It is best to use 3.6 rather than 3.0, version3.0 is not supported. To downgrade to Firefox 3.6 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 ----- An alternative approach is to keep Firefox 4 and install the portable version of Firefox 3.6 on your hard drive. The portable version will be totally independent of the main version and can be used when you want to access that site. You can get it from http://portableapps.com/apps/internet/firefox_portable