{pkgs ? import <nixpkgs>, ...}: let
  name = "beta";

  variant =
    {
      beta.x86_64-linux = rec {
        version = "1.7.4b";
        sha1 = "5259fa7cbd661f137c5a84d34e48882074a1a20e";
        url = "https://github.com/zen-browser/desktop/releases/download/${version}/zen.linux-x86_64.tar.bz2";
        sha256 = "sha256-hiGb2oyAueKa6Xs6BvtEmgPTRlOXvJ5YDseS8kZ1VbQ=";
      };
      beta.aarch64-linux = rec {
        version = "1.7.4b";
        sha1 = "5259fa7cbd661f137c5a84d34e48882074a1a20e";
        url = "https://github.com/zen-browser/desktop/releases/download/${version}/zen.linux-aarch64.tar.bz2";
        sha256 = "sha256-/fdgw97Ocg7AYGchHhXSWhFOS0bMb5GVAgZDw6/yh3I=";
      };
    }
    .${name}
    .${pkgs.system};

  runtimeLibs = with pkgs;
    [
      libGL
      libGLU
      libevent
      libffi
      libjpeg
      libpng
      libstartup_notification
      libvpx
      libwebp
      stdenv.cc.cc
      fontconfig
      libxkbcommon
      zlib
      freetype
      gtk3
      libxml2
      dbus
      xcb-util-cursor
      alsa-lib
      libpulseaudio
      pango
      atk
      cairo
      gdk-pixbuf
      glib
      udev
      libva
      mesa
      libnotify
      cups
      pciutils
      ffmpeg
      libglvnd
      pipewire
      speechd
    ]
    ++ (with pkgs.xorg; [
      libxcb
      libX11
      libXcursor
      libXrandr
      libXi
      libXext
      libXcomposite
      libXdamage
      libXfixes
      libXScrnSaver
    ]);

  policiesJson = pkgs.writeText "firefox-policies.json" (builtins.toJSON {
    # https://mozilla.github.io/policy-templates/#disableappupdates
    policies = {
      DisableAppUpdate = true;
    };
  });

  desktopFile =
    if name == "beta"
    then "zen.desktop"
    else "zen_${name}.desktop";
in
  pkgs.stdenv.mkDerivation {
    inherit (variant) version;

    pname = "zen-browser";

    src = builtins.fetchTarball {inherit (variant) url sha256;};
    desktopSrc = ./.;

    phases = ["installPhase" "fixupPhase"];

    nativeBuildInputs = with pkgs; [makeWrapper copyDesktopItems wrapGAppsHook];

    installPhase = ''
      mkdir -p $out/{bin,opt/zen,lib/zen-${variant.version}/distribution} && cp -r $src/* $out/opt/zen
      ln -s $out/opt/zen/zen $out/bin/zen
      ln -s ${policiesJson} "$out/lib/zen-${variant.version}/distribution/policies.json"
      ln -s $out/bin/zen $out/bin/zen-${name}

      install -D $desktopSrc/zen-${name}.desktop $out/share/applications/${desktopFile}

      install -D $src/browser/chrome/icons/default/default16.png $out/share/icons/hicolor/16x16/apps/zen-${name}.png
      install -D $src/browser/chrome/icons/default/default32.png $out/share/icons/hicolor/32x32/apps/zen-${name}.png
      install -D $src/browser/chrome/icons/default/default48.png $out/share/icons/hicolor/48x48/apps/zen-${name}.png
      install -D $src/browser/chrome/icons/default/default64.png $out/share/icons/hicolor/64x64/apps/zen-${name}.png
      install -D $src/browser/chrome/icons/default/default128.png $out/share/icons/hicolor/128x128/apps/zen-${name}.png
    '';

    fixupPhase = ''
      chmod 755 $out/bin/zen $out/opt/zen/*

      patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" $out/opt/zen/zen
      wrapProgram $out/opt/zen/zen --set LD_LIBRARY_PATH "${
        pkgs.lib.makeLibraryPath runtimeLibs
      }" \
                           --set MOZ_LEGACY_PROFILES 1 --set MOZ_ALLOW_DOWNGRADE 1 --set MOZ_APP_LAUNCHER zen --prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH"

      patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" $out/opt/zen/zen-bin
           wrapProgram $out/opt/zen/zen-bin --set LD_LIBRARY_PATH "${
        pkgs.lib.makeLibraryPath runtimeLibs
      }" \
                           --set MOZ_LEGACY_PROFILES 1 --set MOZ_ALLOW_DOWNGRADE 1 --set MOZ_APP_LAUNCHER zen --prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH"

      patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" $out/opt/zen/glxtest
           wrapProgram $out/opt/zen/glxtest --set LD_LIBRARY_PATH "${
        pkgs.lib.makeLibraryPath runtimeLibs
      }"

      patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" $out/opt/zen/updater
           wrapProgram $out/opt/zen/updater --set LD_LIBRARY_PATH "${
        pkgs.lib.makeLibraryPath runtimeLibs
      }"

      patchelf --set-interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" $out/opt/zen/vaapitest
           wrapProgram $out/opt/zen/vaapitest --set LD_LIBRARY_PATH "${
        pkgs.lib.makeLibraryPath runtimeLibs
      }"
    '';

    meta = {
      inherit desktopFile;

      description = "Experience tranquillity while browsing the web without people tracking you!";
      homepage = "https://zen-browser.app";
      downloadPage = "https://zen-browser.app/download/";
      changelog = "https://github.com/zen-browser/desktop/releases";
      platforms = pkgs.lib.platforms.linux;
      mainProgram = "zen";
    };
  }