The Tor Browser / file revision

 <?xml version="1.0"?>

 <?xml-stylesheet href="chrome://global/skin/" type="text/css"?>

 <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" class="reftest-wait" onload="setTimeout(boom, 30);">

   <script>

   function boom()

   {

     var tree = document.getElementById("thetree");

     var selection = tree.view.selection;

     var treecolumn0 = tree.columns[0];

     var treecolumn1 = tree.columns[1];

     selection.select(0);

     selection.currentColumn = treecolumn0;

     tree.parentNode.removeChild(tree);

     // This is expected to throw an error (it used to crash).

     try {

       selection.currentColumn = treecolumn1;

     }

     catch (ex) {}

     document.documentElement.removeAttribute("class");

   }

   </script>

 <tree flex="1" id="thetree" seltype="cell">

     <treecols>

       <treecol label="Name"/>

       <treecol label="Test"/>

     </treecols>

     <treechildren id="TC">

       <treeitem id="TI1">

         <treerow>

           <treecell label="First treecell"/>

           <treecell label="Second treecell"/>

         </treerow>

       </treeitem>

       <treeitem id="TI2">

         <treerow>

           <treecell label="Third treecell"/>

           <treecell label="Fourth treecell"/>

         </treerow>

       </treeitem>

     </treechildren>

   </tree>

 </window>