Steps to reproduce: 1) Log on to facebook 2) Click anyone in the friends list on the right - browser crashes immediately. I believe this is related to JS, but I'm not sure. I install updates periodically, and this crash started happening after 2013-07-29 update, still here on 6.0.5 (8536.30.1, 538+).
Bug #119384 reports the same problem, also provides a crash log. Thanks for reporting. *** This bug has been marked as a duplicate of bug 119384 ***