$ cat /etc/portage/patches/www-client/firefox/missing-stdint.h 
--- a/xpcom/base/nsVersionComparator.h	2026-02-16 13:37:51.000000000 -0500
+++ b/xpcom/base/nsVersionComparator.h	2026-02-28 06:44:50.529920953 -0500
@@ -10,6 +10,7 @@
 #ifndef nsVersionComparator_h__
 #define nsVersionComparator_h__
 
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>