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  Grammarly Lite for Firefox 22 Jan 15

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  Adblock Plus for Mozilla Firefox 4 Mar 16

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  AdF.ly Skipper 25 Jan 15

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  Web Developer for Firefox 1 Jan 15

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

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  Add-on Builder 7 May 15

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  IE Tab for Firefox 1 Jan 15

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  SearchPreview 1 Jan 15