Apple's WWDR certificate has expired today. I deleted it from Keychain Access, both from loginand systemas described here . I also downloaded and imported a new version of the WWDR certificate.
However, when I open Safari Extension Builder and create / add an extension, the old WWDR certificate returns to Keychain Access, and I see the warning “No Safari extension certificates” in Extension Builder. I made sure that I have a valid Safari certificate in Keychain.
How to completely remove an obsolete WWDR certificate so that it does not appear again when I work on Safari extensions? I tried to remove the Safari folder from the library directory and restart my Mac, but that did not help.
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