uBlock Origin + Cookie Notice blocklists also work fine.
I started to write this comment meaning to add that Firefox does it all by itself now, but I just read that such feature "is not currently available anymore".
Using uBlock to hide the cookie banners mostly works, but there are occasional websites where it's buggy: I have to disable uBlock, accept or reject cookies, then re-enable uBlock.
So some websites actually require an accept/reject, and don't work if just visually hiding the banner, which is what this does.
Do any browsers support running a minified LLM on device through an extension?
Training an LLM to reject optional cookies (or better yet, fuck with the telemetry) would seem highly doable nowadays.