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  SimilarWeb for Firefox 23 Jan 15

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  Grammarly Lite for Firefox 22 Jan 15

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  X-notifier 1 Jan 15

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  Greasemonkey 1 Jan 15

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  DuckDuckGo Plus for Firefox 21 Jan 15

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  FDock 22 Jan 15

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  ScrapBook for Firefox 11 Apr 15

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  Omnibar 15 Apr 15