My computer and user belonging to the domain, I want to connect to my NTLM-SSO-enabled intranet website http://intranet without providing a login/password.

How to do it with Mozilla Firefox?

5 Answers 5

  • When accessing the relevant site you need to make sure you run Firefox as the Windows user you want to log on as. If you always log onto a workstation as a domain user then there is no issue, otherwise you may need to Shift + right-click the shortcut and choose Run as different user..., or setup a shortcut with your credentials saved
  • In Firefox, type about:config In the address bar and press return.
  • After the config page loads, in the filter box type: network.automatic. You should see a search result of network.automatic-ntlm-auth.trusted-uris
  • Modify network.automatic-ntlm-auth.trusted-uris by double clicking the row and enter the relevent site
  • Multiple sites can be added by comma delimiting them such as: https://your_SecureAuth_FQDN.com, https://www.replacewithyourintranetsite.com
  • Click OK. You may need to restart Firefox for changes to take effect.

This is based on numerous pages I found on the internet, including this Firefox support page

  • 1
    this does not work. i have read the same thing on many pages. is there an update for firefox v30
    – shorif2000
    Jun 24, 2014 at 15:12
  • 1
    @sharif: Try using the downloading the following add-on: addons.mozilla.org/en-US/firefox/addon/… then click Tools->Integrated Authentication Sites and check the box at the bottom that says Enable pass-through on all non-FQDN sites even if they aren't listed here
    – James P
    Jun 24, 2014 at 15:25
  • 2
    @sharif: The issue that affects Firefox 30 specifically is that insecure v1 of NTLM has been disabled by default. It could be that you need to use the about:config editor to set network.negotiate-auth.allow-insecure-ntlm-v1 to be true. However, NTLMv1 is very old, so I'm not sure if you would be using it. Relevant link: developer.mozilla.org/en-US/Firefox/Releases/30/…
    – James P
    Jun 24, 2014 at 15:34
  • 1
    Nothing works so far. Whatever I try from all answers here, FF keeps popping that annoying dialog prompt with (already saved!) username and password. Very un-thought design on FF side, I must say...
    – Van Jone
    Sep 9, 2015 at 14:04
  • 3
    Depending on the situation it might be worth trying with network.automatic-ntlm-auth.allow-non-fqdn set to true, although for me it still worked when set to false and not specifying a domain. Unfortunately Mozilla have made these settings far too numerous and complex
    – James P
    Sep 9, 2015 at 14:39

To authenticate Firefox automatically through a proxy (avoiding NTLM prompt), you have to modify 3 parameters.

  • Open the page about:config (in the address bar)

Add your uris (separate with ,) in the following 3 parameters:

  • network.automatic-ntlm-auth.trusted-uris
  • network.negotiate-auth.delegation-uris
  • network.negotiate-auth.trusted-uris

and change it with the URL of your proxy redirection page, like http://myproxy.local


  • signon.autologin.proxy to be true

If you do it by script, be careful with the dots (.) and the dash (-) in the parameters. This is often the problem.

  • network.negotiate-auth.trusted-uris works for me. Eg. when subdomain1.companydomain.cz/identitity/auth is page where authentication through NTML is done, you have tu put value subdomain1.companydomain.cz (ie. protocol and full domain, without path). Note that values are comma (,) separated. Apr 6, 2018 at 8:27
  • Works perfectly for me. My organization uses windows based single sign-on. Tested on firefox v61.0.2
    – Adarsh
    Aug 14, 2018 at 11:30

The suggested solution with network.automatic-ntlm-auth.trusted-uris was not enough in my case. Then I tried the same in network.negotiate-auth.trusted-uris Now it works.

  • 3
    Still not working: FF keeps popping that annoying dialog prompt with already saved username and password
    – Van Jone
    Sep 9, 2015 at 14:01

This worked for me:

Change network.automatic-ntlm-auth.allow-non-fqdn to True and signon.autologin.proxy to True

Add yourcompanyname.com in:



I modified signon.autologin.proxy to be true (by double-clicking on the preference name) and changed network.negotiate-auth.trusted-uris to timecard.example.com and it's working for me, almost too well. When I sign out of the page, it takes me to a sign-in screen, where I'm instantly logged in again. But I can live with that. What is missing is a way to either (a) add another URI with a single click, or (b) use wildcards, such as *.example.com.

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