I created this follow-along demo for my User Authentication Made Easy with Firebase tutorial. It's written in Ember and uses the EmberFire and Torii addons for authenticating via the Firebase service. It also makes use of the Bootstrap and Font Awesome addons to make it more visually appealing.
The app allows the user to sign up, sign in, and sign out. When they are authenticated, users can see the Welcome page that displays their user information. The app demonstrates action-based redirection (eg. When the user signs in, they are taken the the Welcome page) and authentication-based redirections (eg. If the user is not authenticated, they are redirected from the Welcome page to the Home page). The app specifically lacks input validation and proper error handling, as those items were out of the scope of the tutorial and left up to the reader to implement.