Het is makkelijker een user.js bestand aan te maken met de door jou gewenste instellingen en die dan in de profieldirectory van Firefox te kopiëren. Dat is ook handig als je ooit moet herinstalleren of het op een andere computer wil toepassen.
Dit is de user.js die ikzelf gebruik:
user_pref("browser.block.target_new_window", true);
user_pref("browser.cache.memory.capacity", 65536);
user_pref("browser.cache.memory.enable", true);
user_pref("browser.cache.disk.parent_directory", "/tmp");
user_pref("browser.tabs.opentabfor.middleclick", true);
user_pref("browser.tabs.opentabfor.urlbar", true);
user_pref("browser.display.show_image_placeholders", false);
user_pref("browser.sessionhistory.max_total_viewers", 3);
user_pref("browser.xul.error_pages.enabled", true);
user_pref("network.http.pipelining", true);
user_pref("network.http.pipelining.ssl", true);
user_pref("network.http.proxy.pipelining", true);
user_pref("network.http.pipelining.maxrequests", 8);
user_pref("network.http.max-connections", 96);
user_pref("network.http.max-connections-per-server", 32);
user_pref("network.http.max-persistent-connections-per-proxy", 24);
user_pref("network.http.max-persistent-connections-per-server", 12);
user_pref("network.dns.disableIPv6", true);
user_pref("plugin.expose_full_path", true);
user_pref("ui.submenuDelay", 0);
user_pref("config.trim_on_minimize", true);
user_pref("content.interrupt.parsing", true);
user_pref("content.max.tokenizing.time", 2250000);
user_pref("content.notify.backoffcount", 5);
user_pref("content.notify.interval", 750000);
user_pref("content.notify.ontimer", true);
user_pref("content.switch.threshold", 750000);
user_pref("nglayout.initialpaint.delay", 0);
user_pref("image.mem.min_discard_timeout_ms", 5000);