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[YouTube Ad Related Post]
Just sharing this here as I've heard a lot of people have started getting ads, if you use Firefox you should be able to continue using adblock by disabling the Quickfixes filter list in Ublock: Filter Lists -> Ublock Filters -> Uncheck "Ublock Filters - Quickfixes".
I actually use Brave and don't have an issue (yet), but I think they're doing A/B testing so that may be why.