(Note: this is filed as part of the “Paper Cut” bugs — we assume that there may be multiple existing bugs on this. Please make them block this bug, and we will de-dupe if they are indeed exactly the same. Thanks!) To reproduce: 1. Open Facebook and the chat window 2. Open other websites in tabs 3. Facebook chat causes crashes, and steals focus from your other window when someone messages you. Recommendation: Work with Facebook chat to find the crash issues.

Do we have specific stacktraces on these crashes?

There are lots of bug related to this: https://bugzilla.mozilla.org/show_bug.cgi?id=504378 https://bugzilla.mozilla.org/show_bug.cgi?id=430436 https://bugzilla.mozilla.org/show_bug.cgi?id=502735 https://bugzilla.mozilla.org/show_bug.cgi?id=504070 https://bugzilla.mozilla.org/show_bug.cgi?id=542933 This bug itself can be considered a DUPE.