Multiple Firefox Instances

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This tip happens to be my favorite Firefox tip/tool. With it, you can run many instances of Firefox with different Profiles and different Firefox versions at the same time.
The benefits:

1. Run test and beta versions of Firefox without affecting your
2. default Firefox configuration,
3. Use different Profiles for different users without having to shutdown Firefox
4. Test new extensions and themes in a new Profile beforeincorporating them into your default Firefox Profile other uses which you’ll discover as you use this tip.

Follow these simple step to get it in action.

1. Open Notepad 
2. paste in the following:

@echo off
set MOZ_NO_REMOTE=1
start "" "C:\Program Files\Mozilla Firefox\firefox.exe" -p
set MOZ_NO_REMOTE=0

3. Save the file with any name that you wish, and in any location, but you’ll be saving it as a .bat.

Now assuming that you have more than one Profile, when you double click on the .bat file, the Profile Manager should open up allowing you to choose aProfile to run in addition to your currently opened Firefox Profile.
See The Profile Manager to learn how to create new Profiles.