How to install two different versions of firefox in same OS ?

please help as i need both of them
some plugins not working in the new one !!

Do a custom install and install each version in its own program folder to use multiple Firefox versions.
* [[Custom installation of Firefox on Windows]]
Create a new profile exclusively for each Firefox version and create a desktop shortcut with -P "profile" appended to the target to launch each Firefox version with its own profile.
See these mozillaZine KB articles for information:
* http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
* http://kb.mozillazine.org/Shortcut_to_a_specific_profile
* http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox

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How to install two different versions of firefox in same OS ?

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