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  Omnibar 15 Apr 15

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  Firebug 1 Jan 15

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  Optimal Access 7 Apr 16

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  Google Advanced Operations Toolbar 21 Sep 15

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  Ghostery (for Firefox) 14 Feb 15

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  DictionarySearch 27 Apr 18

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  iMacros for Firefox 23 Jan 15

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  Twitter App 22 Jan 15