6.2 Firefox
On Firefox, automatic login is disabled by default. To activate it proceed as follows:
In the URL bar, enter about:config and confirm the subsequent
security warning:
In Firefox, the configuration can be found under about:config
In the settings, search for network.negotiate-auth.trusted-uris and adjust
the value so that it includes the domain of your AGW with a leading dot.
Multiple values are separated by commas (e.g. .example.com,.example.net).
The value you are looking for is called network.negotiate-auth.trusted-uris