Yeah I get issues with video playback sometimes as well. Usually when I try to go full screen, crashes Firefox usually. Not sure if it is my phone or what, but I have gotten used to it, usually after the third time it works

You said you use extensions and yet you didn’t list any of them

yes I do use extensions, I’m on android , and it’s all videos, none will play at all , I press the video to plat but nothing happens , it just won’t play at all , I’ve tried all kinda vids and still the same