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

rec {
  firefox = firefoxCommon rec {
    pname = "firefox";
    ffversion = "81.0";
    src = fetchurl {
      url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
      sha512 = "1dnxn754vb99mccqrj3wr3pg2scjy42rvs5xc6bw022gh6n8kgipx9pbkapwfivkglynxmmbw1k11ak34zhr1g6p31m3550ad6azq19";
    };

    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 = firefoxCommon rec {
    pname = "firefox-esr";
    ffversion = "78.3.0esr";
    src = fetchurl {
      url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
      sha512 = "3rg4rjmigir2wsvzdl5dkh74hahjv36yvd04rhq0rszw6xz9wyig64nxhkrpf416z6iy3y1qavk7x9j6j02sc2f545pd6cx8abjgqc9";
    };

    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";
    };
  };

  firefox-beta = firefoxCommon rec {
    pname = "firefox";
    ffversion = "66.0b5";
    src = fetchurl {
      url = "mirror://mozilla/firefox/releases/${ffversion}/source/firefox-${ffversion}.source.tar.xz";
      sha512 = "2cnv8pnl220dxqfpcdnwibwidc8b9zg3bj9wkzc83r4cdsfcjy3hqyw01gpc30a4qwbbabsgask3hl3dg7d3d8qqw4c588b00z67mvs";
    };

    patches = [
      ./no-buildconfig-ffx65.patch
    ];

    meta = firefox.meta // {
      description = "A web browser built from Firefox Beta source tree";
    };
    updateScript = callPackage ./update.nix {
      attrPath = "firefox-beta";
      versionKey = "ffversion";
    };
  };

}