@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

tab[busy] {
  list-style-image: url("chrome://global/skin/loading.gif");
}

.tabbrowser-closebox {
  list-style-image: url("chrome://global/skin/closebox.gif");
  margin-bottom: 3px;
  margin-right: 2px;
}