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  Hola Unblocker for Firefox 1 Jan 15

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  FireShot for Firefox: Capture + Annotate Webpage Screenshots 26 Jan 15

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  DuckDuckGo Plus for Firefox 21 Jan 15

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  iMacros for Firefox 23 Jan 15

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  HTML Validator (based on CSE HTML Validator) 21 Sep 15

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  Omnibar 15 Apr 15

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  DownThemAll 1 Jan 15

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  Cliqz 20 Jan 15