Office 365: Configure Firefox for Single Sign On

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NOTE: Performing these steps will enable Single Sign On for university-owned, domain-joined computers.



  1. Open Firefox.
  2. Open a new web browser tab.
  3. Type about:config in the address bar.
  4. Press [Enter].
  5. Click I’ll be careful, I promise! in the warning window.
    I'll be careful
  6. Type network.automatic into the search bar.
  7. Press [Enter] on the keyboard.
  8. Select the network.automatic-ntlm-auth.trusted-uris option from the list by double-clicking.
  9. Type into the Enter string value box that appears.
  10. Click OK.
    string value
  11. The network.automatic-ntlm-auth.trusted-uris option should now look as option
  12. Restart Firefox.
  13.  Log into your site. The logged on credentials will be passed through to the web server.


  1. Open Firefox.
  2. Open a new browser tab.
  3. In the address bar, type about:config to display the list of current configuration options.
  4. Type negotiate in the Filter field to restrict the list of options.
  5. Double-click the network.negotiate-auth.trusted-uris entry to display the Enter string value dialog box.
  6. Type UWEC.EDU.
  7. Click OK.