I had the same issue where it would hang and not generate thumbnails for HTML . I ended up un-installing any beta Firefox web browsers and xulrunners that weren't with the regular Ubuntu repos, now everything works again. I also tested the OP link and it worked fine.
-- In karmic the program hangs on anything https://bugs.launchpad.net/bugs/445338 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs