Integrated Windows Authentication in Firefox

I couldn't figure out why Firefox was prompting for login, but IE was not. The web application uses NTLM authentication. I found out there's a browser setting under about:config called network.automatic-ntlm-auth.trusted-uris. It accepts comma and space separated list of server names that will use integrated Windows authentication. (webserver1, test2, svr3). Now I don't have to re-enter my username & password.