1. 需要NSS工具包（主要是addbuildin工具）

这里提供一个链接：http://ftp.mozilla.org/pub/mozilla.org/security/nss/releases/NSS_3_15_1_RTM/src/nss-3.15.1-with-nspr-4.10.tar.gz

2. 参照firefox源包根目录下的security/nss/lib/ckfw/builtins目录里面README文件的说明，添加自定义证书即可。

This README file explains how to add a builtin root CA certificate to NSS
or remove a builtin root CA certificate from NSS.

The builtin root CA certificates in NSS are stored in the nssckbi PKCS #11
module. The sources to the nssckbi module are in this directory.

I. Adding a Builtin Root CA Certificate

You need to use the addbuiltin command-line tool to add a root CA certificate
to the nssckbi module. In the procedure described below, we assume that the
new root CA certificate is distributed in DER format in the file newroot.der.

1. Add the directory where the addbuiltin executable resides to your PATH
environment variable. Then, add the directory where the NSPR and NSS shared
libraries (DLLs) reside to the platform-specific environment variable that
specifies your shared library search path: LD_LIBRARY_PATH (most Unix
variants), SHLIB_PATH (32-bit HP-UX), LIBPATH (AIX), or PATH (Windows).

2. Copy newroot.der to this directory.

3. In this directory, run addbuiltin to add the new root certificate. The
argument to the -n option should be replaced by the nickname of the root
certificate.

    % addbuiltin -n "Nickname of the Root Certificate" -t C,C,C < newroot.der >> certdata.txt
    % addbuiltin -n "Nickname of the Root Certificate" -t CT,C,C < newroot.der >> certdata.txt

4. Edit nssckbi.h to bump the version of the module.

5. Run gmake in this directory to build the nssckbi module.

6. After you verify that the new nssckbi module is correct, check in
certdata.txt and nssckbi.h.

II. Removing a Builtin Root CA Certificate

1. Change directory to this directory.

2. Edit certdata.txt and remove the root CA certificate.

3. Edit nssckbi.h to bump the version of the module.

4. Run gmake in this directory to build the nssckbi module.

5. After you verify that the new nssckbi module is correct, check in
certdata.txt and nssckbi.h.