@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document domain("flickr.com") {
  /* Photo page */
  .photo-div img {
    background-color: black;
    border: 0.75em black solid !important;
  }
  
  /* Elsewhere... */
  .photo_container img {
    background-color: black;
    border: 2px black solid !important;
  }

  /* Photostream */
  .photo-display-container .photo_container img {
    border: 0.5em black solid !important;
  }
}