Might actually be bug 14911. Trying one of the hints from that bugreport XLIB_SKIP_ARGB_VISUALS=1 firefox, did the trick. I can now go to all pages that didn't work before.
-- Firefox crashes on some pages https://launchpad.net/bugs/68586 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
