Firefox 85 cracks down on supercookies
Use uBlock Origin, Multi Account Containers, Privacy Badger, Decentraleyes and CookieAutoDelete with Firefox. Make sure you aggressively clear cache, cookies, etc., periodically (with CookieAutoDelete). You’ll probably load the web servers more and also add more traffic on your network, but it will help protect your privacy since most websites don’t care about that. When websites are user hostile, you have to take protective measures yourself.