This looks like a jave issue not firefox. Please see https://launchpad.net/distros/ubuntu/+source/firefox/+bug/47763
Dave ** Changed in: firefox (Ubuntu) Status: Needs Info => Confirmed -- When visiting www.map24.com Firefox starts hanging permanently after a few seconds. https://launchpad.net/bugs/68538 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs