Very interesting!!! I was getting the pop-ups on every new page or refresh. After disabling Link Extender, I have not gotten another pop-up for a couple of hours now... Looks like the culprit has been found and neutralized. In checking LinkExtend's site, I found that the most recent upgrade was to 1.0.7 on 12/24/2009 - about the time that I started getting the pop-ups. Also, their Future Development plans include "Blocking dangerous sites and/or showing onscreen warnings". Perhaps when they provide another update, I will try it again. Thanks WartEye!!!