In a previous post I created a tutorial for how to stop SharePoint from prompting for credentials in Internet Explorer, but what if FireFox is your default browser?

Unfortunately, it is not as easy to add a trusted intranet site in FireFox, because the option doesn’t appear in the Setting menu.  Additionally, FireFox uses a prefs.js file to store user preferences, and this file should not be edited. You can, however, overwrite these preferences with a user.js file.

Here are the steps you should follow to add a trusted intranet site in FireFox:

  1. Click on your windows Start button.
    Windows Start Button
  2. On the Start screen select the Search icon.
    Windows Search Icon
  3. Paste the following in the searchbox: %APPDATA%\Mozilla\Firefox\Profiles\ and push the enter key.
    Windows Search FireFox Profile
  4. Your FireFox Profile folder should display. Open the folder.
    FireFox Preferences
  5. You should see a file called prefs.js. Right click on the file and go to Copy.
    FireFox Prefs Copy
  6. Right click on an empty place in the folder and select Paste. You should now have a new file named prefs_copy.
    Firefox Prefs Paste
  7. Right click on the prefs_copy file and click Rename.
    FireFox Prefs Copy Rename
  8. Type the word user and press enter.
    Prefs Renamed as User
  9. Double-click the user.js file to open it. Select and Delete ALL of the contents, and replace the contents with the following:

    // authenticate intranet sites
    pref(“network.automatic-ntlm-auth.allow-proxies”, true);
    pref(“network.automatic-ntlm-auth.trusted-uris”, “,”);

  10. Update “,” with the name or names of your SharePoint intranet site and Save the file.
    FireFox Custom User Preferences
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