To "downgrade" Firefox 3 Beta 5 to Firefox 2 in Hardy:
1. First make a list of any extensions you've installed in FF3 that you want in FF2. Simply uninstalling FF3 and installing FF2 on top of the same Firefox profile will break your extensions. You also should back up your saved sessions and anything else you want to save. Your bookmarks can be backed up to your home folder with this command:
Code:
cp ~/.mozilla/firefox/*.default/bookmarks.html ~
2. To uninstall FF3, wipe your profile, and install FF2, run these commands in the terminal:
Code:
sudo apt-get purge firefox-3.0
rm -r ~/.mozilla/firefox
sudo apt-get install firefox-2