network.automatic-ntlm-auth.trusted-uris: Add entries and do not overwrite them

[kyndadumb]

The option of being able to add rather than overwrite all entries for users with this policy would be nice. Is that possible?

[mkaply]

I'm curious what the usecase is? Most people wouldn't have modified this preference in about:config. They would rely on someone telling them what to put there.

[kyndadumb]

Our use case is that we have some entries there that are user-specific and do not need to be distributed to every user within the organization (local systems that use NTML-Auth).
If there was an option to append the organization-wide URIs the configuration effort for us would be minimized and the entries would be shorter as we would not have to include every local system to keep the authentication functional for each local system.

[mkaply]

So I'm thinking about this more and wondering if I can update the Preferences policy to do this.

On your users machine, are the trusted-uri values set as user preferences or default preferences (how are they set in the first place).

I'm considering adding support for preferences to append to existing preferences, but I need to know if this only applies for user preferences or I need it for default preferences as well.

There's no easy way to add this to the Authentication policies.