Today, Apple's WWDR certificate expired. I've removed it from Keychain Access, both from login and system, as described here. I've also downloaded and imported a new version of WWDR certificate.
However, when I open Safari Extension Builder and create/add an extension, the old WWDR certificate gets back to Keychain Access and I see "No Safari Extensions Certificate" warning in Extension Builder. I made sure I have a valid Safari certificate in Keychain.
How do I delete expired WWDR certificate completely so it doesn't appear again when I work on Safari extensions? I've tried removing Safari folder from Library directory and restarting my Mac, but it didn't help.
