diff -r 000000000000 -r 6474c204b198 browser/components/sessionstore/test/browser_659591.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/sessionstore/test/browser_659591.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  let eventReceived = false;
+
+  registerCleanupFunction(function () {
+    ok(eventReceived, "SSWindowClosing event received");
+  });
+
+  newWindow(function (win) {
+    win.addEventListener("SSWindowClosing", function onWindowClosing() {
+      win.removeEventListener("SSWindowClosing", onWindowClosing, false);
+      eventReceived = true;
+      waitForFocus(finish);
+    }, false);
+
+    win.close();
+  });
+}
+
+function newWindow(callback) {
+  let opts = "chrome,all,dialog=no,height=800,width=800";
+  let win = window.openDialog(getBrowserURL(), "_blank", opts);
+
+  win.addEventListener("load", function onLoad() {
+    win.removeEventListener("load", onLoad, false);
+    executeSoon(function () callback(win));
+  }, false);
+}