--- a/modules/libpref/src/init/all.js	2009-11-25 16:27:04.560941108 +0800
+++ b/modules/libpref/src/init/all.js	2009-11-25 16:27:14.510959940 +0800
@@ -910,7 +910,7 @@
 pref("intl.charset.detector",               "chrome://global/locale/intl.properties");
 pref("intl.charset.default",                "chrome://global-platform/locale/intl.properties");
 pref("intl.ellipsis",                       "chrome://global-platform/locale/intl.properties");
-pref("intl.locale.matchOS",                 false);
+pref("intl.locale.matchOS",                 true);
 // fallback charset list for Unicode conversion (converting from Unicode)
 // currently used for mail send only to handle symbol characters (e.g Euro, trademark, smartquotes)
 // for ISO-8859-1