title: Clickable tel protocol a tag in firefox
body: <p>I have a pretty standard a tag for a telephone number. It works in everything <strong>except</strong> Firefox. I thought the tel protocol was standard - is there a workaround I am unaware of?</p>
  
  <pre><code>&lt;a class="tel" href="tel:8001234567"&gt;(800) 123-4567&lt;/a&gt;
  </code></pre>
  
  <p>Firefox error message:</p>
  
  <blockquote>
    <p>The address wasn't understood     </p>
    
    <p>Firefox doesn't know how to open this address, because the protocol (tel) isn't associated with any program.    </p>
    
    <p>You might need to install other software to open this address.</p>
  </blockquote>