How can I run both versions of Firefox at the same time?

Alright, so I decided to install the Firefox 4 beta 3 as a test sort of thing. But now it's set as the default browser, and, no matter what I do, I can't switch back to the old one! I can't use any of my old add-ons now!

If you are want to test pre-release versions of Fiefox it is best to use a different profile for each version, and then create shortcuts to launch Firefox using the correct profile for each version. Firefox store user data in profiles, pre-release versions of Firefox can make changes to the profile that cause it not to work in older versions of Firefox.
Some articles that can help you from the MozillaZine knowledge base:
* [http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows Creating a new Firefox profile on Windows]
* [http://kb.mozillazine.org/Shortcut_to_a_specific_profile Shortcut to a specific profile]
* [http://kb.mozillazine.org/Starting_your_Mozilla_application_with_a_specified_profile Starting your Mozilla application with a specified profile]
Some further background reading:
* [http://kb.mozillazine.org/Testing_pre-release_versions Testing pre-release versions]
* [http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox Using multiple profiles]

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