diff --git a/modules/libpref/src/init/all.js b/modules/libpref/src/init/all.js
index 8876bf8f771..7b18d2f0bac 100644
--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -46,6 +46,7 @@ pref("network.search.url","http://cgi.netscape.com/cgi-bin/url_search.cgi?search
 pref("keyword.URL", "http://keyword.netscape.com/keyword/");
 pref("keyword.enabled", false);
 pref("general.useragent.locale", "chrome://navigator/locale/navigator.properties");
+pref("general.useragent.contentlocale", "chrome://navigator/locale/navigator.properties");
 pref("general.useragent.misc", "rv:1.1b");
 
 pref("general.startup.browser",             true);
diff --git a/xpfe/browser/resources/locale/en-US/navigator.properties b/xpfe/browser/resources/locale/en-US/navigator.properties
index 7effe381ea2..d532f334ce6 100644
--- a/xpfe/browser/resources/locale/en-US/navigator.properties
+++ b/xpfe/browser/resources/locale/en-US/navigator.properties
@@ -18,6 +18,7 @@ jserror=An error has occurred on this page. Double click here for details.
 # all.js
 #
 general.useragent.locale=en-US
+general.useragent.contentlocale=US
 font.language.group=x-western
 intl.accept_languages=en-us, en
 intl.charsetmenu.browser.static=iso-8859-1