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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.
No company that doesn't allow you to install browser add-ons will allow you to run a pi-hole instance. Not on your machine, and much less as an actual pi plugged into their network. If you did plug an actual pi into the network it would probably reason to be just straight up fired.