What does it say in IE lower right corner about Protected mode when you load a website? On or Off? Because if you have turned off UAC (User Account Control) then Protected mode in IE goes off aswell what may result in pop-up blocker to stop working
I guess firefox must have it's own pop-up blocker and it won't use IE's one. Try to enable UAC, enable Protected mode in Internet settings and load that page with IE. If no pop-ups appear then it's probably firefox not being able to block them. Most likely you will have to reconfigure your browser or download an add-on for blocking pop-ups
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