diff --git a/extension/chrome/content/browser.js b/extension/chrome/content/browser.js
index c439c57..9cc4fd5 100644
--- a/extension/chrome/content/browser.js
+++ b/extension/chrome/content/browser.js
@@ -18,6 +18,14 @@ get tabTitle() {
   return tabbrowser.mCurrentBrowser.contentTitle;
 },
 
+get tabGroupTitle() {
+  try 
+  {
+    return nightlyApp.getTabGroupTitle(window);
+  } 
+  catch (e) { }
+},
+
 init: function()
 {
   var brandbundle = document.getElementById("bundle_brand");
@@ -33,6 +41,11 @@ init: function()
 
   tabbrowser.updateTitlebar = nightly.updateTitlebar;
   tabbrowser.addEventListener("DOMTitleChanged", nightly.updateTitlebar, false);
+
+  try { // import tabGroupTitle functionality for titlebar customization
+    Components.utils.import("resource://nightly/tabGroupTitle.jsm", nightlyApp);
+  }
+  catch(e) { Components.utils.reportError(e); }
 },
 
 openURL: function(url)
diff --git a/extension/chrome/content/nightly.js b/extension/chrome/content/nightly.js
index d9d37d4..8d96c74 100644
--- a/extension/chrome/content/nightly.js
+++ b/extension/chrome/content/nightly.js
@@ -37,6 +37,7 @@ variables: {
   get compiler() this.appInfo.XPCOMABI.split("-")[1],
   get defaulttitle() { return nightlyApp.defaultTitle; },
   get tabtitle() { return nightlyApp.tabTitle; },
+  get tabgroup() { return nightlyApp.tabGroupTitle; },
   profile: null,
   toolkit: "cairo",
   flags: ""
diff --git a/extension/chrome/content/titlebar/customize.js b/extension/chrome/content/titlebar/customize.js
index 7310eb5..b2bd2dc 100644
--- a/extension/chrome/content/titlebar/customize.js
+++ b/extension/chrome/content/titlebar/customize.js
@@ -85,6 +85,7 @@ init: function(aEvent)
   
   paneTitle.addVariable("DefaultTitle");
   paneTitle.addVariable("TabTitle");
+  paneTitle.addVariable("TabGroup");
   paneTitle.addVariable("AppID");
   paneTitle.addVariable("Vendor");
   paneTitle.addVariable("Name");
diff --git a/extension/chrome/locale/en-US/variables.properties b/extension/chrome/locale/en-US/variables.properties
index e5f22b2..9993303 100644
--- a/extension/chrome/locale/en-US/variables.properties
+++ b/extension/chrome/locale/en-US/variables.properties
@@ -20,5 +20,6 @@ variable.Processor.description=Compilation Processor
 variable.Compiler.description=Compiler
 variable.DefaultTitle.description=Default Application Title
 variable.TabTitle.description=Current Tab's Title
+variable.TabGroup.description=Current Tab Group
 variable.Profile.description=Current Profile
 variable.Toolkit.description=Graphics Toolkit
diff --git a/extension/modules/tabGroupTitle.jsm b/extension/modules/tabGroupTitle.jsm
new file mode 100644
index 0000000..c0fbb30
--- /dev/null
+++ b/extension/modules/tabGroupTitle.jsm
@@ -0,0 +1,75 @@
+var EXPORTED_SYMBOLS = ["getTabGroupTitle"];
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+
+const GROUP_DATA_IDENTIFIER = "tabview-group";
+
+let sstore = Cc["@mozilla.org/browser/sessionstore;1"].getService(Ci.nsISessionStore);
+
+
+/**
+ * Simply retrieves the active tabgroup's title from SessionStore
+ */
+function getActiveGroupName(win) {
+  let data = "", groupTitle = "";
+  try {
+    data = sstore.getWindowValue(win, win.TabView.GROUPS_IDENTIFIER);
+    if (data) {
+      let parsedData = {};
+      parsedData = JSON.parse(data);
+      let activeGroupId = parsedData.activeGroupId;
+      data = sstore.getWindowValue(win, GROUP_DATA_IDENTIFIER);
+      parsedData = JSON.parse(data);
+      groupTitle = parsedData[activeGroupId].title;
+    }
+  } catch (e) { }
+  
+  return groupTitle;
+}
+
+/**
+ * Calculates Tab Group's title for nightlyApp
+ * @param {nsIDOMWindow} win A window which contains nightly.
+ *
+ * In Gecko 1.x title is set to "Undefined" as in other Apps
+ * Before FF10 title is managed by TabView
+ * After that we manages the title: using SessionStore and other borrowed code to generate
+ */
+function getTabGroupTitle(win) {
+  let nightlyApp = win.nightlyApp;
+  let TabView = win.TabView;
+  
+  // TabView isn't implemented
+  if (!("TabView" in win))
+    return;
+
+  // If we are before Bug 682996, 
+  // use TabView's own implementation except it is null
+  if (typeof(TabView.getActiveGroupName) === "function")
+    return TabView.getActiveGroupName() || "";
+
+  // TabView isn't initialized
+  if (!TabView._window) {
+    return getActiveGroupName(win);
+  }
+
+  // We get the active group this way, instead of querying
+  // GroupItems.getActiveGroupItem() because the tabSelect event
+  // will not have happened by the time the browser tries to
+  // update the title.
+  let groupItem = null;
+  let activeTab = win.gBrowser.selectedTab;
+  let activeTabItem = activeTab._tabViewTabItem;
+
+  if (activeTab.pinned) {
+    // It's an app tab, so it won't have a .tabItem. However, its .parent
+    // will already be set as the active group. 
+    groupItem = TabView._window.GroupItems.getActiveGroupItem();
+  } else if (activeTabItem) {
+    groupItem = activeTabItem.parent;
+  }
+
+  // groupItem may still be null, if the active tab is an orphan.
+  return groupItem ? groupItem.getTitle() : "";
+}