To start using your Fortitoken with Firefox we need to load the security device information into Firefox. Get to the Security Devices settings under Preferences –> Advanced —> Encryption

Now we’re going to load the libcastle.so.1.0.0 module (found in the Fortitoken middleware available on the Fortinet support site), I have previously moved this module to /usr/lib/

Once the module is loaded you  can now authenticate against websites that require certificate authentication via your Fortitoken