title: Firefox grey box on when clicking links
body: <p>I am unable to remove the grey box behind a link when it is clicked in Firefox.</p>
  
  <p>I have tried using the code below which was recommended in a few different cases but it was unsuccessful.</p>
  
  <pre><code>a:active {
  background-color: transparent !important;
  }
  </code></pre>
  
  <p>Here is a photo of what is happening when clicking a link:</p>
  
  <p><img src="https://i.stack.imgur.com/mJcGY.png" alt="enter image description here"></p>