Embedded YouTube video is blocked if its link starts with http://
There is an iframe with the following src (http://www.youtube.com/embed/MRT42zVbhOY) on the specified page (see 'Problem URL').
The video is not shown due to the error: Blocked loading mixed active content "http://www.youtube.com/embed/MRT42zVbhOY" (see Mixed content - Web security | MDN).
Changing "http://" to "https://" resolves the problem.
Take a look at the GIF.
Test environment: Firefox Quantum 65.0 (64-bit).
- Problem Source
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