title: Can my extension get a user's e-mail address from Google Chrome?
body: <p>I've got an extension for which some users contribute money or effort. I'd like to be able to identify those users by their e-mail addresses, so I can display a "Thank You!" next time they load the extension.</p>
  
  <p>Is there any way to get from Google Chrome the user's e-mail address?</p>