Not really without you providing more information. Which videos don’t work? What happens - do you get an error message? What have you tried so far? Do you have any extensions? What device are you on? etc etc.

It’s not possible to help properly just from “videos don’t play” and nothing more.

With nothing more to go on I’d suggest a fresh install. Remove the app entirely from your device, redownload it and don’t install any extensions or even sign in. Retest, and if the problem is fixed then slowly begin to reconstruct your old setup one step at a time, retesting as you go.

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

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

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