+ Addressing dolske's comments in bug 574217:

++ Using Cc and Ci
++ Using let
++ Changing getWindowTitle to a memoizing getter
++ Updated comment for key combo routine

browser/base/content/browser-tabview.js

@@ -40,6 +40,15 @@ let TabView = {
   _sessionstore: null,
   _visibilityID: "tabview-visibility",
   
+  // ----------
+  get windowTitle() {
+    delete this.windowTitle;
+    let brandBundle = document.getElementById("bundle_brand");
+    let brandShortName = brandBundle.getString("brandShortName");
+    let title = gNavigatorBundle.getFormattedString("tabView.title", [brandShortName]);
+    return this.windowTitle = title;
+  },
+
   // ----------
   init: function TabView_init() {    
     // ___ keys    
@@ -47,8 +56,8 @@ let TabView = {
 
     // ___ visibility
     this._sessionstore =
-      Components.classes["@mozilla.org/browser/sessionstore;1"]
-        .getService(Components.interfaces.nsISessionStore);
+      Cc["@mozilla.org/browser/sessionstore;1"].
+        getService(Ci.nsISessionStore);
 
     let data = this._sessionstore.getWindowValue(window, this._visibilityID);
     if (data) {
@@ -70,7 +79,7 @@ let TabView = {
       this._deck = document.getElementById("tab-view-deck");
       
       // ___ create the frame
-      var iframe = document.createElement("iframe");
+      let iframe = document.createElement("iframe");
       iframe.id = "tab-view";
       iframe.setAttribute("transparent", "true");
       iframe.flex = 1;
@@ -133,13 +142,6 @@ let TabView = {
       this.show();
   },
 
-  // ----------
-  getWindowTitle: function() {
-    let brandBundle = document.getElementById("bundle_brand");
-    let brandShortName = brandBundle.getString("brandShortName");
-    return gNavigatorBundle.getFormattedString("tabView.title", [brandShortName]);
-  },
-
   // ----------
   updateContextMenu: function(tab, popup) {
     let isEmpty = true;
@@ -183,16 +185,16 @@ let TabView = {
   },
 
   // ----------
-  // Overrides the browser's keys for navigating between tab (outside of the
-  // TabView UI) so they do the right thing in respect to groupItems.
+  // Adds new key commands to the browser, for invoking the Tab Candy UI
+  // and for switching between groups of tabs when outside of the Tab Candy UI.
   _setBrowserKeyHandlers : function() {
-    var self = this;
+    let self = this;
 
     window.addEventListener("keypress", function(event) {
       if (self.isVisible())
         return;
 
-      var charCode = event.charCode;
+      let charCode = event.charCode;
 #ifdef XP_MACOSX
       // if a text box in a webpage has the focus, the event.altKey would
       // return false so we are depending on the charCode here.
@@ -215,7 +217,7 @@ let TabView = {
         event.preventDefault();
 
         self._initFrame(function() {
-          var tabItem = self._window.GroupItems.getNextGroupItemTab(event.shiftKey);
+          let tabItem = self._window.GroupItems.getNextGroupItemTab(event.shiftKey);
           if (tabItem)
             window.gBrowser.selectedTab = tabItem.tab;
         });

browser/base/content/tabbrowser.xml

@@ -726,7 +726,7 @@
             if (TabView && TabView.isVisible()) {
               // ToDo: this will be removed when we gain ability to draw to the menu bar.
               // Bug 586175
-              this.ownerDocument.title = TabView.getWindowTitle();
+              this.ownerDocument.title = TabView.windowTitle;
             } else {
               this.ownerDocument.title = this.getWindowTitleForBrowser(this.mCurrentBrowser);
             }