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
That won’t help when you must use it for any online access to (for example) your bank, any loan application, school enrollment, car maintenance, online shopping, tax filing, airline tickets, passport renewal, license3 renewal, mortgage payment, etc., etc .