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/usr/share/xul-ext/websites-integration/chrome.manifest is in xul-ext-websites-integration 2.3.6+13.10.20130920.1-0ubuntu1.

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interfaces components/uwIGreasemonkeyService.xpt

component  {2a0b5340-2714-11e1-bfc2-0800200c9a66} components/unity_webapps.js
contract   @unity_webapps.mozdev.org/unity_webapps-service;1 {2a0b5340-2714-11e1-bfc2-0800200c9a66}
category   profile-after-change @unity_webapps.mozdev.org/unity_webapps-service;1 @unity_webapps.mozdev.org/unity_webapps-service;1

content unity_webapps jar:chrome/unity_webapps.jar!/content/

overlay	   chrome://browser/content/browser.xul chrome://unity_webapps/content/browser.xul

resource   unity_webapps modules/