In the TabbedBrowsingAPI we are using a controller variable while we would have to use this._controller. I haven't seen a failure for those specific failures so far. But lets get this fixed.
Created attachment 481486 [details] [diff] [review] Patch v1
Comment on attachment 481486 [details] [diff] [review] Patch v1 Makes sense. Thanks, r+
Landed as: http://hg.mozilla.org/qa/mozmill-tests/rev/e5d28b9aa68d (default) http://hg.mozilla.org/qa/mozmill-tests/rev/4e30174c0881 (mozilla1.9.2) http://hg.mozilla.org/qa/mozmill-tests/rev/28e3a65f7fda (mozilla1.9.1)
Move of Mozmill Test related project bugs to newly created components. You can filter out those emails by using "Mozmill-Tests-to-MozillaQA" as criteria.