A while ago, I showed you how to get a free certificate from CACert.org. Now I’ll talk about getting that certificate out of Firefox, and importing it into OS X Keychain so that you can use it for secure e-mail. You might want to brush up on how Keychain works if you’ve never used it before. The first step is removing the certificate from Firefox. Go to Firefox->Preferences and click the “advanced” logo at the top, then the “encryption” tab. Finally, click the “View Certificates” button. You should see a list of all the certificates you have. Unless you went through the trouble of getting your CACert certificate assured, it’ll just say “CACert WoT User” If you highlight the certificate[…]