Addidional nemises include X, Facebook & Rumble. My computer actually turns OFF. And if it doesn't turn off, after a few minutes, I have no sound or the video freezes. This doesn't happen on other browsers or on videos I play straight from my pc. ...
I also have problems on twitter when using firefox, i.e. playing videos on twitter causes my PC to actually turn off (no, it's got a great cooling system).... Maybe they don't like twitter?