Safari Introduces Profiles
theverge.com
1 thread
Seems like this is similar to the container functionality in Firefox.
Firefox containers are quite a bit more limited.
Profiles not only separate cookies but also extensions, bookmarks, history, and tab groups.
Firefox also has profiles, as does Chrome. Firefox does not provide a nice interface for them, and so a lot of people aren't aware of them. To see the Firefox profile interface go to about:profiles.