Enable NTLM SSO in Firefox via Group Policy

I would like to enable NTLM for a specific intranet site. For that I need to configure the following parameter:

network.automatic-ntlm-auth.trusted-uris to add x.xyz.com

How can I achieve this via group policy for Firefox Users?

I've come across this script (below) but unsure if this is the best solution

https://www.felixrr.pro/wp-content/uploads/2012/05/FirefoxSSO.txt

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