Firefox 3 (mac)

To install the Certificate Authority certificate in firefox 3 on the mac:

Download cacert.pem from the parent page.

From the Preferences dialog - choose the Advanced Tab, then the Encryption sub-tab:

On this tab choose the "View Certificates" button, then on the dialog that pops up, choose the Authorities tab:

Choose the import button and select the downloaded cacert.pem. Check all checkboxes and confirm:

Scroll down and confirm the certificate is present: