mozilla/kuma — pull request #2718 by darkwing (2014-08-28 21:16:10+00:00)
Title: fix bug 1060050 - Prevent duplicate processing of notifications

Fixes: https://bugzilla.mozilla.org/show_bug.cgi?id=1060050

To test:
1. Create a growl that doesn't close
2. Run mdn.Notifier.discover()

The notification doesn't get another icon! :)