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Firefox's Profiles get a huge upgrade with easier Profile Creation, Switching and Customization
(windowsreport.com)
A place to discuss the news and latest developments on the open-source browser Firefox
It already just works, just go to about:profiles and launch as another profile. There's also have container tabs, so no need for a separate profile when you only need isolation.
Would be nice if they just added a profile manager with a button though.
I just have about:profile as the first on my bookmark toolbar. You can also make a shortcut to
firefox --ProfileManager
in your OS.