Overview This document describes how to prevent authentication prompts in Firefox web browser when accessing sites that use Microsoft Active Directory Federated Services (ADFS). Symptoms When going to a web site that uses Swinerton's ADFS for single sign-on using the Firefox web browser, there is a pop-up to enter the Swinerton username/password.  This document describes how to configure Firefox so that authentication happens automatically and the pop-up does not appear, and the user does not need to enter their username and password. Resolution Procedure Add the URL of the Identity Provider (IdP) server as a trusted NTLM authentication source. In the Firefox address bar, type about:config. The browser will display a warning message, click Continue. Search for network.automatic. Double click on network.automatic-ntlm-auth.trusted-uris to modify the configuration. Enter the IdP redirect address. For example https://adfs.example.com. Click OK to exit the dialog box. Reference This is based on the article: https://www.cisco.com/c/en/us/support/docs/security/cloud-web-security/200560-Prevent-Repeated-Authentication-Prompts.html