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.

https://support.mozilla.org/kb/profile-manager-create-remove...

The most important part of profiles is being able to right-click on a link and open it in a different profile. I don't see that mentioned. I typically have multiple profiles open at once.

Edge has the best implementation where you can define sites opening in certain profiles. Pity ms ruined that browser - it is completely untrustworthy with it auto turning on options such as syncing.