QuoteThe SiteAdvisor add-on for Firefox evaluates search results to let you know how safe a site is to visit before you go there, but one Mozilla engineer says that it drags down Firefox and causes huge memory leaks.
It's just the kind of problem that Mozilla doesn't want to be dealing with as it finds itself knee-deep in an ambitious development plan and surrounded by ever-tougher competition.
Mozilla engineer Nicholas Nethercote wrote a blog post early today in which he recommended that Firefox users disable the add-on immediately. He also wrote that Mozilla ought to actively block it until Intel, McAfee's owner, fixes the problem.
More at Mozilla contemplates nuking McAfee | The Download Blog - Download.com (http://download.cnet.com/8301-2007_4-57380433-12/mozilla-contemplates-nuking-mcafee/)
It appears that McAfee has fixed the problem with Site Advisor so if you had disabled it, check for an update.