There's a browser extension called Unhook for YouTube. It lets you hide any part of the UI. The comments, the recommended videos on the side, the popups at the end of videos, etc. I didn't even realize how mentally taxing it was to have all that crap shoved in my face while I'm trying to focus.

I code as if Men in Black will come and wipe my memory after I'm finished.

Don't do it. Turn back. I'm living that life to the extreme.