Configure

• prefs.js

• user.js

Client certificates

user_pref("browser.tabs.closeWindowWithLastTab", false);
user_pref("browser.urlbar.trimURLs", false);
user_pref("full-screen-api.warning.timeout", 0);
user_pref("security.default_personal_cert", "Ask Every Time");
user_pref("security.default_personal_cert", "Select Automatically");