Personally, I find that this [0] doesn't break many sites at all, but messes with cookies to an appreciable extent. Combine this to an extensive use of that [1] and clearing your cache and cookies every day, and I think you're in decent shape while some heavy and heavily lobbied government body inches towards doing something about it.

[0] uBlock Origin

https://addons.mozilla.org/en-US/firefox/addon/ublock-origin...

[1] Firefox Multi-Account Containers

https://addons.mozilla.org/en-US/firefox/addon/multi-account...