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  SimilarWeb for Firefox 23 Jan 15

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  WOT (Web of Trust) for Firefox 20 Sep 15

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  Rikaisama 23 Jan 15

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  Firebug 1 Jan 15

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  Tamper Data 9 Jul 15

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  CoolPreviews for Firefox 11 Apr 15

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  Annotary 21 Jan 15

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  iMacros for Firefox 23 Jan 15