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The only time I have had friction with profiles, is with some Google SSO as I use an unofficial extension called Google Container and sometimes the redirect just doesn't work.
https://addons.mozilla.org/en-US/firefox/addon/google-contai...
https://github.com/stoically/temporary-containers/issues/618
Surprised no one mentioned Linux Mint's Webapp Manager:
https://github.com/linuxmint/webapp-manager
Should be in more distros. Allows some basic tweaking of profiles and supports more than just Firefox (unfortunately not qutebrowser, though).