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  DownThemAll 1 Jan 15

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  HTTP Header 16 Apr 15

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  DuckDuckGo Plus for Firefox 21 Jan 15

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  Re-Pagination 15 Apr 15

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  SimilarWeb for Firefox 23 Jan 15

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  AutoPager 26 Jan 15

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  Ghostery (for Firefox) 14 Feb 15

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  WOT (Web of Trust) for Firefox 20 Sep 15