looks like rendering adblockers extensions obsolete with manifest-v3 was not enough so now they try to implement DRM into the browser giving the ability to any website to refuse traffic to you if you don't run a complaint browser ( cough...firefox )
here is an article in hacker news since i'm sure they can explain this to you better than i.
and also some github docs
Ad Blocking is cyber security
Every once in a while I help a family member or friend out with their machine and am stunned when I see the web without an adblocker. It honestly reminds me of the malicious early 2000s porn and “free downloads” sites… but it’s everywhere now, like cnn and eBay and shit. First thing I do is install Firefox and ublock origin, and mostly for their security.
Youtube has also been running basically porn ads on “for kids” youtube channels as well and my kindergarten aged niece and nephew have been exposed to that shit. Adblock is 100% cyber security AND for kids safety.
I installed uBlock Origin on clients computers when I worked at Geek Squad, even.