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Running Multiple Instances of Firefox  |  (2006/09/17 20:30)

I find it really useful to be able to run multiple instances of Firefox in order to do web testing as well as to support running things like Tor.
Firefox doesn't support this out of the box, but there's a quick tweak you can use to enable this.
You need to do the following:
  • Set the environment variable MOZ_NO_REMOTE=1 (My Computer->Properties->Advanced->Environment Variables
  • Create new profiles with "firefox -profilemanager"
  • Run "firefox -P profilename"

I also use a different theme for each profile so I have a visual hint which profile I'm running.

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