Two (or more) instances of Firefox running at the same time

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When Firefox is running and you try to open another Firefox process, a new window is opened instead, in the already running process. You can use the -no-remote command line option to start a new Firefox process that is invisible to the first process

 

Articulo: http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_with_another_profile