what else am i supposed to do?

i'm trying to use priceAdvance w/ firefox 2.0.0.17 . i have turned OFF the option to block pop-up windows. i can see that Priceadvance has been successfully installed by looking at Tools and then Add-ons, wherein it appears as an enabled extension. I go to Sears and search for "sharp 46-in lcd hdtv" and sears has them, and i click on the price, and losts of other things, but no PriceAdvance overlay window ever appears within my main firefox browser window. what else should i do?
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