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  HTTPS Everywhere for Firefox 11 May 16

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  HTTP Header 16 Apr 15

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  WOT (Web of Trust) for Firefox 20 Sep 15

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  FireSSH 21 Jan 15

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  Ecosia 31 Dec 14

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  Tamper Data 9 Jul 15

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  Web Developer for Firefox 1 Jan 15

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  SimilarWeb for Firefox 23 Jan 15