diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug728887.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug728887.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  showTabView(function () {
+    let cw = TabView.getContentWindow();
+    let target = cw.GroupItems.groupItems[0].container;
+    EventUtils.sendMouseEvent({type: "dblclick", button: 0}, target, cw);
+    is(cw.GroupItems.groupItems.length, 1, "one groupItem after double clicking");
+
+    hideTabView(finish);
+  });
+}