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  AdF.ly Skipper 25 Jan 15

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  DuckDuckGo Plus for Firefox 21 Jan 15

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  DownThemAll 1 Jan 15

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  Zotero 26 Jan 15

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  FireFTP 1 Jan 15

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  WOT (Web of Trust) for Firefox 20 Sep 15

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  HTML Validator (based on CSE HTML Validator) 21 Sep 15

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  Console 21 Sep 15