Comment 10 for bug 1081015

This can't be bug 776490 because we pick that up by default - its shared code.

Dirk, have you tried reproducing this in Firefox? I think this might actually be the answer to the issue:

http://mike.kaply.com/2012/08/01/major-change-setting-default-preferences-for-firefox-14/

You need to place syspref.js into /usr/lib/thunderbird/defaults/preferences/ (not pref)