diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug655269.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug655269.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  newWindowWithTabView(function (win) {
+    let cw = win.TabView.getContentWindow();
+
+    win.addEventListener("SSWindowClosing", function onClose() {
+      win.removeEventListener("SSWindowClosing", onClose);
+
+      executeSoon(function () {
+        ok(cw.UI.isDOMWindowClosing, "dom window is closing");
+        waitForFocus(finish);
+      });
+    });
+
+    win.close();
+  });
+}