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unable to remove popup using preferences/content. how can this be resolved

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I have a popup that appears when I open firefox page/ new window. The popup is blocked in the preferences/content folder. Unable to remove popup.

I have a popup that appears when I open firefox page/ new window. The popup is blocked in the preferences/content folder. Unable to remove popup.

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I would suggest that you install "Adblock Plus" extension with the "EasyList US" filter subscription installed after installing ADP. If the pop-up is is not blocked you block it yourself with your own filter.