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My pop up blocker is not working properly, how can I fix this?

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I have windows XP O/S I've had to reinstall firefox a number of times this week, because i couldn't open it from my desk top. Now I have it installed, almost every time I open a web page an unwanted pages starts running opens and than freezes everything else

This happened

Every time Firefox opened

== about a weeke ago

I have windows XP O/S I've had to reinstall firefox a number of times this week, because i couldn't open it from my desk top. Now I have it installed, almost every time I open a web page an unwanted pages starts running opens and than freezes everything else == This happened == Every time Firefox opened == about a weeke ago

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