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How to turn off AddThis feature?

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AddThis pops in on some of the pages I read. It is of no use to me and would like to permanently turn it off. Is there some way to do this?

AddThis pops in on some of the pages I read. It is of no use to me and would like to permanently turn it off. Is there some way to do this?

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It looks like this is an extension that got installed on your copy of Firefox. The instructions in Disable or remove Add-ons explain how to remove it.