anchor.diff:      url = "https://download.zotero.org/extension/zotero-${version}.xpi";
       sha256 = "02h2ja08v8as4fawj683rh5rmxsjf5d0qmvqa77i176nm20y5s7s";
     };
  +
  +  firefox' = stdenv.lib.overrideDerivation (firefox) (attrs: {
  +    patches = [ (fetchpatch {
  +      url = "https://hg.mozilla.org/releases/mozilla-beta/raw-rev/0558da46f20c";
  +      sha256 = "08ibp7hny78x8ywfvrh56z90kf8fjpf04mibdlrwkw4f1vgm3fc3";
  +      name = "fix-external-xpi-loader";
  +    }) ];
  +  });
   
     version = "4.0.28";
   
  
positive.code: { stdenv, fetchurl, bash, firefox, perl, unzipNLS, xorg }:
  
  let
  
  
negative.code: 
    nativeBuildInputs = [ perl unzipNLS ];
  
    inherit bash;
  
    firefox = firefox';
  
    phases = "unpackPhase installPhase fixupPhase";
  
  