diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug766597.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug766597.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,61 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  let tContextMenu = document.getElementById("tabContextMenu");
+  let tvMenuPopup = document.getElementById("context_tabViewMenuPopup");
+  let group1;
+  let group2;
+
+  function openMoveToGroupPopup() {
+    let tab = gBrowser.selectedTab;
+    let tvMenu = document.getElementById("context_tabViewMenu");
+    let tvMenuPopup = document.getElementById("context_tabViewMenuPopup");
+    let tvEvent = new Event("");
+
+    tab.dispatchEvent(tvEvent);
+    tContextMenu.openPopup(tab, "end_after", 0, 0, true, false, tvEvent);
+    tvMenuPopup.openPopup(tvMenu, "end_after", 0, 0, true, false);
+  }
+
+  function hideMoveToGroupPopup() {
+    tvMenuPopup.hidePopup();
+    tContextMenu.hidePopup();
+  }
+
+  function createGroups() {
+    let cw = TabView.getContentWindow();
+
+    group1 = createGroupItemWithTabs(window, 200, 200, 20, ["about:blank"]);
+    group1.setTitle("group with items and title");
+    group2 = createEmptyGroupItem(cw, 200, 200, 20);
+    cw.UI.setActive(cw.GroupItems.groupItems[0]);
+
+    // Check the group count.
+    is(cw.GroupItems.groupItems.length, 3, "Validate group count in tab view.");
+
+    hideTabView(checkGroupMenuItems);
+  }
+
+  // The group count includes the separator and the 'new group' menu item.
+  function checkGroupMenuItems() {
+    // First test with an empty untitled group.
+    openMoveToGroupPopup();
+    is(tvMenuPopup.childNodes.length, 3, "Validate group item count in move to group popup.");
+    hideMoveToGroupPopup();
+
+    // Then test with an empty but titled group.
+    group2.setTitle("empty group with title");
+    openMoveToGroupPopup();
+    is(tvMenuPopup.childNodes.length, 4, "Validate group item count in move to group popup.");
+    hideMoveToGroupPopup();
+
+    // Clean 
+    closeGroupItem(group1, function() { closeGroupItem(group2, finish); });
+  }
+
+  showTabView(createGroups);
+}
+