Implementing email/password authentication

In this recipe, we're going to demonstrate how we can implement password authentication from a really simple, widespread example scenario that is present in many different web applications. The following is a screenshot of the Firebase application supporting email/password authentication:

Figure 1: Basic application supporting email/password authentication

How to do it...

1. In the previous figure, we saw a simple login page with Email and Password fields and another button for anonymous login. First, let's see the code behind it:

      <div class="container">
        <div class="jumbotron">
          <div class="text-center&quot...