The Tor Browser / file revision

 <?xml version="1.0" encoding="UTF-8"?>

 <?xml-stylesheet type="text/css" href="data:text/css,

 window { direction: rtl; }

 tree { height: 100px; }

 treecol, treecolpicker { visibility: hidden; }

 treechildren::-moz-tree-cell { direction: ltr; }

 "?>

 <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>