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Can’t you change the user profile in the command line with a flag? Surprised it takes this long to implement that in a gui fashion.

There's already a GUI (launch firefox with the --profileManager command line flag), but it's very barebone.

This flag and the UI seems to go back to (at least) Netscape 7 in 2002, btw.

And also about:profiles, with the same caveat.

You can open different profiles by typing about:profiles into the address bar.