I don't trust anything Yahoo does anymore. Not since I joined up for their discussion forums last year and started getting spam the very next day. They will state one thing but say another. Gee, I wonder if there's Spyware in that pop-up blocker. Hence, my apprehension pertaining to anything Yahoo......or as I call them, Yahooligans! The best pop-up stopper I've used is Pop-Up Stopper Pro.