@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);
treechildren#styles-children::-moz-tree-row(even) {
  background:#efefff;
  color:#000000;
}

treechildren#styles-children::-moz-tree-row(odd) {
  background-color: #feffff;
  color:#000000;
}