diff -r 000000000000 -r 6474c204b198 toolkit/mozapps/downloads/tests/unit/head_downloads.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/mozapps/downloads/tests/unit/head_downloads.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,5 @@
+Components.utils.import("resource://gre/modules/Services.jsm");
+
+do_register_cleanup(function() {
+  Services.obs.notifyObservers(null, "quit-application", null);
+});