Firefox 3.0 and 3.5/6 versions require at least Mac OS X 10.4 *http://www.mozilla.com/en-US/firefox/system-requirements.html - Mozilla Firefox 3.6 System Requirements Firefox 2.0.0.20 is the last release that runs on Mac OS X 10.2 and 10.3 See: * http://kb.mozillazine.org/Installing_Firefox * http://kb.mozillazine.org/Unsupported_operating_systems Mac: https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/ ---- If you have Mac OS X 10.4 or newer then do this: * Download a new copy of the Firefox program: http://www.mozilla.com/firefox/all.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. ---- Other things that need attention.<br> Your above posted system details show two old Flash 9 plugins that you should remove and update to the latest Flash 9 version. text # Shockwave Flash 9.0 r47 # Shockwave Flash 9.0 r16 Flash Player 9: http://www.adobe.com/go/kb406791 (Flash Player 9 for Unsupported Operating Systems)