diff --git a/src/firefox-patches/ff139-sandbox-missing-header.patch b/src/firefox-patches/ff139-sandbox-missing-header.patch
new file mode 100644
index 00000000..caec6c8c
--- /dev/null
+++ b/src/firefox-patches/ff139-sandbox-missing-header.patch
@@ -0,0 +1,32 @@
+
+# HG changeset patch
+# User Julian Descottes <jdescottes@mozilla.com>
+# Date 1744201993 0
+# Node ID 2e2d932d75c44447af89224be5e4324dc080c447
+# Parent  9f134a1b1a884a857c59517ba0e8f3603e4009dd
+Bug 1959377 - Include vector in mac/Sandbox.h to fix build on macos 15.4 r=emilio
+
+Differential Revision: https://phabricator.services.mozilla.com/D244870
+
+diff --git a/security/sandbox/mac/Sandbox.h b/security/sandbox/mac/Sandbox.h
+--- a/security/sandbox/mac/Sandbox.h
++++ b/security/sandbox/mac/Sandbox.h
+@@ -2,16 +2,17 @@
+ /* This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+ 
+ #ifndef mozilla_Sandbox_h
+ #define mozilla_Sandbox_h
+ 
+ #include <string>
++#include <vector>
+ #include "mozilla/ipc/UtilityProcessSandboxing.h"
+ 
+ enum MacSandboxType {
+   MacSandboxType_Default = 0,
+   MacSandboxType_Content,
+   MacSandboxType_GMP,
+   MacSandboxType_RDD,
+   MacSandboxType_Socket,
+