Remember to use Firefox containers, then you can accept all the cookies you want and they will never see outside of the container (you have to put the website in a container though)
That would run the risk of the user agent displaying as chromium. So you would still need to change the user agent, which I’m not sure why you wouldn’t do that to begin with
I never went to the browser though because their “pay us and we’ll totally give it to the websites you want if they request it” was enough for me to avoid it
🦀