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Where can I find Firefox 3 to download?

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Need the following add-on that does not work with Firefox 4. https://addons.mozilla.org/en-US/firefox/addon/microsoft-net-framework-assist/eula/86332 I've been told to uninstall 4 and install 3.5 or 3.6 but can only find version 4 for download.

Need the following add-on that does not work with Firefox 4. '''https://addons.mozilla.org/en-US/firefox/addon/microsoft-net-framework-assist/eula/86332''' I've been told to uninstall 4 and install 3.5 or 3.6 but can only find version 4 for download.

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Version 3.6.16 is available here:

http://www.mozilla.com/en-US/firefox/all-older