meyerweb

@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document domain("twitter.com") {
  /* styles for collapsing media in tweets and showing an arrow to indicate their existence
     but only at the top level */
  ol.stream-items > .expanding-stream-item:not(.open) .OldMedia,
  ol.stream-items > .expanding-stream-item:not(.open) .AdaptiveMedia {
    display: none;
  }