After just following the steps above, visiting enum.cn shows the "This Connection is Untrusted" dialogue for me on Windows. According to the bug report here: h

After just following the steps above, visiting enum.cn shows the "This Connection is Untrusted" dialogue for me on Windows. According to the bug report here: https://bugzilla.mozilla.org/show_bug.cgi?id=173729 https://bugzilla.mozilla.org/show_bug.cgi?id=173729 I believe the steps above are all you should need to do.