--- ./defaults/pref/firefox.js.orig	2005-02-25 20:16:44.000000000 -0800
+++ ./defaults/pref/firefox.js	2005-03-08 13:56:32.000000000 -0800
@@ -318,3 +318,7 @@
 
 // plugin finder service
 pref("pfs.datasource.url", "chrome://mozapps/locale/plugins/plugins.properties");
+
+// use Thunderbird as the default external email app
+pref("network.protocol-handler.app.mailto", "/usr/bin/thunderbird");
+