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  Grammarly Lite for Firefox 22 Jan 15

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  Session Manager 1 Jan 15

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  BlogEverywhere Blogbar for FireFox 1.5+ 23 Sep 15

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  Wappalyzer 15 Apr 15

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

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  Mozilla Archive Format 22 Jan 15

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  New Tab Plus 21 Jan 15

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  FireFTP 1 Jan 15