1. Start the Firefox browser.
  2. In the address bar, enter about:config.
  3. If you are presented with a security warning, click Accept the risk and continue.
  4. In the Search field, enter network.negotiate-auth.trusted-uris and then click the pencil icon.
  5. Do one of the following:
    • If the environment is not configured with a custom domain, enter the two trusted addresses separated by a comma, and then click the check mark icon.
    • If the environment is configured with a custom domain, enter the custom domain and then click the check mark icon.

      For more information about the trusted URI values, see Configuring end user browsers.