title: What is the best to identify machine/user in Google Chrome Extention?
body: <p>I have a web app and complementing chrome extension for it, which sends data in background to the web app. Now, I want to send this data to the corresponding user account in the web app. What method should I use? How should I handle the authentication?</p>
  
  <p>I was thinking if there was some way to identify machine ID or something which I can register while user is signing up, but I cannot see any method to get machine ID.</p>
  
  <p>Please suggest a best way to implement this.</p>
  
  <p>Thanks!</p>