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 Passwordfields and another button for anonymous login. First, let's see the code behind it:

      <div class="container">
        <div class="jumbotron">
          <div class="text-center">
             <img src="img/firebase.png">
      <p style="margin-top:-50px">Log in using your        
       favorite method</p>
          </div>
          <form class="form-inline text-center">
             <div class="form-group">
               <label class="sr-only" for...