Disable password manager:
// Disable password saving:
lockPref("signon.autofillForms", false)
lockPref("signon.rememberSignons", false)
Disable updates:
// disables autoupdates & updates for apps, search engines, extensions
pref("app.update.enabled", false);
pref("browser.search.update", false);
pref("extensions.update.enabled", false);
pref("app.update.autoUpdateEnabled", false);
pref("extensions.update.autoUpdateEnabled", false);
pref("extensions.update.autoUpdateDefault", false);