We are attempting to use ADFS with Kerberos. The /adfs/ls/wia URL works out of box with both Internet Explorer and Google Chrome, but we unable to make it work in Firefox Quantum. Instead we are presented with a completely blank screen. We are running ADFS 3.0 on Windows Server 2012 R2 with NTLM traffic disabled. When we temporarily enable NTLM on the ADFS server, Kerberos authentication works. We have also tried on a Windows Server 2016 box running ADFS 4.0 and we get the same results. Have have ensured that the WIA user agent includes Mozilla 5.0 and up. We have also tried adjusting the URIS in about:config as suggested online to include our domain for the following values: network.automatic-ntlm-auth.trusted-uris network.negotiate-auth.trusted-uris We are wondering if there are any further configurations that we may need to get this to work. Thanks