14) Reduce RAM usage further for when Firefox is minimized. This setting will move Firefox to your hard drive when you minimize it, taking up much less memory. And there is no noticeable difference in speed when you restore Firefox, so it’s definitely worth a go. Again, go to about:config, right-click anywhere and select New-> Boolean. Name it “config.trim_on_minimize” and set it to TRUE. You have to restart Firefox for these settings to take effect.
funziona anche con Thunderbird e Sunbird.
Mentre per il primo è sufficiente andare in
Strumenti->Opzioni->Avanzate->Editor di configurazione
e quindi aggiungere la chiave come descritto sopra, in Sunbird bisogna modificare manualmente il file prefs.js presente nella cartella del profilo.