Mozilla is advising Firefox users to disable or uninstall the McAfee ScriptScan plugin that causes stability or security problems.
"Users are strongly encouraged to disable the problematic add-on or plugin, but may choose to continue using it if they accept the risks described," the notice states"When Mozilla becomes aware of add-ons, plugins, or other third-party software that seriously compromises Firefox security, stability, or performance and meets certain criteria, the software may be blocked from general use. For more information, please read this support article," it explains.The problem, however, appears to be restricted to Firefox only. Users are advised by Mozilla to disable the plugin; however, Intel's Security Division (Intel now owns McAfee) are working with Mozilla on rectifying the issue.ScriptScan is a component that comes bundled with McAfee's VirusScan security software. The technology is designed to scan websites for hostile code. Unfortunately ScriptScan does not play well with Firefox. Versions 14.4.0 and below reportedly cause all versions of Firefox, even the latest 7.x release, to crash.
Read more: http://www.theregister.co.uk/2011/10/05/moz_mcafee_security_plugin_crash_warning/