FireFox and SharePoint 2007
If you want FireFox and SharePoint 2007 work with NTLM an SSO authentication, you have to go to your Firefox address bar and type about:config. This will bring up the internal config editor, which allows you to set all kinds of properties that influence Firefox’s behavior. Look for the key called network.automatic-ntlm-auth.trusted-uris. Set that key’s value to a comma separated list of servers you want NTLM auth for.