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{phoenix, ...}: rec {
  phoenixOverlay = final: prev: {
    phoenix = (final.callPackage (import "${phoenix}/nix/package.nix")
      {
      }).overrideAttrs {
      patches = [
        ../../patches/0001-autoDisableScopes-unlocked.patch
      ];
    };
    withPhoenix = firefoxPackage:
      firefoxPackage.override {
        extraPoliciesFiles = ["${final.phoenix}/policies.json"];
        extraPrefsFiles = ["${final.phoenix}/phoenix.cfg"];
      };
  };
  phoenixModule = {
    pkgs,
    config,
    lib,
    ...
  }: {
    options.programs.firefox.phoenix = {
      enable =
        lib.mkEnableOption "Enable privacy & security hardening of Firefox using the Phoenix configs"
        // {
          default = true;
        };
      firefoxPackages = lib.mkOption {
        type = lib.types.listOf lib.types.str;
        default = ["firefox"];
        description = "The name of Firefox packages of current pkgs to patch with phoenix config and policy.";
      };
    };
    config = let
      cfg = config.programs.firefox.phoenix;
    in
      lib.mkIf cfg.enable {
        assertions = [
          {
            assertion = !pkgs.stdenv.isDarwin;
            message = "Phoenix module has not been ported to nix-darwin yet. Contributions welcomed.";
          }
        ];
        environment.etc."firefox/defaults/pref/phoenix-desktop.js".source = "${pkgs.phoenix}/pref/phoenix-desktop.js";
        environment.etc."firefox/phoenix/userjs".source = "${pkgs.phoenix}/userjs";
        environment.etc."firefox/phoenix/configs".source = "${pkgs.phoenix}/configs";
        environment.etc."firefox/phoenix/assets".source = "${pkgs.phoenix}/assets";
        programs.firefox.policies =
          (builtins.fromJSON (builtins.readFile "${pkgs.phoenix}/policies.json")).policies;
        nixpkgs.overlays = [
          phoenixOverlay
          (
            final: prev:
              builtins.listToAttrs (
                map (p: lib.nameValuePair p (final.withPhoenix prev.${p})) cfg.firefoxPackages
              )
          )
        ];
      };
  };
}