If you really want to go back, see * https://support.mozilla.com/en-US/questions/839986 You might want to check about "McAfee Site Advisor" in problematic extensions, it has been a source of problems since Firefox 3.6, it was a very important extension and I like the methods (actually better before they added people comments to the mix) but I can't use it and "WOT" extension is a bad substitute as it is just opinions and not real checking. * http://kb.mozillazine.org/Problematic_extensions * https://support.mozilla.com/en-US/questions/837419 * [http://www.google.com/search?num=100&hl=en&newwindow=1&complete=0&as_qdr=all&ie=ISO-8859-1&q=inurl%3Aquestions++site%3Amozilla.com+-%22page%3D%22+-%22filter%3D%22+site+advisor&btnG=Search Questions here that mention Site Advisor] ---- Look for some changes to Site Advisor in 3rd week Jul 2011 (posted by Hayton) * https://support.mozilla.com/en-US/questions/837419 * https://community.mcafee.com/message/195191#195191