I had an issue as well. If you have already tried HOSTS or JS fixes previously:
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Clear any edits to your HOST file.
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Clear any edits to QR JS in options menu.
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Clear History and Cache in your browser.
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Restart browser and go to QR
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Once in the bread, now add the JS
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Refresh.
I use Windows 10, Chrome. Everything works with the exception of .mp4s.
Be sure to start Notepad in Admin mode to edit HOST file. Good luck, anon.