let
pkgs = import <nixpkgs> {};
overlay = pkgs.fetchFromGitHub {
owner = "mozilla";
repo = "nixpkgs-mozilla";
rev = "efda5b357451dbb0431f983cca679ae3cd9b9829";
sha256 = "11wqrg86g3qva67vnk81ynvqyfj0zxk83cbrf0p9hsvxiwxs8469";
};
in
import overlay