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  SimilarWeb for Firefox 23 Jan 15

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  Tab Mix Plus 23 Jan 15

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  AnonymoX 5 Nov 14

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

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  CoolPreviews for Firefox 11 Apr 15

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  Adblock Plus for Mozilla Firefox 4 Mar 16

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  SearchPreview 1 Jan 15

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  Session Manager 1 Jan 15