diff -ruN seamonkey-2.53.14.old/dom/ipc/ContentChild.cpp seamonkey-2.53.14/dom/ipc/ContentChild.cpp
--- seamonkey-2.53.14.old/dom/ipc/ContentChild.cpp	2022-08-24 21:55:11.000000000 +0200
+++ seamonkey-2.53.14/dom/ipc/ContentChild.cpp	2022-09-29 15:01:51.098163074 +0200
@@ -210,7 +210,7 @@
 #include "mozilla/ipc/CrashReporterClient.h"
 #include "mozilla/net/NeckoMessageUtils.h"
 #include "mozilla/widget/PuppetBidiKeyboard.h"
-#include "mozilla/RemoteSpellCheckEngineChild.h"
+#include "mozilla/mozSpellChecker.h"
 #include "GMPServiceChild.h"
 #include "GfxInfoBase.h"
 #include "gfxPlatform.h"