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echo | openssl s_client -connect FOO.COM:443 2>&1 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > FOO.COM.pem

in Firefox go to Edit -> Preferences -> Advanced -> Encryption -> View Certificates -> Servers -> Import -> FOO.COM.pem -> select FOO.com on the Servers tab -> Edit trust -> Mark it as trusted.

But: How can I do this in Chromium? (without addig cert as CA)

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