Adding Script Dependencies for Firebase, AngularJS, and AngularFire:
Source: https://www.firebase.com/docs/web/libraries/angular/quickstart.html
<!-- AngularJS --> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script> <!-- Firebase --> <script src="https://cdn.firebase.com/js/client/2.2.4/firebase.js"></script> <!-- AngularFire --> <script src="https://cdn.firebase.com/libs/angularfire/1.2.0/angularfire.min.js"></script>