The Firefox 3.5.x branch has reached end-of-life and is no longer maintained.<br /> You will no longer receive security updates.<br /> You can update Firefox via "Help > Check for Updates" or download and install the latest Firefox 3.6.x or 4.0.x version.<br /> <br /> ---- Download a new copy of the Firefox program and save the DMG file to the desktop * Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html * Firefox 3.6.x: http://www.mozilla.com/en-US/firefox/all-older.html * Trash the current Firefox application to do a clean (re-)install * Install the new version that you have downloaded Your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder], so you won't lose your bookmarks and other personal data.