How to clear all SSL certificate exceptions?

I want to erase all certificate exceptions, in other words, to return to the original set of SSL certificates secure by default. I found the Manager certificates and its large lists of things trust, but I don't know which of them bundled with Firefox and which of them were added by me at some point in the past. How can I do this?

Rename or remove the file cert8.db in the profile folder to delete all intermediate certificates that Firefox has stored by visiting secure Web sites.

Certificates roots of build-in will display as "Builtin symbolic object" and intermediate certificates stored as 'software security device.

Rename or remove the cert_override.txt (cert_override.txt.old) file in the Firefox profile folder to remove any permanent exceptions that you have saved.

Tags: Firefox

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