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
Time for me to start donating to Firefox. Need to do my part to make sure Chrome doesn’t complete its monopoly
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. In other words, your money don't go towards FF development.
However in theory the more self sustaining the Foundation is, the less the Corp needs to support it.
I don't think it works like this. Anyway, your money, your choice.
Except websites can just drop support for incompatible browsers.
So then stop going to those websites. It's a viable way to protest.
FireFox already supports DRM. Sites like Hulu/Netflix already refuse to work without it