how to set a preference in Firefox that will pass the NTLM authentication information to a web server. The preference is network.automatic-ntlm-auth.trusted-uris. In order to change your Firefox Configuration please do the following steps : # In the [[Location bar autocomplete|Location bar]], type '''about:config''' and press '''Enter'''. The about:config "''This might void your warranty!''" warning page may appear. # Click '''I'll be careful, I promise!''' to continue to the about:config page. #Change the preference If your network does not use SSO it is also possible to try this add on: [https://addons.mozilla.org/en-us/firefox/addon/integrated-auth-for-firefox/] Another solution: [http://superuser.com/questions/594049/how-to-enable-ntlm-for-all-intranet-sites-in-firefox]