whoops, I removed the title from this window.

profile/pref-migrator/resources/content/profileMigrationProgress.xul

@@ -7,6 +7,7 @@
 	xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" 
 	align="vertical"
 	onload="onLoad()"
+	title="&window.title;"
 	class="dialog"> 
 
 <html:script language="javascript" src="chrome://profile/content/profileMigrationProgress.js"/>