A NixOS Module (and maybe a flake) to configure the browser.
it would make nixos users very happy because there are (to my knownledge) no browsers that have a good way to manage the browser config through a nixos module.
also an option to disable configuration options in the gui would be cool (this might sound useless and nonsensical but its annoying when you change your browser settings outside of your config and your config breaks when porting it to another device)