nix-darwin-firefox.md

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let
  version = "71.0";

in

self: super: {
  firefox = with super; stdenv.mkDerivation rec {
    inherit version;
    
    name = "firefox-${version}";
    buildInputs = [ undmg unzip ];
    sourceRoot = ".";
    phases = [ "unpackPhase" "installPhase" ];
    installPhase = ''
      mkdir -p "$out/Applications"
      cp -r Firefox.app "$out/Applications/firefox.app"
      mkdir -p "$out/bin"
      cp -r "$out/Applications/firefox.app/Contents/MacOS/firefox" \
          "$out/bin/firefox"
    '';

    src = fetchurl {
      name = "firefox-${version}.dmg";
      url = "https://download-installer.cdn.mozilla.net/pub/firefox/releases/${version}/mac/en-GB/Firefox%20${version}.dmg";
      sha256 = "1kknqpsymh9jyvabhvg47bjgbazji7kpacxdvp9pb97gsv73fym8";
    };

    meta = with stdenv.lib; {
      description = "The Firefox web browser";
      homepage = https://www.mozilla.org/en-GB/firefox;
      maintainers = with maintainers; [ cmacrae ];
      platforms = platforms.darwin;
    };
  };
}

Results

The package builds and installs correctly using the following:

nixpkgs.overlays = [ (import ../overlays/firefox.nix) ];
programs.firefox.package = pkgs.firefox; # <- home-manager stuff

However, the resulting 'Applications/firefox.app' output differs from other darwin applications:

 π ~ ❯ ls -ld .nix-profile/Applications/*
lrwxr-xr-x  1 root  wheel  86  1 Jan  1970 .nix-profile/Applications/Alacritty.app -> /nix/store/f7ynz7hdkg824yf8dd37mcwh3wzagn7j-alacritty-0.4.0/Applications/Alacritty.app
lrwxr-xr-x  1 root  wheel  91  1 Jan  1970 .nix-profile/Applications/Emacs.app -> /nix/store/kj6g84msvvq1ij3s1j3wf25fwpw6jkl2-emacs-with-packages-26.3/Applications/Emacs.app
dr-xr-xr-x  3 root  wheel  96  1 Jan  1970 .nix-profile/Applications/firefox.app
lrwxr-xr-x  1 root  wheel  75  1 Jan  1970 .nix-profile/Applications/mpv.app -> /nix/store/qwdg60mda4bgw4nxf6yykllnrsyscb8n-mpv-0.30.0/Applications/mpv.app

As you can see... it's not a symlink.
When digging down into the contents, it seems that the files have the wrong permissions. For instance, the firefox binary isn't executable:

 π ~ ❯ ls -l $(readlink .nix-profile/Applications/firefox.app/Contents/MacOS/firefox)
-r--r--r--  1 root  wheel  36688  1 Jan  1970 /nix/store/cl8ajnznkldr8n20k01h25irrgfjzl7g-firefox-71.0/Applications/firefox.app/Contents/MacOS/firefox

cmacrae/nix-darwin-firefox.md Secret

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Results