gistfile1.js

<script type="text/javascript" src="https://cdn.firebase.com/js/client/1.0.17/firebase.js"></script>
<script type="text/javascript" src="https://cdn.firebase.com/js/simple-login/1.6.1/firebase-simple-login.js"></script>
<script type="text/javascript">
	var firebase = new Firebase('https://<YOUR-FIREBASE>.firebaseio.com');
	var auth = new FirebaseSimpleLogin(firebase, function(error, user) {
		if(error) {
			console.log('Firebase Login Error: ', error);
		} else if(user) { 
			console.log('Firebase Login Success: ', user);
		} else { 
			console.log('Firebase Logged Out');
		}
	});
</script>