title: Button:hover not working in Firefox
body: <p>I haveing the problem that the hover is not working in Firefox! It is working in Chrome, IE 9, IE 8 and IE 7. Does somewone know this problem and how to fix it?<br/></p>
  
  <p><strong>The CSS</strong>:<br/>
  <code>.row button span:hover {
      background-position : left bottom;
      border : 1px solid #2b2b2b;
  }</code></p>
  
  <p><strong>The HTML</strong>:<br />
  <code>&lt;button type="submit"&gt;&lt;span&gt;Button&lt;/span&gt;&lt;/button&gt;</code></p>