Firefox: Add a Trusted CA in Categories Apache, CentOS, Debian / Ubuntu, Fedora Linux, FreeBSD, Gnome, HP-UX Unix, Linux, Mac OS X, Mozilla Software, Networking, OpenBSD, openssl, RedHat and Friends, Solaris-Unix, Suse, Ubuntu Linux, UNIX, Windows last updated August 31, 2009The default Firefox comes with certificates from well-known commercial CAs. My ISP is also CA and Firefox cannot verified it because the CA is not recognized. How do I force Firefox to accept my ISPs certificate?