anchor.diff:  { stdenv, fetchFromGitHub, makeDesktopItem
   , pkgconfig, autoconf213, alsaLib, bzip2, cairo
   , dbus, dbus-glib, file, fontconfig, freetype
  -, gstreamer, gst-plugins-base, gst_all_1
  +, gnome2, gnum4, gstreamer, gst-plugins-base, gst_all_1
   , gtk2, hunspell, icu, libevent, libjpeg, libnotify
   , libstartup_notification, libvpx, makeWrapper, libGLU_combined
   , nspr, nss, pango, perl, python, libpulseaudio, sqlite
  -, unzip, xorg, which, yasm, zip, zlib
  +, unzip, xorg, wget, which, yasm, zip, zlib
   }:
   
   stdenv.mkDerivation rec {
  -  name = "palemoon-${version}";
  -  version = "27.9.4";
  +  pname = "palemoon";
  +  version = "28.6.0.1";
   
     src = fetchFromGitHub {
  -    name   = "palemoon-src";
  +    name   = "${pname}-${version}";
       owner  = "MoonchildProductions";
  -    repo   = "Pale-Moon";
  -    rev    = version + "_Release";
  -    sha256 = "0ir5gzhw98gfn15x58g1fwi11jd7gysvacqxg1v0jdjhgdl4m5sx";
  +    repo   = "UXP";
  +    rev    = "PM${version}_Release";
  +    sha256 = "1adgajy5vsghvjlv2nqyrbp6mnv3k6slqxxi8r949xlb5h6d210b";
     };
   
     desktopItem = makeDesktopItem {
  
positive.code: 
    buildInputs = [
      alsaLib bzip2 cairo dbus dbus-glib file fontconfig freetype
      gst-plugins-base gstreamer gst_all_1.gst-plugins-base gtk2
      hunspell icu libevent libjpeg libnotify libstartup_notification
      libvpx makeWrapper libGLU_combined nspr nss pango perl pkgconfig python
      libpulseaudio sqlite unzip which yasm zip zlib
    ] ++ (with xorg; [
      libX11 libXext libXft libXi libXrender libXScrnSaver
      libXt pixman xorgproto
  
negative.code:   enableParallelBuilding = true;
  
    configurePhase = ''
      export MOZBUILD_STATE_PATH=$(pwd)/mozbuild
      export MOZCONFIG=$(pwd)/mozconfig
      export builddir=$(pwd)/pmbuild
  
      echo > $MOZCONFIG "
      mk_add_options AUTOCLOBBER=1
      mk_add_options MOZ_OBJDIR=$builddir
      ac_add_options --enable-application=palemoon
  
      ac_add_options --enable-optimize='-O2'
  
      # Please see https://www.palemoon.org/redist.shtml for restrictions when using the official branding.
      ac_add_options --enable-official-branding
      export MOZILLA_OFFICIAL=1
  
      ac_add_options --enable-default-toolkit=cairo-gtk2
      ac_add_options --enable-jemalloc
      ac_add_options --enable-strip
      ac_add_options --with-pthreads
  
      ac_add_options --disable-tests
      ac_add_options --disable-eme
      ac_add_options --disable-parental-controls
      ac_add_options --disable-accessibility
      ac_add_options --disable-webrtc
      ac_add_options --disable-gamepad
      ac_add_options --disable-necko-wifi
      ac_add_options --disable-updater
  
      ac_add_options --x-libraries=${xorg.libX11.out}/lib
  
      ac_add_options --prefix=$out
      mk_add_options MOZ_MAKE_FLAGS='-j$NIX_BUILD_CORES'
      mk_add_options AUTOCONF=${autoconf213}/bin/autoconf
      "
    '';
  
    hardeningDisable = [ "format" ];
  
    buildPhase = ''
      $src/mach build
    '';
  
    installPhase = ''
      $src/mach install
  
      mkdir -p $out/share/applications
      cp ${desktopItem}/share/applications/* $out/share/applications
  
      for n in 16 22 24 32 48 256; do
        size=$n"x"$n
        mkdir -p $out/share/icons/hicolor/$size/apps
        cp $src/application/palemoon/branding/official/default$n.png \
           $out/share/icons/hicolor/$size/apps/palemoon.png
      done
    '';
  
    meta = with stdenv.lib; {
      description = "An Open Source, Goanna-based web browser focusing on efficiency and customization";
      longDescription = ''
        Pale Moon is an Open Source, Goanna-based web browser focusing on
        efficiency and customization.
  