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();
This does the equivalent of setting in about:config the time of last signature verification to the current time. By default, Firefox re-checks signatures in 24 hours (or so I read somewhere here). I like the temporary effect of this, compared to the permanent disabling of signature verification suggested elsewhere.
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1: https://developer.mozilla.org/en-US/docs/Tools/Browser_Conso...
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