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I have set the Firefox to block pop-ups, but I still receive annoying popups when visiting websites.

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I go to Option > Content, and then tick the box "Block pop-up windows", but I still receive popups when I visit websites like kojaxx.com and bookmarkitnow.com. Why?

I go to Option > Content, and then tick the box "Block pop-up windows", but I still receive popups when I visit websites like kojaxx.com and bookmarkitnow.com. Why?

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