gecko/browser/components/places/content/places.css

tree[type="places"] {
  -moz-binding: url("chrome://browser/content/places/tree.xml#places-tree");
}

hbox[type="places"] {
  -moz-binding: url("chrome://browser/content/places/toolbar.xml#places-bar");
  overflow: hidden;
}

.bookmarks-toolbar-customize,
toolbarpaletteitem .bookmarks-toolbar-items {
  display: none;
}

toolbarpaletteitem .bookmarks-toolbar-customize {
  display: -moz-box;
}

menupopup[type="places"] {
  -moz-binding: url("chrome://browser/content/places/menu.xml#places-menupopup");
}

menupopup[placespopup="true"] {
  -moz-binding: url("chrome://browser/content/places/menu.xml#places-popup-base");
}