''If the answer you see did not work for you, did you reply to ask for more information or which part of a solution you were having a pr0blem with, that would not only help you but help others as well.'' 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 specifically for the latest of version 3 * http://www.mozilla.com/firefox/all-older.html : Note Mac OS X 10.4 user, and Mac OS X 10.5 users without Intel cannot upgrade to Firefox 4 or 5 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). ---- '''Keep your extensions up to date''', don't wait for a Firefox update and then try to do everything after the Firefox update. '''Research your''' extensions, some may have updates, some may be found in the developer comments or user comments on the add-on, or on the "'''View all versions'''" link which is part of the Release notes at the bottom of the add-on page. [https://addons.mozilla.org/firefox/addon/is-it-compatible/ '''Is It Compatible?''' :: Add-ons for Firefox], Are your add-ons compatible with the next version of Firefox? Find out straight from the Add-ons window! You can make Firefox 4.0.1 and '''Firefox 5.0''' look like Firefox 3.6.17, see numbered items 1-10 in the following topic [http://dmcritchie.mvps.org/firefox/firefox-problems.htm#fx4interface Fix Firefox 4.0 toolbar user interface, problems (Make Firefox 4.0 look like 3.6)]