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  WOT (Web of Trust) for Firefox 20 Sep 15

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  ZenMate VPN for Firefox 15 Aug 18

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  Easy Screen Shot 21 Jan 15

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  FoxyProxy Basic 22 Jan 15

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  Googlebar Lite 26 Jan 15

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  Ghostery (for Firefox) 14 Feb 15

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  SimilarWeb for Firefox 23 Jan 15

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