diff --git a/pkgs/applications/office/zotero/default.nix b/pkgs/applications/office/zotero/default.nix
index 5939478d695f..d74e1ac4b7c8 100644
--- a/pkgs/applications/office/zotero/default.nix
+++ b/pkgs/applications/office/zotero/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, fetchpatch, bash, firefox, perl, unzipNLS, xorg }:
+{ stdenv, fetchurl, bash, firefox, perl, unzipNLS, xorg }:
 
 let
 
@@ -7,14 +7,6 @@ let
     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";
 
 in
@@ -29,9 +21,7 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = [ perl unzipNLS ];
 
-  inherit bash;
-
-  firefox = firefox';
+  inherit bash firefox;
 
   phases = "unpackPhase installPhase fixupPhase";