title: Can't Delete Expired Apple Developer Certificate
body: <p>I've followed the instructions described <a href="https://stackoverflow.com/questions/35390072/this-certificate-has-an-invalid-issuer-apple-push-services">here</a> to get my certificate renewed (Apple's certificate debacle from earlier this year).</p>
  
  <p>Problem: Every time I restart Safari's Extension Builder, it adds the expired certificate back.<a href="https://i.stack.imgur.com/OEMfb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OEMfb.png" alt="enter image description here"></a></p>
  
  <p>In the Extension Builder, it says "No Safari Extension Certificate"</p>