palemoon-dev/platform/layout/xul/tree/crashtests/454186-1.xul

<?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">

<tree flex="1">
  <treecols>
    <treecol label="test" flex="1" type="progressmeter" />
  </treecols>
  <treechildren>
    <treeitem>
      <treerow>
        <treecell value="50" mode="normal" />
      </treerow>
    </treeitem>
    <treeitem>
      <treerow>
        <treecell mode="undetermined" />
      </treerow>
    </treeitem>
  </treechildren>
</tree>

</window>