You can't update to Firefox 3 or later versions if you have Mac OS X 10.3.9.<br /> Firefox 2.0.0.20 is that latest version available for your Mac OS X version. Mac: https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/ See also: * http://kb.mozillazine.org/Unsupported_operating_systems ---- Your above posted system details show two old Flash plugins # Shockwave Flash 9.0 r47 # Shockwave Flash 9.0 r16 You should at least update to the latest Flash 9 version available and remove those two old versions.<br /> Flash Player 9: http://www.adobe.com/go/kb406791