Run Portable FireFox & Installed FireFox Simultaneously

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Portable version of Firefox does removes headache of installation as well as you can carry in your USB flash drives. However if you already have one version of Firefox installed on your computer then you cannot run another version of Firefox or portable Firefox simultaneously.
If you want to run different version of Firefox simultaneously then TwinFox can come handy. TwinFox is AutoIT script which when placed within portable Firefox folder lets you to run Portable Firefox & installed Firefox together.

Download TwinFox

http://michtatools.googlecode.com/files/TwinFoxV1.zip