use the right throbber.

profile/pref-migrator/resources/pmunprog.xul

@@ -1,5 +1,6 @@
 <?xml version="1.0"?> 
-<?xml-stylesheet href="chrome://global/skin/xul.css" type="text/css"?> 
+<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
+
 <!DOCTYPE window SYSTEM "resource:/res/profile/pmunprog.dtd" >
 
 
@@ -19,9 +20,7 @@
             <html:div> <html:h3> &dialogTitle.label; </html:h3> </html:div>
           </box>
           <spring flex="100%"/>
-          <box align="horizontal">
-            <html:img src="resource:/res/throbber/anims00.gif"/>
-          </box>
+	<html:img src="chrome://navigator/skin/animthrob_single.gif"/>
         </box>
 
         <box align="vertical">