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  Lightbeam 1 Jan 15

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  DuckDuckGo Plus for Firefox 21 Jan 15

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  Modify Headers 5 May 15

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  FastestFox 21 Jan 15

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  WOT (Web of Trust) for Firefox 20 Sep 15

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  Adblock Plus for Mozilla Firefox 4 Mar 16

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  MM3-ProxySwitch 17 Jun 17

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  Session Manager 1 Jan 15