title: Drag and drop in XUL
body: <p>How can I allow drag and drop on the listbox items to rearrange the items in XUL? I'm doing this in a firefox addon. I've tried <code>draggable="true"</code> in the listbox tag but that doesn't seem to have worked. Could you provide some example XUL listbox code where drag and drop would work?</p>
  
  <p>Thanks.</p>