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

Great addon, deserves much more range

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!