You have noticed that when you are using Internet Explorer and you browse to your companies intranet page that it will automatically authenticate you but when you use Firefox you will be prompted with a login box!

This simple procedure how to set a preference in Firefox that will pass the NTLM authentication information to a web server. The preference is network.automatic-ntlm-auth.trusted-uris.

So how do you do it?

1. Open Firefox and type about:config in the address bar. (without the quotes of course)
2. In the Filter field type the following network.automatic-ntlm-auth.trusted-uris
3. Double click the name of the preference that we just searched for
4. Enter the URLs of the sites you wish to pass NTLM auth info to in the form of: http://intranet.company.com, http://intranet

Notice that you can use a comma separated list in this field.