Web site on IIS 7 asking for Windows authentication only when using Firefox and not Internet Explorer?

I have a web site on IIS 7, and it asks for Windows authentication when I try to access it with Firefox, but it works fine if I use Internet Explorer. With Internet Explorer it uses the normal form 开发者_StackOverflow社区authentication. How is this possible?

Firefox does not have NTLM enabled by default, meaning Firefox will not pass along your NT identity to the website. This is enabled by default in Internet Explorer.

You can enable it for selected sites by going to "about:config" and by editing the network.automatic-ntlm-auth.trusted-uris preference.