Mcafee Site Advisor has stopped working on Firefox. It works on Internet Explorer. I prefer Firefox and want to keep using it! It is marked as enabled in the Add Ons in the top right Menu. I have tried reloading Firefox. I have tried disabling Site Advisor and re-enabling it. I have contacted McAfee who say it is not a software fault of theirs. I have a new Lesovo PC with Windows 8.1. Site advisor ran for a few days then this problem occurred. thankyou