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  Mozilla Lightning 25 Jan 15

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  Active Whois Plugin for Firefox 7 Apr 16

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  Omnibar 15 Apr 15

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  Easy Screen Shot 21 Jan 15

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  BlogEverywhere Blogbar for FireFox 1.5+ 23 Sep 15

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

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

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  Telify 27 Jan 15