diff -r 000000000000 -r 6474c204b198 toolkit/identity/tests/unit/tail_identity.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/identity/tests/unit/tail_identity.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+
+// pre-emptively shut down to clear resources
+if (typeof IdentityService !== "undefined") {
+  IdentityService.shutdown();
+} else if (typeof IDService !== "undefined") {
+  IDService.shutdown();
+}
+