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With Firefox you can create a new profile from the command line

firefox -CreateProfile JoelUser

However I have found that this only works when Firefox is closed. If Firefox is open the command merely opens a new window, and does nothing more.

I can work around this by manually creating the folder and editing profiles.ini, but should it work from the command line as well?

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up vote 2 down vote accepted

Something of a workaround is to invoke Firefox like this

firefox -no-remote -profile JoelUser

This will create a new profile in the current directory, then launch Firefox.

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