I had one recently that (when changing / creating the password) would allow you paste into the “new password” field but not the “confirm password” field. Super annoying.
I just opened dev tools, pasted it into the “value” property for the control, and kept on truckin’. Just nuts that had to be done though.
I have several Tampermonkey scripts to keep Youtube useable:
Additionally uBlock, and a plugin to alter the number of results per row (so I don’t wind up with gigantic tiles/icons on a large monitor).
It’s a complete disaster without these. :/