The Tor Browser / file revision

 <?xml version="1.0"?>

 <?xml-stylesheet type="text/xml" href="#bug"?>

 <!DOCTYPE doc [

 <!ATTLIST xsl:transform

   id	ID	#REQUIRED>

 ]>

 <doc>

   <xsl:transform 

     xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

     xmlns:exslstrings="http://exslt.org/strings"

     version="2.0"

     id="bug">

     <xsl:variable name="v0" select="$v0" /> 

     <xsl:template name="t2" match="/">

       <xsl:param name="p0" select="exslstrings:tokenize('1234','foobar')" />

       <xsl:copy-of select="round($v0)" /> 

     </xsl:template>

   </xsl:transform>

 </doc>