XPInstall is a mess. At least making sure it has the global skin until something better can be done.

xpinstall/res/content/institems.xul

@@ -1,5 +1,5 @@
 <?xml version="1.0"?> 
-<?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?>
+<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
 
 <!DOCTYPE window SYSTEM "chrome://xpinstall/locale/institems.dtd">
 

xpinstall/res/content/progress.xul

@@ -1,5 +1,5 @@
 <?xml version="1.0"?> 
-<?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?>
+<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
 
 <!DOCTYPE window SYSTEM "chrome://xpinstall/locale/progress.dtd" >
 

xpinstall/res/content/xpistatus.xul

@@ -1,4 +1,6 @@
 <?xml version="1.0"?> 
+
+<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
 <?xml-stylesheet href="resource:/res/xpinstall/xpistatus.css" type="text/css"?> 
 <!DOCTYPE window SYSTEM "chrome://xpinstall/locale/xpistatus.dtd" >