Those proxy setting must come from the site your logging into FF doesn't provide Proxy support.

I had FF on thousands of machines. I need to set this setting on them, there is a GP admx template but it just doesn't seem to allow me to save the settings I need.

This looks like an issue with the Socks version that shows as empty (not defined) in the screenshot. The help text at the right suggests that this field can't be empty.

The SOCKS drop down, whatever that is. has 2 options if I use either it still won't let me save it. Says missing value