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Anyone else getting these tiny rectangular windows that pop in sideways from the top right or bottom left of the youtube video screen? I've just recently started seeing them. They pop in for a few seconds and then disappear before I can attempt to block them. Is there a filter for this? Thanks!

if you are talking about annotations, login your account, go to
https://www.youtube.com/account_playback

and uncheck "Show annotations, channel promotions and interactive cards on videos"

Thanks, but when I click the "disable annotations" button it's checked again the next time I login. I also use the youtube "pure video experience" filter list, but for some reason I'm now getting these little annotations.

well, if you save the settings it should be ok. Disable all other extensions / addons, try to modify again the settings and save them. It works fine for me.