javascript: execution is disabled on medium-high security level on HTTPS website

With the security slider on Medium-High we disabled JavaScript execution on non HTTPS websites. However, it seems we are overly strict here as javascript: execution on HTTPS sites is not working either. This got reported on our blog:

https://blog.torproject.org/blog/tor-browser-604-released#comment-203337

https://bug1259785.bmoattachments.org/attachment.cgi?id=8734814 is the testcase mentioned there.

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