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  Add-on Builder 7 May 15

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  DuckDuckGo Plus for Firefox 21 Jan 15

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  Cliqz 20 Jan 15

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  IE Tab for Firefox 1 Jan 15

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  Active Whois Plugin for Firefox 7 Apr 16

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  Media Hint 11 Apr 18

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  FastestFox 21 Jan 15

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  Awesome Screenshot for Firefox 11 Apr 15