As with many other packages, on NixOS you have to enable the relevant option: https://search.nixos.org/options?show=programs.ladybird.enable&query=ladybird http

As with many other packages, on NixOS you have to enable the relevant option: https://search.nixos.org/options?show=programs.ladybird.enable&query=ladybird https://search.nixos.org/options?show=programs.ladybird.enab... If that doesn't work, please open an issue in the nixpkgs bug tracker.