www.royalgorgeroute.com is an example of certain sites that require this upgrade after security update 001 or 002 is run. It and/or the one for Macromedia Flash Player prevent "unexpected quit" for FoxFire and Safari. No problems were noted for this update with Safari. Update may NOT be needed for all sites nor may it be needed if Apple security updates 001 and 002 for 2006 have no been run.