Firefox NTLM

[Guest]

[rrm]

I am have a weird issue with Firefox.  When I use the content filter with NTLM authentication, IE8 works seamless with no pop up box but Firefox constantly asks for authentication.  If i hit cancel the websites show but every click results in a login box.  Anyone experience this? 

Windows 2003 domain

Endian 2.4

Edit:
Internet Explorer is the only browser that will authenticate without having to type in a user/pass.  If this is normal I may have to scrap this and go back to the drawing board :/