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
This. I see a lot of talk about Firefox forks on Lemmy but at the end of the day we need Mozilla to to survive for Firefox and their forks to continue