diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug649006.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug649006.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,99 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+let contentWindow;
+let contentElement;
+let groupItem;
+
+function test() {
+  waitForExplicitFinish();
+
+  registerCleanupFunction(function () {
+    hideTabView();
+  });
+
+  showTabView(function() {
+    contentWindow = TabView.getContentWindow();
+    contentElement = contentWindow.document.getElementById("content");
+    test1();
+  });
+}
+
+function test1() {
+  is(gBrowser.tabs.length, 1, 
+     "Total number of tabs is 1 before right button double click");
+  // first click
+  mouseClick(contentElement, 2);
+  // second click
+  mouseClick(contentElement, 2);
+
+  is(gBrowser.tabs.length, 1, 
+     "Total number of tabs is 1 after right button double click");
+  test2();
+}
+
+
+function test2() {
+  is(gBrowser.tabs.length, 1, 
+     "Total number of tabs is 1 before left, right and left mouse clicks");
+
+  // first click
+  mouseClick(contentElement, 0);
+  // second click
+  mouseClick(contentElement, 2);
+  // third click
+  mouseClick(contentElement, 0);
+
+  is(gBrowser.tabs.length, 1, 
+     "Total number of tabs is 1 before left, right and left mouse clicks");
+  test3();
+}
+
+function test3() {
+  ok(contentWindow.GroupItems.groupItems.length, 1, "Only one group item exists");
+  groupItem = contentWindow.GroupItems.groupItems[0];
+
+  is(groupItem.getChildren().length, 1, 
+     "The number of tab items in the group is 1 before right button double click");
+
+  // first click
+  mouseClick(groupItem.container, 2);
+  // second click
+  mouseClick(groupItem.container, 2);
+
+  is(groupItem.getChildren().length, 1, 
+     "The number of tab items in the group is 1 after right button double click");
+  test4();
+}
+
+function test4() {
+  is(groupItem.getChildren().length, 1, 
+     "The number of tab items in the group is 1 before left, right, left mouse clicks");
+
+  // first click
+  mouseClick(groupItem.container, 0);
+  // second click
+  mouseClick(groupItem.container, 2);
+  // third click
+  mouseClick(groupItem.container, 0);
+
+  is(groupItem.getChildren().length, 1, 
+     "The number of tab items in the group is 1 before left, right, left mouse clicks");
+
+  hideTabView(function() {
+    is(gBrowser.tabs.length, 1, "Total number of tabs is 1 after all tests");
+
+    contentWindow = null;
+    contentElement = null;
+    groupItem = null;
+
+    finish();
+  });
+}
+
+function mouseClick(targetElement, buttonCode) {
+  EventUtils.sendMouseEvent(
+    { type: "mousedown", button: buttonCode }, targetElement, contentWindow);
+  EventUtils.sendMouseEvent(
+    { type: "mouseup", button: buttonCode }, targetElement, contentWindow);
+}
+