you do not have to worry about anything other than what you'd like to play. you could do everything randomly and you'd still make a pretty good character
they either installed some crappy copy like you said, or youtube had an anti-adblock update (that ublock devs patch very quickly) and they don't know what happened, so they made up a story about the browser's owner editing extensions in their addons page or whatever
FWIW... That's Ublock Origin NOT from any browser's app store. 🤌🏼
edit: if this is the first time you're hearing that "app stores" have modified all ad-blockers they offer to allow the ads they choose...you might be one of these moronic downvotes. 🤦🏼♂️
what is a "browser app store"? do you mean the addons/extensions page?
what extension have you downloaded that made you think the browser's owner can edit the extensions? are you just making stuff up?
i've always used uBlock Origin in firefox and it never showed any ads except for youtube a couple of times because of anti-adblock updates from youtube, that were quickly patched by ublock!
you do not have to worry about anything other than what you'd like to play. you could do everything randomly and you'd still make a pretty good character