If you use Firefox along with Internet Explorer, each time you want to open up an internal network site or SharePoint or Team System Web Access etc…you have to provide your windows credentials or log in with some valid details. This will repeat with every page you access and have to use Internet Explorer to stop Firefox annoying you.

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You have to enable NTLM using the following steps, so that Firefox will authenticate automatically.

  1. Open Firefox
  2. Type about:config in the address bar and hit Enter.
  3. Type network.automatic in the top Filter bar
  4. Right click network.automatic-ntlm-auth.trusted-uris and click Modify
  5. Enter only the names of your internal(SharePoint) servers in a comma-delimited list. For example: lon-ad-01,contoso and click OK.
  6. Restart Firefox

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You should be able to access all of your SharePoint sites on the servers you entered through Firefox now without providing credentials repeatedly.

The above setting is usually stored in " prefs.js " in the following directory:

C:\Documents and Settings\<username>\Application Data\Mozilla\Firefox\Profiles\<uniqueid>.default