What's going on with youtube?

Question

YouTube

For some strange reason, when entering any page of the youtube official site, the entire interface turns into white blocks, sometimes (for example, when changing the position of the cursor on the page) changing to ordinary elements.

Why does this happen, and how to prevent it?
(and yes, most likely, my extensions have nothing to do with it)

Answer 1

Maybe Youtube doesn't support the theme you installed in one of these extensions: It could also be that Stylus and Stylish are used at the same time.