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  DuckDuckGo Plus for Firefox 21 Jan 15

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  WOT (Web of Trust) for Firefox 20 Sep 15

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  Media Hint 11 Apr 18

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  HTTP Header 16 Apr 15

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  Active Whois Plugin for Firefox 7 Apr 16

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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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  HTTPS Everywhere for Firefox 11 May 16