Changes

The Worker may optionally provide a "Contacts" API, which responds to events delivered from the browser to the Worker. This allows the browser to retrieve a list of contact data, including names, photos, service endpoints, and more, which can be made available through the WebContacts API to user-approved content. By using this API to access multiple social services, trusted web applications can create "person-centric" advanced contact management systems and social applications. (For more, see [https://bugzilla.mozilla.org/show_bug.cgi?id=674720 bug 674720]).