McAfee script blocking - Just because SiteAdvisor, TrendProtect, Norton Confidential, or whatever web rating tool you use returns a green rating to indicate a site's 'trustworthiness;' don't assume it also means that you are safe from infection. McAfee SecurityCenter addresses the iFrame problem with script blocking, letting you know that JavaScript is trying to execute on your system unbeknownst to you, and allowing you to stop it dead in its tracks.