{ config, stdenv, lib, callPackage, fetchurl, nss_3_44 }:

let
  common = opts: callPackage (import ./common.nix opts) {};
in

rec {
  firefox = common rec {
    pname = "firefox";
    ffversion = "81.0.2";
    src = fetchurl {
      url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
      sha512 = "1szsj7rwpn7ggiavvnc38a75ip0r3p5bgr2kvy2hq7519abzmr3z49jg4alpsy1ndkfylvh28zjw9h5xys0bvs40f33ps90j60z8gla";
    };

    patches = [
      ./no-buildconfig-ffx76.patch
    ];

    meta = {
      description = "A web browser built from Firefox source tree";
      homepage = "http://www.mozilla.com/en-US/firefox/";
      maintainers = with lib.maintainers; [ eelco andir ];
      platforms = lib.platforms.unix;
      badPlatforms = lib.platforms.darwin;
      broken = stdenv.buildPlatform.is32bit; # since Firefox 60, build on 32-bit platforms fails with "out of memory".
                                             # not in `badPlatforms` because cross-compilation on 64-bit machine might work.
      license = lib.licenses.mpl20;
      timeout = 28800; # eight hours
    };
    updateScript = callPackage ./update.nix {
      attrPath = "firefox-unwrapped";
      versionKey = "ffversion";
    };
  };

  firefox-esr-78 = common rec {
    pname = "firefox-esr";
    ffversion = "78.3.1esr";
    src = fetchurl {
      url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
      sha512 = "10a7xfp396n81aj17fbl1b1jr8gbn5ild2ig5cfz6r5ff3wfbjs3x0iqrlwqnjfdqq2pw19k2yrv91iwymd8jwjj4p35xsfivgn0a0n";
    };

    patches = [
      ./no-buildconfig-ffx76.patch
    ];

    meta = {
      description = "A web browser built from Firefox Extended Support Release source tree";
      homepage = "http://www.mozilla.com/en-US/firefox/";
      maintainers = with lib.maintainers; [ eelco andir ];
      platforms = lib.platforms.unix;
      badPlatforms = lib.platforms.darwin;
      broken = stdenv.buildPlatform.is32bit; # since Firefox 60, build on 32-bit platforms fails with "out of memory".
                                             # not in `badPlatforms` because cross-compilation on 64-bit machine might work.
      license = lib.licenses.mpl20;
    };
    updateScript = callPackage ./update.nix {
      attrPath = "firefox-esr-78-unwrapped";
      versionKey = "ffversion";
    };
  };
}