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YouTube is now fully blocking ad blockers around the world
(9to5google.com)
This is a most excellent place for technology news and articles.
I only use Firefox for youtube and nothing else... it still just works the same as ever - the only ads I see are the ones the creators make themselves for sponsors. I only use Chromium-based browsers for anything that has nothing to do with google...
Try Sponsorblck. It can block sponsors, and a couple of other things. You can also set a skip button for specific segments and skip them if you want. Users like you can mark sponsor and other segments for others to be able to skip.