--- mail/app/profile/all-thunderbird.js~	2013-09-12 09:29:19.000000000 +0800
+++ mail/app/profile/all-thunderbird.js	2013-09-23 13:46:50.177714670 +0800
@@ -211,7 +211,7 @@
 pref("general.autoScroll", true);
 #endif
 
-pref("mail.shell.checkDefaultClient", true);
+pref("mail.shell.checkDefaultClient", false);
 pref("mail.spellcheck.inline", true);
 
 pref("mail.folder.views.version", 0);