title: Some icons (not all) are not showing on Firefox
body: <p>For some reasons that I can't understand, some icons are not showing in Mozilla Firefox.. 
  Other browsers like Safari (Osx and ios), Chrome and Opera are showing all icons.</p>
  
  <p>Problem page on my site is - <a href="http://lightmuzikmastering.ru/order/" rel="nofollow">http://lightmuzikmastering.ru/order/</a></p>
  
  <p>Just try this simple working code and you'll see a wrong icon in Mozilla...</p>
  
  <pre><code>    &lt;!DOCTYPE html&gt;
  &lt;html&gt;
   &lt;head&gt;
    &lt;meta charset="utf-8"&gt;
  &lt;link rel="stylesheet" href="http://lightmuzikmastering.ru/font-awesome/css/font-awesome.min.css"&gt;
   &lt;/head&gt; 
   &lt;body&gt;
  &lt;i class="fa fa-vk"&gt;&lt;/i&gt;
   &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>