Ha, this caught me off guard too, but even though it's still listed after restarting Firefox, the permissions have been removed.  If you select the cert and click edit, you can see the permission boxes are no longer checked where they were before.  See <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=173729" rel="nofollow">https://bugzilla.mozilla.org/show_bug.cgi?id=173729</a> for details.<p>[Edit: At least this is the case on Windows.  File a bug report as sandGorgon suggested if that's not the case.]