certainly-something
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The extension does not work with Firefox multi-account containers.
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
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
See https://github.com/april/certainly-something/issues/68