You can uninstall Firefox 4 by running the Firefox uninstaller - https://support.mozilla.com/kb/Uninstalling+Firefox If reverting to an earlier version of Firefox, when uninstalling Firefox 4 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 Firefox 3.6.15 available from http://www.mozilla.com - 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