diff --git a/srcpkgs/slimerjs/patches/gecko-40.patch b/srcpkgs/slimerjs/patches/gecko-40.patch
deleted file mode 100644
index f831afc8461..00000000000
--- a/srcpkgs/slimerjs/patches/gecko-40.patch
+++ /dev/null
@@ -1,51 +0,0 @@
-From 1668cb41f53ed2bad116a876f615fe133e7fb314 Mon Sep 17 00:00:00 2001
-From: =?UTF-8?q?Jerry=20Lundstr=C3=B6m?= <lundstrom.jerry@gmail.com>
-Date: Wed, 12 Aug 2015 11:07:25 +0200
-Subject: [PATCH] Update supported Gecko version to 40.*. Fix 'Sandbox must
- subsume sandboxPrototype' error by supplying the content window as prototype
- if the Gecko version is 40 or above.
-
----
- src/application.ini        |  2 +-
- src/modules/slLauncher.jsm | 11 ++++++++---
- 2 files changed, 9 insertions(+), 4 deletions(-)
-
-diff --git a/src/application.ini b/src/application.ini
-index 46f151a..4fb267b 100644
---- src/application.ini
-+++ src/application.ini
-@@ -8,4 +8,4 @@ Copyright=Copyright 2012-2015 Laurent Jouanneau & Innophi
- 
- [Gecko]
- MinVersion=17.0.0
--MaxVersion=39.*
-+MaxVersion=40.*
-diff --git a/src/modules/slLauncher.jsm b/src/modules/slLauncher.jsm
-index e49e811..72e4004 100644
---- src/modules/slLauncher.jsm
-+++ src/modules/slLauncher.jsm
-@@ -22,6 +22,10 @@ const fileHandler = Cc["@mozilla.org/network/protocol;1?name=file"]
-                      .getService(Ci.nsIFileProtocolHandler)
- const systemPrincipal = Cc['@mozilla.org/systemprincipal;1']
-                         .createInstance(Ci.nsIPrincipal)
-+const appInfo = Cc["@mozilla.org/xre/app-info;1"]
-+                .getService(Ci.nsIXULAppInfo);
-+const versionComparator = Cc["@mozilla.org/xpcom/version-comparator;1"]
-+                          .getService(Ci.nsIVersionComparator);
- 
- /**
-  * this function retrieves various informations
-@@ -92,9 +96,10 @@ var slLauncher = {
-             // prepare the sandbox to execute coffee script injected with injectJs
-             coffeeScriptSandbox = Cu.Sandbox(contentWindow,
-                                 {
--                                    'sandboxName': 'coffeescript',
--                                    'sandboxPrototype': {},
--                                    'wantXrays': true
-+                                    sandboxName: 'coffeescript',
-+                                    // XULrunner 40.0 and above handles sandboxPrototype different then before
-+                                    sandboxPrototype: versionComparator.compare(appInfo.platformVersion, '40') < 0 ? {} : contentWindow,
-+                                    wantXrays: true
-                                 });
-             let src = slUtils.readChromeFile("resource://slimerjs/coffee-script/extras/coffee-script.js");
-             Cu.evalInSandbox('var CoffeeScript;', coffeeScriptSandbox, 'ECMAv5', 'slLauncher::launchMainScript', 1);
diff --git a/srcpkgs/slimerjs/template b/srcpkgs/slimerjs/template
index d9f7e3e867e..824614a9aab 100644
--- a/srcpkgs/slimerjs/template
+++ b/srcpkgs/slimerjs/template
@@ -5,7 +5,7 @@ revision=2
 noarch=yes
 wrksrc=$pkgname-RELEASE_$version
 hostmakedepends="zip"
-depends="bash firefox<41"
+depends="bash firefox-esr<40"
 short_desc="A scriptable browser for Firefox"
 maintainer="Eivind Uggedal <eivind@uggedal.com>"
 license="MPL-2.0, BSD"