I've been using first party isolation ever since it was ported from Tor. It's excellent, but be aware that it breaks stuff, usually JavaScript, on about 5% of w

I've been using first party isolation ever since it was ported from Tor. It's excellent, but be aware that it breaks stuff, usually JavaScript, on about 5% of websites (anecdata). I find this to be well worth it, especially to find out which sites do the worst tracking. I have a separate Firefox profile I use for rare occasions when I need to allow third party tracking in order to do something.