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http://filext.com/detaillist.php?extdetail=xpi

These are the public entries for this link:

• Filext
  
  Details for file extension: XPI - Mozilla/Firefox Browser Extension Archive (Mozilla) - This is basically a ZIP file that, when opened by the browser utility, installs a browser extension. This extension applies to both Mozilla and Firefox browsers.
  extension extensions file xpi
  By cherryzinha in Public bookmarks with system:unfiled

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