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  YouTube Control Center 30 Dec 14

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  Active Whois Plugin for Firefox 7 Apr 16

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  WOT (Web of Trust) for Firefox 20 Sep 15

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  SimilarWeb for Firefox 23 Jan 15

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  Adblock Plus for Mozilla Firefox 4 Mar 16

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  Telify 27 Jan 15

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  Simple Adblock 16 Apr 15

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  ScrapBook for Firefox 11 Apr 15