diff --git a/mozilla/widget/src/mac/nsMacMessageSink.h b/mozilla/widget/src/mac/nsMacMessageSink.h
index 887cc594d8a..1a3e250e091 100644
--- a/mozilla/widget/src/mac/nsMacMessageSink.h
+++ b/mozilla/widget/src/mac/nsMacMessageSink.h
@@ -20,6 +20,34 @@
 #define nsMacMessageSink_h__
 
 #include "prtypes.h"
+class nsMacWindow;
+
+
+/*================================================
+¥¥¥IMPORTANT
+Hacks to make Raptor coexist with other windows.
+================================================*/
+
+// This bit is set in the Raptor windows 'windowKind'
+#define kRaptorWindowKindBit		0x4000
+
+
+// An nsRefData pointer is stored in the Raptor windows 'refCon'
+class nsRefData
+{
+protected:
+	nsMacWindow*	mNSMacWindow;			// The nsMacWindow, ie. the top level widget
+	long					mUserData;				// Embedding applications data, guaranteed not to be used by widget code
+
+public:
+	nsMacWindow*	GetNSMacWindow()	{return(mNSMacWindow);}
+	long					GetUserData()			{return(mUserData);}
+
+	void					SetNSMacWindow(nsMacWindow* aNSMacWindow)	{mNSMacWindow = aNSMacWindow;}
+	void					SetUserData(long aUserData)								{mUserData = aUserData;}
+};
+
+
 
 /*================================================
 ¥¥¥IMPORTANT
@@ -42,6 +70,5 @@ public:
 };
 
 
-
 #endif // nsMacMessageSink_h__