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  CoolPreviews for Firefox 11 Apr 15

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  Click&Clean for Firefox 1 Jan 15

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  Ecosia 31 Dec 14

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  Macbirdblue 21 Sep 15

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  Ghostery (for Firefox) 14 Feb 15

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  DictionarySearch 27 Apr 18

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  HTTP Header 16 Apr 15

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  DuckDuckGo Plus for Firefox 21 Jan 15