Addition: The problem does only occur when starting firefox by clicking on a link (any link, http or https makes no difference) in thunderbird.
If I start firefox from the panel or eg. by right-clicking on a link in gnome-terminal everything works fine. ** Summary changed: - Opening firefox by clicking on https link breaks https + Opening firefox by clicking on links in thunderbird breaks https -- Opening firefox by clicking on links in thunderbird breaks https https://launchpad.net/bugs/57923 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs