no effect on Tp, undoing again

xpfe/bootstrap/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");