<?xml version="1.0" encoding="UTF-8"?> <?xml-stylesheet type="text/css" href="data:text/css, tree { height: 100px; -moz-appearance: none; border: none; background-color: transparent; } treecol, treecolpicker { visibility: hidden; } treechildren::-moz-tree-cell-text { opacity: 0; } "?> <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <tree> <treecols> <treecol flex="1"/> </treecols> <treechildren> <treeitem> <treerow> <treecell label="test"/> </treerow> </treeitem> </treechildren> </tree> </window>