Comment 7 for bug 531583

This looks like a dupe of https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/518422 which points to mozilla bugzilla https://bugzilla.mozilla.org/show_bug.cgi?id=533535

This one is marked Importance high, but the older bug with more details and (poor) workaround hasn't been tagged by ubuntu folk.