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On a #lifeHack I've talked about previously: how are :firefox: containers and first-party isolation different?

Basically, because a container stops stuff outside of it from reading private data, and FPI stops websites outside the one you're visiting. So if you have e.g. just a single container with Google and Twitter pages, they can read each other's data. If you only have FPI enabled, you can't have different sessions of that same website.

https://www.reddit.com/r/firefox/comments/88ngul/is_first_party_isolation_to_each_domain_being/dwlyby2/