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  Google Advanced Operations Toolbar 21 Sep 15

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  Yoono for Firefox 21 Jan 15

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

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  DuckDuckGo Plus for Firefox 21 Jan 15

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  Grammarly Lite for Firefox 22 Jan 15

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

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  Amazon S3 Firefox Organizer(S3Fox) 21 Sep 15

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  ThinkFree Viewer 21 Sep 15