Since stupid decision by browsers to remove green bar, this plugin is a way to fill that security gap

Not working with ip addresses (only with domains)

This Plugin is not working for me, firefox 82. Shows on several site. ERROR: Fingerprint for certificate not found. Certificate Chain of one router at home: https://pastebin.com/FLBWWFCB
certificate of vodafone.de: https://pastebin.com/VL53iUJL
Would really like to use this plugin, even if several site facebook and youtube are changing certificates every 2 month.

A sole add-on which is able to pin certificates! It helped me hundred times, especially when certificates change our of nowhere. Guys, this add-on will protect you from SSL stripping MITM attack - use it wisely

Love it. Very easy and intuitive UI

Let's you manually pin certificates and show an overview of them. Also shows you the current status in as a badge in the icon.
I like it!