diff --git a/mozilla/widget/macbuild/widget.xml b/mozilla/widget/macbuild/widget.xml
index e02f9b91def..ad614d7c270 100644
--- a/mozilla/widget/macbuild/widget.xml
+++ b/mozilla/widget/macbuild/widget.xml
@@ -3261,6 +3261,16 @@
                         <SETTING><NAME>FrameworkPath</NAME><VALUE>false</VALUE></SETTING>
                         <SETTING><NAME>HostFlags</NAME><VALUE>All</VALUE></SETTING>
                     </SETTING>
+                    <SETTING>
+                        <SETTING><NAME>SearchPath</NAME>
+                            <SETTING><NAME>Path</NAME><VALUE>:MacOS Support:(Third Party Support):Carbonized Menu Sharing:</VALUE></SETTING>
+                            <SETTING><NAME>PathFormat</NAME><VALUE>MacOS</VALUE></SETTING>
+                            <SETTING><NAME>PathRoot</NAME><VALUE>CodeWarrior</VALUE></SETTING>
+                        </SETTING>
+                        <SETTING><NAME>Recursive</NAME><VALUE>true</VALUE></SETTING>
+                        <SETTING><NAME>FrameworkPath</NAME><VALUE>false</VALUE></SETTING>
+                        <SETTING><NAME>HostFlags</NAME><VALUE>All</VALUE></SETTING>
+                    </SETTING>
                 </SETTING>
                 <SETTING><NAME>SystemSearchPaths</NAME>
                     <SETTING>
@@ -4444,6 +4454,13 @@
                     <FILEKIND>Library</FILEKIND>
                     <FILEFLAGS>Debug</FILEFLAGS>
                 </FILE>
+                <FILE>
+                    <PATHTYPE>Name</PATHTYPE>
+                    <PATH>MenuSharing.c</PATH>
+                    <PATHFORMAT>MacOS</PATHFORMAT>
+                    <FILEKIND>Text</FILEKIND>
+                    <FILEFLAGS>Debug</FILEFLAGS>
+                </FILE>
             </FILELIST>
             <LINKORDER>
                 <FILEREF>
@@ -4716,6 +4733,11 @@
                     <PATH>WidgetSupportDebug.shlb</PATH>
                     <PATHFORMAT>MacOS</PATHFORMAT>
                 </FILEREF>
+                <FILEREF>
+                    <PATHTYPE>Name</PATHTYPE>
+                    <PATH>MenuSharing.c</PATH>
+                    <PATHFORMAT>MacOS</PATHFORMAT>
+                </FILEREF>
             </LINKORDER>
         </TARGET>
         <TARGET>
@@ -4800,6 +4822,16 @@
                         <SETTING><NAME>FrameworkPath</NAME><VALUE>false</VALUE></SETTING>
                         <SETTING><NAME>HostFlags</NAME><VALUE>All</VALUE></SETTING>
                     </SETTING>
+                    <SETTING>
+                        <SETTING><NAME>SearchPath</NAME>
+                            <SETTING><NAME>Path</NAME><VALUE>:MacOS Support:(Third Party Support):Carbonized Menu Sharing:</VALUE></SETTING>
+                            <SETTING><NAME>PathFormat</NAME><VALUE>MacOS</VALUE></SETTING>
+                            <SETTING><NAME>PathRoot</NAME><VALUE>CodeWarrior</VALUE></SETTING>
+                        </SETTING>
+                        <SETTING><NAME>Recursive</NAME><VALUE>true</VALUE></SETTING>
+                        <SETTING><NAME>FrameworkPath</NAME><VALUE>false</VALUE></SETTING>
+                        <SETTING><NAME>HostFlags</NAME><VALUE>All</VALUE></SETTING>
+                    </SETTING>
                 </SETTING>
                 <SETTING><NAME>SystemSearchPaths</NAME>
                     <SETTING>
@@ -5983,6 +6015,13 @@
                     <FILEKIND>Library</FILEKIND>
                     <FILEFLAGS>Debug</FILEFLAGS>
                 </FILE>
+                <FILE>
+                    <PATHTYPE>Name</PATHTYPE>
+                    <PATH>MenuSharing.c</PATH>
+                    <PATHFORMAT>MacOS</PATHFORMAT>
+                    <FILEKIND>Text</FILEKIND>
+                    <FILEFLAGS>Debug</FILEFLAGS>
+                </FILE>
             </FILELIST>
             <LINKORDER>
                 <FILEREF>
@@ -6255,6 +6294,11 @@
                     <PATH>WidgetSupport.shlb</PATH>
                     <PATHFORMAT>MacOS</PATHFORMAT>
                 </FILEREF>
+                <FILEREF>
+                    <PATHTYPE>Name</PATHTYPE>
+                    <PATH>MenuSharing.c</PATH>
+                    <PATHFORMAT>MacOS</PATHFORMAT>
+                </FILEREF>
             </LINKORDER>
         </TARGET>
     </TARGETLIST>
@@ -6311,6 +6355,12 @@
                     <PATH>nsTSMStrategy.cpp</PATH>
                     <PATHFORMAT>MacOS</PATHFORMAT>
                 </FILEREF>
+                <FILEREF>
+                    <TARGETNAME>widgetCarbonDebug.shlb</TARGETNAME>
+                    <PATHTYPE>Name</PATHTYPE>
+                    <PATH>MenuSharing.c</PATH>
+                    <PATHFORMAT>MacOS</PATHFORMAT>
+                </FILEREF>
             </GROUP>
             <GROUP><NAME>Mac Apps</NAME>
                 <FILEREF>
diff --git a/mozilla/widget/src/mac/nsMacMessagePump.cpp b/mozilla/widget/src/mac/nsMacMessagePump.cpp
index 9de9fb17750..454cc9b9cd8 100644
--- a/mozilla/widget/src/mac/nsMacMessagePump.cpp
+++ b/mozilla/widget/src/mac/nsMacMessagePump.cpp
@@ -86,6 +86,9 @@
 #include "nsISocketTransportService.h"
 #include "nsIFileTransportService.h"
 
