--- firefox-91.13.0/gfx/2d/Rect.h.old	2022-08-15 13:04:38.000000000 -0500
+++ firefox-91.13.0/gfx/2d/Rect.h	2024-05-28 20:50:50.230975904 -0500
@@ -15,6 +15,7 @@
 #include "mozilla/Maybe.h"
 
 #include <cmath>
+#include <cstdint>
 
 namespace mozilla {