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  LeechBlock 4 May 15

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  iMacros for Firefox 23 Jan 15

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  PhProxy-InBasic 21 Sep 15

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  Wappalyzer 15 Apr 15

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  Simple Adblock 16 Apr 15

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  Adblock Plus for Mozilla Firefox 4 Mar 16

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

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  DownThemAll 1 Jan 15