diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug619937.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug619937.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  window.addEventListener("tabviewshown", onTabViewWindowLoaded, false);
+  TabView.toggle();
+}
+
+function endGame() {
+  window.removeEventListener("tabviewhidden", endGame, false);
+  ok(!TabView.isVisible(), "Tab View is hidden");
+
+  finish();
+};
+
+function onTabViewWindowLoaded() {
+  window.removeEventListener("tabviewshown", onTabViewWindowLoaded, false);
+  ok(TabView.isVisible(), "Tab View is visible");
+
+  let contentWindow = document.getElementById("tab-view").contentWindow;
+
+  // establish initial state
+  is(contentWindow.GroupItems.groupItems.length, 1,
+      "we start with one group (the default)");
+  is(gBrowser.tabs.length, 1, "we start with one tab");
+  let originalTab = gBrowser.tabs[0];
+
+  let bg = contentWindow.document.getElementById("bg");
+
+  EventUtils.sendMouseEvent({ type: "click" }, bg, contentWindow);
+
+  is(contentWindow.GroupItems.groupItems.length, 1,
+      "we should still only have one group");
+
+  window.addEventListener("tabviewhidden", endGame, false);
+  TabView.toggle();
+}