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  Web Developer for Firefox 1 Jan 15

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

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  Cliqz 20 Jan 15

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  Easy Screen Shot 21 Jan 15

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  Active Whois Plugin for Firefox 7 Apr 16

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  FoxFilter 4 May 15

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  Modify Headers 5 May 15

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  FastestFox 21 Jan 15