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>isolated browser profiles

Firefox can do that. Just run firefox -p.

>tied to an account

Is that really necessary?

> Is that really necessary?

Yes, I'd like extensions, history, cookies, etc to be tied to the account and have them be isolated. I can't do that now.

You can. Firefox profiles are totally isolated, including extensions, history, cookies and everything else. Why this isn't enough for you?

You can log in into accounts in each profile, of course, if you want.