9c53116d49
This reverts commit 67c8c4917799496dcf2ad6a500441fbbaeb918c9. 'nix run nixos.firefox' is *not* supposed to work - the Nix 2.x interface attempts to standardize on nixpkgs.*, to get rid of the nixos/nixpkgs confusion that existed with the channels interface. So let's not bring that confusion back.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.