title: Uncaught ReferenceError: Firebase is not defined
body: <p>I am trying to follow the tutorial on designing a database in firebase, but I am getting the following error in the JavaScript console:</p>
  
  <blockquote>
    <p>Uncaught ReferenceError: Firebase is not defined</p>
  </blockquote>
  
  <p>Here is the link to the tutorial, and the code snippet that I was trying to run in the JavaScript console is: <a href="https://www.firebase.com/blog/2014-11-04-firebase-realtime-queries.html">https://www.firebase.com/blog/2014-11-04-firebase-realtime-queries.html</a></p>
  
  <pre><code>var ref = new Firebase("https://dinosaur-facts.firebaseio.com/dinosaurs");
  ref.orderByChild("height").on("child_added", function(snapshot) {
    console.log(snapshot.key() + " was " + snapshot.val().height + " meters tall");
  });
  </code></pre>