Added chrome://pref for the prefs window.

rdf/chrome/build/registry.rdf

@@ -120,6 +120,24 @@
 
   </chrome> 
 
+  <chrome ID="chrome://pref/"> 
+
+    <skin> 
+      <RDF:Description ID="chrome://pref/skin/">
+	    <base>resource:/chrome/pref/skin/default/</base>
+        <main>pref.css</main> 
+      </RDF:Description> 
+    </skin> 
+
+    <content> 
+      <RDF:Description ID="chrome://pref/content/">
+	    <base>resource:/chrome/pref/content/default/</base>
+        <main>PrefsWindow.xul</main> 
+      </RDF:Description> 
+    </content> 
+
+  </chrome> 
+
 </RDF:RDF>