- Open Firefox.
- Type about:config in the address bar.
- You will be warned. Agree if you want to continue 🙂
- You can look through the list or simply type network.automatic in the Filter at the top of the the screen. Look for a line that is called network.automatic-ntlm-auth.trusted-uris. Double-click that.
- You can now type in your sites separated by commas
- Click OK and that all!