Depending on what changes are not being saved, either of the following links should help: * https://support.mozilla.com/kb/Preferences+are+not+saved * https://support.mozilla.com/kb/Toolbar+keeps+resetting If you have a corrupt/damaged/locked file as shown in either of those links, going back to an earlier version may not resolve your problem. ------ If you still want to go back, first uninstall Firefox 4, but do not select the option to "Remove my Firefox personal data". If you select that option it will delete your bookmarks, passwords and other user data. You can then install the latest version of Firefox 3.6 available from http://www.mozilla.com/en-US/firefox/all-older.html - it will automatically use your current bookmarks, passwords etc. To avoid possible problems with downgrading, I recommend going to your profile folder and deleting the following files if they exist - extensions.cache, extensions.rdf, extensions.ini, extensions.sqlite and localstore.rdf. Deleting these files will force Firefox to rebuild the list of installed extensions, checking their compatibility, and reset toolbar customizations. For details of how to find your profile folder see https://support.mozilla.com/kb/Profiles

Just figured out a simple solution open firefox open firefox and close the first one.