diff -r 000000000000 -r 6474c204b198 content/xml/document/resources/XMLPrettyPrint.xsl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/xml/document/resources/XMLPrettyPrint.xsl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,137 @@
+<?xml version="1.0"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<!DOCTYPE overlay [
+  <!ENTITY % prettyPrintDTD SYSTEM "chrome://global/locale/xml/prettyprint.dtd">
+  %prettyPrintDTD;
+  <!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd">
+  %globalDTD;
+]>
+
+<xsl:stylesheet version="1.0"
+                xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+                xmlns="http://www.w3.org/1999/xhtml">
+
+  <xsl:output method="xml"/>
+
+  <xsl:template match="/">
+    <link href="chrome://global/content/xml/XMLPrettyPrint.css" type="text/css" rel="stylesheet"/>
+    <link title="Monospace" href="chrome://global/content/xml/XMLMonoPrint.css" type="text/css" rel="alternate stylesheet"/>
+    <div id="header" dir="&locale.dir;">
+      <p>
+        &xml.nostylesheet;
+      </p>
+    </div>
+    <xsl:apply-templates/>
+  </xsl:template>
+
+  <xsl:template match="*">
+    <div>
+      <xsl:text>&lt;</xsl:text>
+      <span class="start-tag"><xsl:value-of select="name(.)"/></span>
+      <xsl:apply-templates select="@*"/>
+      <xsl:text>/&gt;</xsl:text>
+    </div>
+  </xsl:template>
+
+  <xsl:template match="*[node()]">
+    <div>
+      <xsl:text>&lt;</xsl:text>
+      <span class="start-tag"><xsl:value-of select="name(.)"/></span>
+      <xsl:apply-templates select="@*"/>
+      <xsl:text>&gt;</xsl:text>
+
+      <span class="text"><xsl:value-of select="."/></span>
+
+      <xsl:text>&lt;/</xsl:text>
+      <span class="end-tag"><xsl:value-of select="name(.)"/></span>
+      <xsl:text>&gt;</xsl:text>
+    </div>
+  </xsl:template>
+
+  <xsl:template match="*[* or processing-instruction() or comment() or string-length(.) &gt; 50]">
+    <div class="expander-open">
+      <xsl:call-template name="expander"/>
+
+      <xsl:text>&lt;</xsl:text>
+      <span class="start-tag"><xsl:value-of select="name(.)"/></span>
+      <xsl:apply-templates select="@*"/>
+      <xsl:text>&gt;</xsl:text>
+
+      <div class="expander-content"><xsl:apply-templates/></div>
+
+      <xsl:text>&lt;/</xsl:text>
+      <span class="end-tag"><xsl:value-of select="name(.)"/></span>
+      <xsl:text>&gt;</xsl:text>
+    </div>
+  </xsl:template>
+
+  <xsl:template match="@*">
+    <xsl:text> </xsl:text>
+    <span class="attribute-name"><xsl:value-of select="name(.)"/></span>
+    <xsl:text>=</xsl:text>
+    <span class="attribute-value">"<xsl:value-of select="."/>"</span>
+  </xsl:template>
+
+  <xsl:template match="text()">
+    <xsl:if test="normalize-space(.)">
+      <xsl:value-of select="."/>
+    </xsl:if>
+  </xsl:template>
+
+  <xsl:template match="processing-instruction()">
+    <div class="pi">
+      <xsl:text>&lt;?</xsl:text>
+      <xsl:value-of select="name(.)"/>
+      <xsl:text> </xsl:text>
+      <xsl:value-of select="."/>
+      <xsl:text>?&gt;</xsl:text>
+    </div>
+  </xsl:template>
+
+  <xsl:template match="processing-instruction()[string-length(.) &gt; 50]">
+    <div class="expander-open">
+      <xsl:call-template name="expander"/>
+
+      <span class="pi">
+        <xsl:text> &lt;?</xsl:text>
+        <xsl:value-of select="name(.)"/>
+      </span>
+      <div class="expander-content pi"><xsl:value-of select="."/></div>
+      <span class="pi">
+        <xsl:text>?&gt;</xsl:text>
+      </span>
+    </div>
+  </xsl:template>
+
+  <xsl:template match="comment()">
+    <div class="comment">
+      <xsl:text>&lt;!--</xsl:text>
+      <xsl:value-of select="."/>
+      <xsl:text>--&gt;</xsl:text>
+    </div>
+  </xsl:template>
+
+  <xsl:template match="comment()[string-length(.) &gt; 50]">
+    <div class="expander-open">
+      <xsl:call-template name="expander"/>
+
+      <span class="comment">
+        <xsl:text>&lt;!--</xsl:text>
+      </span>
+      <div class="expander-content comment">
+        <xsl:value-of select="."/>
+      </div>
+      <span class="comment">
+        <xsl:text>--&gt;</xsl:text>
+      </span> 
+    </div>
+  </xsl:template>
+  
+  <xsl:template name="expander">
+    <div class="expander">&#x2212;</div>
+  </xsl:template>
+
+</xsl:stylesheet>