+#if TARGET_CARBON && !XP_MACOSX
+#include "MenuSharing.h"
+#endif
 
 #ifndef topLeft
 #define topLeft(r)  (((Point *) &(r))[0])
@@ -189,6 +192,22 @@ static long ConvertOSMenuResultToPPMenuResult(long menuResult)
 }
 
 #pragma mark -
+#if TARGET_CARBON && !XP_MACOSX
+#pragma mark MenuSharingToolkitSupport
+//=================================================================
+static pascal void ErrorDialog (Str255 s)
+{
+  //ParamText (s, "\p", "\p", "\p"); 
+  //Alert (kMenuSharingAlertID, nil);
+}
+	
+//=================================================================
+static pascal void EventFilter (EventRecord *ev)
+{
+  // Hrm, prolly should do _something_ here
+}
+#pragma mark -
+#endif
 
 static NS_DEFINE_CID(kEventQueueServiceCID, NS_EVENTQUEUESERVICE_CID);
 
@@ -214,6 +233,11 @@ nsMacMessagePump::nsMacMessagePump(nsToolkit *aToolkit)
 
   // startup the watch cursor idle time vbl task
   nsWatchTask::GetTask().Start();
+
+#if TARGET_CARBON && !XP_MACOSX
+  // added to support Menu Sharing API.  Initializes the Menu Sharing API.
+  InitSharedMenus (ErrorDialog, EventFilter);
+#endif
 }
 
 //=================================================================
@@ -983,6 +1007,14 @@ void  nsMacMessagePump::DoIdle(EventRecord &anEvent)
   // send mouseMove event
   static Point  lastWhere = {0, 0};
 
+#if TARGET_CARBON && !XP_MACOSX
+  if ( nsToolkit::IsAppInForeground() )
+  {
+    // Shared Menu support - note we hardcode first menu ID available as 31000
+    CheckSharedMenus(31000);
+  }
+#endif    
+
   if (*(long*)&lastWhere == *(long*)&anEvent.where)
     return;
 
diff --git a/mozilla/widget/src/mac/nsMenuBarX.cpp b/mozilla/widget/src/mac/nsMenuBarX.cpp
index 063a480edcf..e0dc8559f64 100644
--- a/mozilla/widget/src/mac/nsMenuBarX.cpp
+++ b/mozilla/widget/src/mac/nsMenuBarX.cpp
@@ -70,6 +70,10 @@
 
 #include "nsGUIEvent.h"
 
+#if !XP_MACOSX
+#include "MenuSharing.h"
+#endif
+
 // CIDs
 #include "nsWidgetsCID.h"
 static NS_DEFINE_CID(kMenuBarCID, NS_MENUBAR_CID);
@@ -351,6 +355,20 @@ nsMenuBarX :: CommandEventHandler ( EventHandlerCallRef inHandlerChain, EventRef
           break;
         }
 
+#if !XP_MACOSX
+        case 'SHMN':
+        { // Shared menu support
+          MenuItemIndex index = command.menu.menuItemIndex;
+          if (index)
+          {
+            (void)SharedMenuHit(GetMenuID(command.menu.menuRef), command.menu.menuItemIndex);
+            ::HiliteMenu(0);
+            handled = noErr;
+          }
+          break;
+        }
+#endif
+
         default:
         {
           // given the commandID, look it up in our hashtable and dispatch to