Authentication issue with Firefox using AD-SSO

Question

Hi, 
 Having SG310 with UTM 9.351-3 with AD portal setup and importing the users from the AD into Sophos every night and default authentication AD-SSO. 
 Follwed https://community.sophos.com/kb/en-US/120791 for the setup, no problems with Chrome and IE, but having an issue with Firefox. 
 When opening Firefox without running any other browser, trying to open Google.com for example will have the pop-up window asking for authentication (the value network.automatic-ntlm-auth.trusted-uris has been set ). 
 When opening Firefox with chrome running in the same time, no pop up message 
 Many thanks, 
 Abdullah

Emile Belcourt · Accepted Answer

Hi Abdullah, 
 Feedback from a customer was to create an On Logon script via Group policy that would distribute the following: 
 Create the file local-settings.js with the following: 
 pref("general.config.filename", "mozilla.cfg"); 
 pref("general.config.obscure_value", 0); // use this to disable the byte-shift 
 Create the file mozilla.cfg with the following: 
 // 
 lockPref("network.automatic-ntlm-auth.allow-non-fqdn", true); 
 lockPref("network.negotiate-auth.allow-non-fqdn", true); 
 The cfg file must have the // at the top of the file otherwise it&rsquo;ll be ignored. 
 The js file needs dropping into the Mozilla Firefox\defaults\pref directory (in our instance C:\Program Files (x86)\Mozilla Firefox\defaults\pref) and the cfg file needs dropping into the Mozilla root directory (in our instance C:\Program Files (x86)\Mozilla Firefox) 
 There doesn&rsquo;t appear to be a need to add: 
 lockPref("network.automatic-ntlm-auth.trusted-uris", " 
 Hopefully this helps. This allows you to do NTLM through Firefox which is disabled by default. 
 Emile