Run this in your Browser Console[1] to delay signature checking for a day: function set_xpi_sign_time_now() { const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm"); const now = (new Date()).getTime() / 1000; Services.prefs.setIntPref('app.update.lastUpdateTime.xpi-signature-verification', now); } set_xpi_sign_time_now(); EDIT: Changed `Components.utils.import` to `ChromeUtils.import` because ap…
edit: nope, you cannot:(