I think I got the same bug. I had 3 tab opened and a tab with a pdf on acroread plugin. I think the bugs comes from that last one.
crash report : http://bilfous.free.fr/Datas/_usr_lib_firefox_firefox-bin.1000.crash -- firefox crashes when closed by close buttonretr https://launchpad.net/bugs/78028 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
