The extension does not work with Firefox multi-account containers.

[0c0d3]

Install Firefox Multi-Account Containers add your site, and you will see that the extension Certainly Something (Certificate Viewer) does not work.

Operating System: Windows 11
Firefox version: 112.0.1

[rugk]

This is nowadays built in into Firefox, no need for this extension anymore. See https://support.mozilla.org/en-US/kb/secure-website-certificate#w_viewing-a-certificate

[rugk]

See #68