Congratulations! We have now our web app with an app icon, manifest, and service worker, which means our PWA can be installed, it works offline, and it supports push notifications. Now we need to share our app with the world. To do this, we need to send it to a web server with an SSL (a requirement for PWAs). Fortunately, Firebase Hosting can help us do this. In this chapter, we add a basic authentication system that allows users to have their accounts, thanks to the power of Firebase authentication.