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  SimilarWeb for Firefox 23 Jan 15

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  AnonymoX 5 Nov 14

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  iMacros for Firefox 23 Jan 15

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  Mozilla Lightning 25 Jan 15

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  WebMail Ad Blocker for Firefox 15 Apr 15

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  WOT (Web of Trust) for Firefox 20 Sep 15

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  SEO Toolbar by Moz 31 Dec 14

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  About:addons-memory for Firefox 25 Jan 15