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how to open two copies of ffx at same time, using two different profiles?

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how to open two copies of ffx at same time, using two different profiles? I want two sets of tabs available.

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See this KB article: http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile

That is not officially endorsed by Mozilla, and it is fraught with perils, use at your own risk to losing data or other problems.