

I think you want a skeleton. /etc/skel
If you want to copy settings for Firefox and other applications, copy (parts of) your .config in there. When you create a new user it uses the skel directory as a template.
Google/GPT will explain it better than I can.







My two most popular public game servers are Necesse and Rimworld Together. Neither have many public servers.
https://github.com/RimWorld-Together/Rimworld-Together
https://store.steampowered.com/app/1169040/Necesse/