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YouTube is finally cracking down on third-party apps that enable ad-blocking
(alternativeto.net)
This is a most excellent place for technology news and articles.
They probably will eventually, but it's just not priority. Most people interact with YouTube via Chrome (or one of the 400,000 rebranded Chromimum browsers) or the YouTube app, both of which Google can more tightly control. Firefox, with it's smaller market share, just isn't worth chasing... yet.