t: pref
i: /browser/app/profile/firefox.js
o: /browser/app/profile/firefox.js

+pref("browser.search.defaultenginename", "QGato");
+pref("browser.search.defaultenginename.US", "QGato");
+pref("browser.search.order.1", "QGato");
+pref("browser.search.order.2", "DuckDuckGo");
+pref("browser.search.order.3", "Startpage");