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Firefox Has Quietly Integrated Brave's Adblock Engine
(itsfoss.com)
This is a most excellent place for technology news and articles.
They should have built it in years ago, but called it "web security filtering" or something and included only a basic security blocklist, but left it easy to add other lists.
still it wasn't blocking ads, and even I as a poweruser was not aware that I could add externally maintained ad blocklists