title: md-sidenav overflow not working
body: <p>This is a Firefox issue, Chrome works fine.</p>
  
  <p>Sidenav its not "overflowing" the content</p>
  
  <p>To see in action, just visit the link below using Firefox, to get it right, use Chrome.</p>
  
  <p><a href="http://codepen.io/anon/pen/JdJRez" rel="nofollow">Angular Material Demo  v0.9.8</a></p>
  
  <p>There is no much to say.</p>
  
  <p>Any tips?</p>
  
  <pre><code>&lt;div layout="row" flex&gt;
     &lt;md-sidenav layout="column" class="md-sidenav-left md-whiteframe-z2" md-component-id="left" md-is-locked-open="$mdMedia('gt-sm')"&gt;
        &lt;h1&gt;Test&lt;/h1&gt;
        ....
        ....  // overflow content
     &lt;/md-sidenav&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>What i notice its a overflow blinks when page load.</p>