user_pref is used before the prefs in user.js - not merely user

As to the validity of the actual preferences, I can't comment as I am not familiar with the 'network' prefs.

I had the settings with user_pref according to this:

https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/A_brief_guide_to_Mozilla_preferences

user_pref or pref should work. I can switch it back and test again, but I've previously used both.

site-list = "internaldomain.com,sctwsgateway.internaldomain.com:8080,gateway:8080,gateway:8080"; user_pref("network.negotiate-auth.trusted-uris", "internaldomain.com,gateway.internaldomain.com:8080,gateway:8080,gateway:8080); user_pref("network.negotiate-auth.delegation-uris", site-list); user_pref("network.automatic-ntlm-auth.trusted-uris", site-list); user_pref("network.automatic-ntlm-auth.allow-non-fqdn", true); user_pref("network.automatic-ntlm-auth.allow-proxies", true); user_pref("browser.shell.checkDefaultBrowser", false);

Same result unfortunately. Thanks for the thought though.

Those preferences all exist in about:config. Do you have another setting you can suggest I add to the file to test it takes effect?

Sorry, I am not a developer just an advanced Firefox user starting in 2002 with Phoenix 0.3. I have always used user_pref in user.js. And the original 'bible' for advanced Firefox users - http://kb.mozillazine.org/User.js_file - shows user_pref as the syntax to use.

I suspect that pref is appropriate for a mozilla.cfg file only - https://developer.mozilla.org/en-US/Firefox/Enterprise_deployment - as shown under Configuration in that article.

What I have learned thru experience with user.js over the years is With user.js if there is one faulty or invalid pref Firefox won't read the user.js file any further; only the prefs above the faulty pref will be read. Usually you can figure out where Firefox stopped reading the user.js by viewing the prefs.js file in the Profile folder; the prefs above the faulty pref will make it to prefs.js but the faulty pref and those below it won't be in the prefs.js file. I have run into that many times over the years where user.js didn't seem to work or stopped working partway thru the file; usually due to a mistype I made. but also when there was a major change to Firefox which invalidated or deprecated a pref that I had been using in any earlier version.

Also, why is this at the top? site-list = "internaldomain.com,sctwsgateway.internaldomain.com:8080,gateway:8080,gateway:8080";

If that is in your user.js file, at the top - that looks like the faulty pref, nothing below that would be read.

seems the user.js can't use variables. after adding the string manually to all the elements it's working.