event listener. Called for every instance of a
   // plugin in content.
   pluginInstanceCrashed: function (plugin, aEvent) {
     // Ensure the plugin and event are of the right type.
     if (!(aEvent instanceof Ci.nsIDOMCustomEvent))
       return;
     let propBag = aEvent.detail.QueryInterface(Ci.nsIPropertyBag2);
     let submittedReport = propBag.getPropertyAsBool("submittedCrashReport");
     let doPrompt        = true; // XXX followup for .getPropertyAsBool("doPrompt");
     let submitReports   = true; // XXX followup for .getPropertyAsBool("submitReports");
     let pluginName      = propBag.getPropertyAsAString("pluginName");
     let pluginDumpID    = propBag.getPropertyAsAString("pluginDumpID");
     let browserDumpID   = propBag.getPropertyAsAString("browserDumpID");
     // Remap the plugin name to a more user-presentable form.
     pluginName = this.makeNicePluginName(pluginName);
     let messageString = gNavigatorBundle.getFormattedString("crashedpluginsMessage.title", [pluginName]);
     //
     // Configure the crashed-plugin placeholder.
     //
     // Force a layout flush so the binding is attached.
     plugin.clientTop;
     let overlay = this.getPluginUI(plugin, "main");
     let statusDiv = this.getPluginUI(plugin, "submitStatus");
     let doc = plugin.ownerDocument;
 #ifdef MOZ_CRASHREPORTER
     let status;
     // Determine which message to show regarding crash reports.
     if (submittedReport) { // submitReports && !doPrompt, handled in observer
       status = "submitted";
     }
     else if (!submitReports && !doPrompt) {
       status = "noSubmit";
     }
     else { // doPrompt
       status = "please";
       this.getPluginUI(plugin, "submitButton").addEventListener("click",
         function (event) {
           if (event.button != 0 || !event.isTrusted)
             return;
           this.submitReport(pluginDumpID, browserDumpID, plugin);
           pref.setBoolPref("", optInCB.checked);
         }.bind(this));
       let optInCB = this.getPluginUI(plugin, "submitURLOptIn");
       let pref = Services.prefs.getBranch("dom.ipc.plugins.reportCrashURL");
       optInCB.checked = pref.getBoolPref("");
     }
     // If we don't have a minidumpID, we can't (or didn't) submit anything.
     // This can happen if the plugin is killed from the task manager.
     if (!pluginDumpID) {
         status = "noReport";
     }
     statusDiv.setAttribute("status", status);
     let helpIcon = this.getPluginUI(plugin, "helpIcon");
     this.addLinkClickCallback(helpIcon, "openHelpPage");
     // If we're showing the link to manually trigger report submission, we'll
     // want to be able to update all the instances of the UI for this crash to
     // show an updated message when a report is submitted.
     if (doPrompt) {
       let observer = {
         QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
                                                Ci.nsISupportsWeakReference]),
         observe : function(subject, topic, data) {
           let propertyBag = subject;
           if (!(propertyBag instanceof Ci.nsIPropertyBag2))
             return;
           // Ignore notifications for other crashes.
           if (propertyBag.get("minidumpID") != pluginDumpID)
             return;
           statusDiv.setAttribute("status", data);
         },
         handleEvent : function(event) {
             // Not expected to be called, just here for the closure.
         }
       }
       // Use a weak reference, so we don't have to remove it...
       Services.obs.addObserver(observer, "crash-report-status", true);
       // ...alas, now we need something to hold a strong reference to prevent
       // it from being GC. But I don't want to manually manage the reference's
       // lifetime (which should be no greater than the page).
       // Clever solution? Use a closue with an event listener on the document.
       // When the doc goes away, so do the listener references and the closure.
       doc.addEventListener("mozCleverClosureHack", observer, false);
     }
 #endif
     let crashText = this.getPluginUI(plugin, "crashedText");
     crashText.textContent = messageString;
     let browser = gBrowser.getBrowserForDocument(doc.defaultView.top.document);
     let link = this.getPluginUI(plugin, "reloadLink");
     this.addLinkClickCallback(link, "reloadPage", browser);
     let notificationBox = gBrowser.getNotificationBox(browser);
     let isShowing = this.shouldShowOverlay(plugin, overlay);
     // Is the <object>'s size too small to hold what we want to show?
     if (!isShowing) {
       // First try hiding the crash report submission UI.
       statusDiv.removeAttribute("status");
       isShowing = this.shouldShowOverlay(plugin, overlay);
     }
     this.setVisibility(plugin, overlay, isShowing);
     if (isShowing) {
       // If a previous plugin on the page was too small and resulted in adding a
       // notification bar, then remove it because this plugin instance it big
       // enough to serve as in-content notification.
       hideNotificationBar();
       doc.mozNoPluginCrashedNotification = true;
     } else {
       // If another plugin on the page was large enough to show our UI, we don't
       // want to show a notification bar.
       if (!doc.mozNoPluginCrashedNotification)
         showNotificationBar(pluginDumpID, browserDumpID);
     }
     function hideNotificationBar() {
       let notification = notificationBox.getNotificationWithValue("plugin-crashed");
       if (notification)
         notificationBox.removeNotification(notification, true);
     }
     function showNotificationBar(pluginDumpID, browserDumpID) {
       // If there's already an existing notification bar, don't do anything.
       let notification = notificationBox.getNotificationWithValue("plugin-crashed");
       if (notification)
         return;
       // Configure the notification bar
       let priority = notificationBox.PRIORITY_WARNING_MEDIUM;
       let iconURL = "chrome://mozapps/skin/plugins/notifyPluginCrashed.png";
       let reloadLabel = gNavigatorBundle.getString("crashedpluginsMessage.reloadButton.label");
       let reloadKey   = gNavigatorBundle.getString("crashedpluginsMessage.reloadButton.accesskey");
       let submitLabel = gNavigatorBundle.getString("crashedpluginsMessage.submitButton.label");
       let submitKey   = gNavigatorBundle.getString("crashedpluginsMessage.submitButton.accesskey");
       let buttons = [{
         label: reloadLabel,
         accessKey: reloadKey,
         popup: null,
         callback: function() { browser.reload(); },
       }];
 #ifdef MOZ_CRASHREPORTER
       let submitButton = {
         label: submitLabel,
         accessKey: submitKey,
         popup: null,
           callback: function() { gPluginHandler.submitReport(pluginDumpID, browserDumpID); },
       };
       if (pluginDumpID)
         buttons.push(submitButton);
 #endif
       let notification = notificationBox.appendNotification(messageString, "plugin-crashed",
                                                             iconURL, priority, buttons);
       // Add the "learn more" link.
       let XULNS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
       let link = notification.ownerDocument.createElementNS(XULNS, "label");
       link.className = "text-link";
       link.setAttribute("value", gNavigatorBundle.getString("crashedpluginsMessage.learnMore"));
       let crashurl = formatURL("app.support.baseURL", true);
       crashurl += "plugin-crashed-notificationbar";
       link.href = crashurl;
       let description = notification.ownerDocument.getAnonymousElementByAttribute(notification, "anonid", "messageText");
       description.appendChild(link);
       // Remove the notfication when the page is reloaded.
       doc.defaultView.top.addEventListener("unload", function() {
         notificationBox.removeNotification(notification);
       }, false);
     }
   }
 };