For those that really need an earlier version of Firefox, find your system and the Firefox version you want in releases, download and start the install. * ftp://ftp.mozilla.org/pub/firefox/releases/ :or with the latest of version 3 * http://www.mozilla.com/firefox/all-older.html When reinstalling Firefox from a download, Firefox must be down once the installation starts. When the installation finishes, don't let the install start firefox for you. Instead end the install and start Firefox in your normal manner, thus preventing creating a new profile which does not have your bookmarks cookies, etc (but your old profile would still be around and would).