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

@-moz-document
  url(chrome://browser/content/bookmarks/bookmarksPanel.xul),
  url(chrome://browser/content/history/history-panel.xul) {

  treechildren::-moz-tree-twisty {
  -moz-appearance: none !important;
  padding-right: 0px !important;
  padding-top: 0px !important;
  width: 0px !important;
  list-style-image: none !important; }
}