gentoo-overlay/www-client/firefox-bin/files/all-gentoo-2.js

// Ensure preference can't be changed by users
lockPref("app.update.auto", false);
lockPref("app.update.enabled", false);

// Allow user to change based on needs
defaultPref("browser.display.use_system_colors", true);
defaultPref("spellchecker.dictionary_path", "/usr/share/myspell");
defaultPref("browser.shell.checkDefaultBrowser", false);
defaultPref("intl.locale.requested", "");

// Preferences that should be reset every session
pref("browser.EULA.override", true);