

(Re)vanced ftw!
I’ve pretty much exclusively use Revanced (and the original Vanced before that) to watch YouTube over the last 10ish years. 0 ads, sponsor block, remove UI elements I’ll never use like the upload button, force a preferred video resolution instead of ‘auto’ never working (seprate ones for wifi/data).
Vanced never once failed on me; Revanced has failed to play videos twice in 5 years, right after YouTube updates, but reinstalling the latest version immediately fixed that both times.
It’s clunky, but I can open files in firefox by using a file browser app (I use x-plore), selecting ‘open with’, then selecting firefox. Sometimes it’s not in the list, but there’s a selector for what type of file (text, video, audio, ‘*’). ‘*’ lists all the apps.
Sometimes stuff still refuses to open, but things like pdfs and html files usually work