How do I downgrade firefox 4 to firefox 3.6?

Visit the Firefox webpage.
Locate Firefox downloads.
Locate English A FEW.6
Set up.

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

Simplest way to do the item.Go to the above link and down load firefox A FEW.6.Uninstall firefox as well as reinstall the 3.6 package.

http://facebook25.blogspot.com/2011/04/how-to-remove-latest-firefox-update.html

download THREE.6
uninstall firefox
manage the installer.