Bug #218563 is this one, so you're propbably talking about Bug #218908 - there is a workaround which helped me and Steffen Banhardt seems to have found the problem.
-- Firefox can't display error pages anymore https://bugs.launchpad.net/bugs/218563 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
