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how do i get rid of a pop-up that appears when I exit Firefox

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  • 1 has this problem
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  • Last reply by cor-el

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Every time I exit firefox, a pop-up from this 1 website my son visited keeps popping up. I have tried deleting cookies but it didn't work.

Every time I exit firefox, a pop-up from this 1 website my son visited keeps popping up. I have tried deleting cookies but it didn't work.

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What does that pop-up say?