I was able to get a backtrace with libpixman debug symbols. The problem persists, but I was able to browse various other pages of the site before X hung again.
** Attachment added: "gdb-Xorg-direct2.txt" https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/822885/+attachment/2262652/+files/gdb-Xorg-direct2.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/822885 Title: Firefox makes X hang when viewing big images To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/822885/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs