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How do I start Firefox using two different profiles at the same time?

I have two profiles (profileA, profileB).

firefox -P profileA
firefox -P profileB

I would like to start two Firefox instances with different profiles. The above commands don't seem to work. What am I missing here?

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firefox -no-remote -P profile_name seems to work – Joshua Jul 29 '11 at 4:36
so have you answered your question? if so, do that as an answer and accept it :) – nik Jul 29 '11 at 5:57

For that I use ProfileSwitcher.

About this Add-on:

This extension makes easier to use more profiles in Firefox and Thunderbird. It adds in the File menu two new items to start another profile or the profile manager. From the extension's preferences, you can choose what to do when you launch another profile (close the one in use, don't close it, ask every time - If you choose to run the profile manager in safe-mode, the current profile will be always closed). Moreover it adds the name of the profile in uso in the titlebar (on Thunderbird) or as tooltip in the statusbar or in a panel in statusbar (on Firefox) or as icon in statusbar

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