diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_bug481560.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_bug481560.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+function test() {
+  waitForExplicitFinish();
+
+  var win = openDialog(getBrowserURL(), "_blank", "chrome,all,dialog=no");
+
+  win.addEventListener("load", function () {
+    win.removeEventListener("load", arguments.callee, false);
+
+    win.content.addEventListener("focus", function () {
+      win.content.removeEventListener("focus", arguments.callee, false);
+
+      function onTabClose() {
+        ok(false, "shouldn't have gotten the TabClose event for the last tab");
+      }
+      var tab = win.gBrowser.selectedTab;
+      tab.addEventListener("TabClose", onTabClose, false);
+
+      EventUtils.synthesizeKey("w", { accelKey: true }, win);
+
+      ok(win.closed, "accel+w closed the window immediately");
+
+      tab.removeEventListener("TabClose", onTabClose, false);
+
+      finish();
+    }, false);
+  }, false);
+}