The Tor Browser / file revision

 <?xml version="1.0"?>

 <window

   id="sliderprint" title="Print These Sliders"

   xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"

   style="background-color: white">

   <label>

   With the Classic theme, printing causes the browser to crash. adding style="-moz-appearance: none" to the

   thumb prevents the crash. The crash doesn't happen at all with Modern.

   </label>

   <spacer height="10"/>

     <hbox>

         <slider style="height: 174px; width: 24px" orient="vertical">

             <thumb/>

         </slider>

     </hbox>

 </window>