diff --git a/suite/browser/browser-prefs.js b/suite/browser/browser-prefs.js
index 4cafeca8f600..d2f2cc1d3ad2 100644
--- a/suite/browser/browser-prefs.js
+++ b/suite/browser/browser-prefs.js
@@ -56,6 +56,8 @@ pref("general.open_location.last_window_choice", 0);
 
 pref("general.smoothScroll", false);
 
+#expand pref("general.useragent.extra.__MOZ_APP_NAME__", "__MOZ_APP_DISPLAYNAME__/__MOZ_APP_VERSION__");
+
 // 0 = blank, 1 = home (browser.startup.homepage), 2 = last
 pref("browser.startup.page",                1);
 pref("browser.startup.homepage",	   "chrome://navigator-region/locale/region.properties");