http://mycroft.mozdev.org/deepdocs/quickstart.html#c202
@21 Ele:
To force Firefox to always use alphabetical order, you can use this in your user.js:
user_pref("browser.search.useDBForOrder", false);
Mozilla/5.0 (Windows; U; Windows NT 5.1; es-ES; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6