Multi process of Firefox

Hi,
We are 3 using RDProtocol to a remote machine. I just installed Firefox and what a surprise when everyone want to use Firefox in the same time, a problem happens : Just one can use it, while the others get this message: "Firefox is already running....Close the process"
Isn't Firefox multi-process ? We tried some other browsers and oddly the problems does NOT happen. For my mind I'd like to use Firefox mainly for HTML developing and firebug.
Is here someone able to help me?
Config: Windows 2003 server
Firefox 13.0.1
Thank in advance

Does the error occur when everyone logs in as the same Windows user, or when they log in as separate Windows users, or both?
To run isolated sessions of Firefox, you need to make a few configuration changes. Please see cor-el's solution in this thread: https://support.mozilla.org/en-US/questions/925594#answer-327043

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