i found out, that after closing all firefox windows (also the download window!) at the next start the problem is gone
-- Undefined entity error when accessing site with invalid SSL certificate https://bugs.launchpad.net/bugs/555489 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
