@namespace url(http://www.w3.org/1999/xhtml);
/*
 * Show image placeholders
 */
@-moz-document url-prefix(http), url-prefix(https), url-prefix(file) {
  img:-moz-broken{
    -moz-force-broken-image-icon:1;
    width:24px;
    height:24px;
  }
}