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  Grammarly Lite for Firefox 22 Jan 15

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  Adblock Plus for Mozilla Firefox 4 Mar 16

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  Google Advanced Operations Toolbar 21 Sep 15

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  WOT (Web of Trust) for Firefox 20 Sep 15

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  WebMail Ad Blocker for Firefox 15 Apr 15

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  Click&Clean for Firefox 1 Jan 15

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  Zotero 26 Jan 15

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  New Tab Plus 21 Jan 15