The UI isn't as pretty, but Firefox does support fully separated profiles. More info at https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-f

The UI isn't as pretty, but Firefox does support fully separated profiles. More info at https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles https://support.mozilla.org/en-US/kb/profile-manager-create-... You can also use command line flags to do the same. For example, you can run `firefox --profile $(mktemp -d) --new-instance` to create a temporary, throwaway profile. (Change --new-instance to --no-remote on Windows).