diff --git a/pkgs/build-support/build-mozilla-mach/136-no-buildconfig.patch b/pkgs/build-support/build-mozilla-mach/136-no-buildconfig.patch
new file mode 100644
index 000000000000..69972b5518bb
--- /dev/null
+++ b/pkgs/build-support/build-mozilla-mach/136-no-buildconfig.patch
@@ -0,0 +1,26 @@
+diff --git a/docshell/base/nsAboutRedirector.cpp b/docshell/base/nsAboutRedirector.cpp
+index 16888323d7..b96450a247 100644
+--- a/docshell/base/nsAboutRedirector.cpp
++++ b/docshell/base/nsAboutRedirector.cpp
+@@ -90,9 +90,6 @@ static const RedirEntry kRedirMap[] = {
+     {"addons", "chrome://mozapps/content/extensions/aboutaddons.html",
+      nsIAboutModule::ALLOW_SCRIPT | nsIAboutModule::IS_SECURE_CHROME_UI},
+ #endif
+-    {"buildconfig", "chrome://global/content/buildconfig.html",
+-     nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT |
+-         nsIAboutModule::IS_SECURE_CHROME_UI},
+     {"checkerboard", "chrome://global/content/aboutCheckerboard.html",
+      nsIAboutModule::URI_SAFE_FOR_UNTRUSTED_CONTENT |
+          nsIAboutModule::ALLOW_SCRIPT},
+diff --git a/toolkit/content/jar.mn b/toolkit/content/jar.mn
+index eb6c179b60..57568668b1 100644
+--- a/toolkit/content/jar.mn
++++ b/toolkit/content/jar.mn
+@@ -40,7 +40,6 @@ toolkit.jar:
+    content/global/aboutUrlClassifier.js
+    content/global/aboutUrlClassifier.xhtml
+    content/global/aboutUrlClassifier.css
+-*   content/global/buildconfig.html
+    content/global/buildconfig.css
+    content/global/contentAreaUtils.js
+    content/global/datepicker.xhtml
diff --git a/pkgs/build-support/build-mozilla-mach/default.nix b/pkgs/build-support/build-mozilla-mach/default.nix
index 8afe2e434322..043fc8ec537d 100644
--- a/pkgs/build-support/build-mozilla-mach/default.nix
+++ b/pkgs/build-support/build-mozilla-mach/default.nix
@@ -305,7 +305,8 @@ buildStdenv.mkDerivation {
   ];
 
   patches =
-    lib.optionals (lib.versionAtLeast version "139" && lib.versionOlder version "141") [
+    lib.optionals (lib.versionAtLeast version "136") [ ./136-no-buildconfig.patch ]
+    ++ lib.optionals (lib.versionAtLeast version "139" && lib.versionOlder version "141") [
       # https://bugzilla.mozilla.org/show_bug.cgi?id=1955112
       # https://hg-edge.mozilla.org/mozilla-central/rev/aa8a29bd1fb9
       ./139-wayland-drag-animation.patch