title: Debugging a Firebase Client Connection
body: <p>We have a user reporting that their data isn't loading in our app and we're having trouble debugging why this is happening.</p>
  
  <p>We're currently screen sharing with this user and it turns out that a call like this never returns:</p>
  
  <p><code>new Firebase("http://gamma.firebase.com/path/to/our/data").once('value', function(r) { console.log(r); });</code></p>
  
  <p>Yet this works fine from other clients.</p>
  
  <p>I don't even know how we would go about debugging this. How would we determine why the callback isn't firing?</p>