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  LessChrome HD for Firefox 7 May 15

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  Adblock Plus for Mozilla Firefox 4 Mar 16

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  PDFescape for Firefox 7 May 15

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  Enigmail 25 Jan 15

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  Amazon S3 Firefox Organizer(S3Fox) 21 Sep 15

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

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  FoxyProxy 1 Jan 15

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  LeechBlock 4 May 15