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by callahad 3134 days ago
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-...

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).