Index: mozilla/browser/app/profile/firefox.js
===================================================================
--- mozilla.orig/browser/app/profile/firefox.js	2012-03-10 02:03:53.000000000 +0000
+++ mozilla/browser/app/profile/firefox.js	2012-03-11 00:34:58.498911185 +0000
@@ -236,7 +236,6 @@
 // "use the search service's default engine"
 pref("keyword.URL", "");
 
-pref("general.useragent.locale", "@AB_CD@");
 pref("general.skins.selectedSkin", "classic/1.0");
 
 pref("general.smoothScroll", true);
Index: mozilla/browser/locales/en-US/firefox-l10n.js
===================================================================
--- mozilla.orig/browser/locales/en-US/firefox-l10n.js	2012-03-10 02:04:21.000000000 +0000
+++ mozilla/browser/locales/en-US/firefox-l10n.js	2012-03-11 00:36:47.458915661 +0000
@@ -35,5 +35,3 @@
 # ***** END LICENSE BLOCK *****
 
 #filter substitution
-
-pref("general.useragent.locale", "@AB_CD@");