The most popular way to get that is: https://addons.mozilla.org/en-US/firefox/addon/certificate-patrol/ https://addons.mozilla.org/en-US/firefox/addon/certifica

The most popular way to get that is: https://addons.mozilla.org/en-US/firefox/addon/certificate-patrol/ https://addons.mozilla.org/en-US/firefox/addon/certificate-p... I personally no longer use it because of all the noise, even before lets encrypt.