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 is exactly why everyone should donate to Mozilla so they can stop being reliant on the Google search deal in Firefox.
The sad part is Mozilla is more of a political organization than just the developers of Firefox now. So you're donating for their lobbying, not just browser development.
Firefox needs new ownership. But it's kinda hard considering how big of a project a browser is nowadays.
Not even a single dime can go towards FF development, as it is done by a Corporation (Mozilla Corp.) which can't legally take donations.
You can’t legally donate to Firefox, as it is developed by a Corp (Mozilla Corp.).
Donations go to Mozilla Foundation, which does… other things with you money (advocacy and, frankly speaking, a lot of unrelated crap) In other words, your money don’t go towards FF development, so you may want to think twice before donating.