r/waterfox

https://preview.redd.it/ybfv119l8ath1.png?width=1231&format=png&auto=webp&s=dbad6715b5505dc5ab2de4986460d3c66f8963bb

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I'm trying to watch Fleabag on Amazon Prime Video
but for some reason i can only hear sound but no video is being played ( only the black screen is there while captions and continue as usual
Any clue what should i do.

Is there anyway to remove it? I managed to kill rss, add to bar, and reader but can't see the about:config setting.

everytime I open a video in full screen or get out of full screen it does a black screen transition, I've tried to check waterfox video settings but found nothing to change it