I’m frustrated

How do I stop constant pop-ups in Mozilla Firefox browser? (wrong forum)

Prior to a recent reinstall of Windows XP, I never had a pop-up issue with Mozilla Firefox browser. Now they are constant and many times cover up information on the page I am looking at and some even have no X to close out of. Any assistance would be greatly appreciated. Heads up: am a novice so step by step instructions would be beneficial.
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