title: Shaking/moving/trembling background-image in Mozilla
body: <p>I have a problem with background image on my website in Mozilla and I am depressed because I do not know how to solve it ... The problem is kindly strange, please look :</p>
  
  <p><a href="http://www.rask.pl/test/jopillo/dziesiec-filmow-ktorych-nie-moz-65.html" rel="nofollow">MY WEBSITE</a> (please look in Mozilla)</p>
  
  <p>Background of main photo is shaking/moving/trembling... After click on thumb below - it's stabilized.</p>
  
  <p>Backgrounds of images are taking from 'onclick' but I don't think it's important. Of course:</p>
  
  <pre><code>background-size:cover;
  background-repeat:no-repeat;
  background-position:center center;
  </code></pre>
  
  <p>Any clue? I would be glad for any kind of help... :)</p>