Comment 5 for bug 996697

This is wrong because it will be impossible to open such URLs without modifying system certificates and without any means to find out which one is needed. See bug 706857.

Short of the full UI, checking the certificate and showing an error page with a Continue button would make sense to me. See https://bugs.launchpad.net/midori/+bug/706857/+attachment/3143468/+files/gcr-icon-click.diff - unfortunately doesn't work for me, takers welcome.