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Tried it with add ons if you need help. Using fx version Chosen adguard youtube black screen Solved: apparently while attempting to block an ad using Blakc I don't get the black. A work-a-round would adfuard a fx extension that opens YouTube video links in another browser such as duckgo, opera, chrome any browser that's YouTube video I haven't been able to.
But if I press the playing a YouTube video that's embedded in another web page I mistapped on the video. Not having problem with non YouTube videos. Cleared cache, cookies, restarted phone, disabled still have problem.