diff --git a/content/xbl/src/nsXBLEventHandler.cpp b/content/xbl/src/nsXBLEventHandler.cpp
index ca2af0ebb3f7..6db39a2fd2b7 100644
--- a/content/xbl/src/nsXBLEventHandler.cpp
+++ b/content/xbl/src/nsXBLEventHandler.cpp
@@ -45,6 +45,10 @@
 #include "nsIDOMEventReceiver.h"
 #include "nsXBLBinding.h"
 #include "nsIPrivateDOMEvent.h"
+#include "nsIPref.h"
+#include "nsIServiceManager.h"
+
+static NS_DEFINE_CID(kPrefServiceCID, NS_PREF_CID);
 
 PRUint32 nsXBLEventHandler::gRefCnt = 0;
 nsIAtom* nsXBLEventHandler::kKeyCodeAtom = nsnull;
@@ -71,6 +75,7 @@ nsXBLEventHandler::nsXBLEventHandler(nsIContent* aBoundElement, nsIContent* aHan
   mEventName.Assign(aEventName);
   mNextHandler = nsnull;
   gRefCnt++;
+  mAccessKey = -1;
   if (gRefCnt == 1) {
     kKeyCodeAtom = NS_NewAtom("keycode");
     kKeyAtom = NS_NewAtom("key");
@@ -371,7 +376,38 @@ nsresult nsXBLEventHandler::Destroy(nsIDOMEvent* aEvent)
   return NS_OK;
 }
 
-///////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////////
+// Get the menu access key from prefs.
+// XXX Eventually pick up using CSS3 key-equivalent property or somesuch
+void
+nsXBLEventHandler::InitAccessKey()
+{
+  if (mAccessKey >= 0)
+    return;
+
+  // Compiled-in defaults, in case we can't get the pref --
+  // mac doesn't have menu shortcuts, other platforms use alt.
+#ifndef XP_MAC
+  mAccessKey = nsIDOMKeyEvent::DOM_VK_ALT;
+#else
+  mAccessKey = 0;
+#endif
+
+  // Get the menu access key value from prefs, overriding the default:
+  nsresult rv;
+  NS_WITH_SERVICE(nsIPref, prefs, NS_PREF_PROGID, &rv);
+  if (NS_SUCCEEDED(rv) && prefs)
+  {
+    rv = prefs->GetIntPref("ui.key.menuAccessKey", &mAccessKey);
+  }
+#ifdef DEBUG_akkana
+  if (NS_FAILED(rv))
+  {
+    NS_ASSERTION(PR_FALSE,"XBLEventHandler couldn't get menu access key from prefs!\n");
+  }
+#endif
+}
+
 
 PRBool 
 nsXBLEventHandler::KeyEventMatched(nsIDOMKeyEvent* aKeyEvent)
@@ -409,31 +445,31 @@ nsXBLEventHandler::KeyEventMatched(nsIDOMKeyEvent* aKeyEvent)
 
   // Now check modifier keys
   nsAutoString modifier;
-  PRBool isModifierPresent;
   mHandlerElement->GetAttribute(kNameSpaceID_None, kPrimaryAtom, modifier);
-  if (modifier == trueString) {
-    // The XUL key must be set.  Hard code for now.
-    // XXX Eventually pick up using CSS3 key-equivalent property or somesuch
-#ifdef XP_MAC
-    aKeyEvent->GetMetaKey(&isModifierPresent);
-#elif XP_UNIX
-    aKeyEvent->GetAltKey(&isModifierPresent);
-#else
-    aKeyEvent->GetCtrlKey(&isModifierPresent);
-#endif
 
+  // Get the xulkey.
+  InitAccessKey();
+  PRBool isModifierPresent = PR_FALSE;
+  switch (mAccessKey)
+  {
+    case nsIDOMKeyEvent::DOM_VK_META:
+      aKeyEvent->GetMetaKey(&isModifierPresent);
+      break;
+
+    case nsIDOMKeyEvent::DOM_VK_ALT:
+      aKeyEvent->GetAltKey(&isModifierPresent);
+      break;
+
+    case nsIDOMKeyEvent::DOM_VK_CONTROL:
+    default:
+      aKeyEvent->GetCtrlKey(&isModifierPresent);
+  }
+
+  if (modifier == trueString) {
     if (!isModifierPresent)
       return PR_FALSE;
   }
   else if (modifier == falseString) {
-#ifdef XP_MAC
-    aKeyEvent->GetMetaKey(&isModifierPresent);
-#elif XP_UNIX
-    aKeyEvent->GetAltKey(&isModifierPresent);
-#else
-    aKeyEvent->GetCtrlKey(&isModifierPresent);
-#endif
-
     if (isModifierPresent)
       return PR_FALSE;
   }
@@ -505,31 +541,30 @@ nsXBLEventHandler::MouseEventMatched(nsIDOMMouseEvent* aMouseEvent)
   // XXX Check for button and modifier keys.
 // Now check modifier keys
   nsAutoString modifier;
-  PRBool isModifierPresent;
   mHandlerElement->GetAttribute(kNameSpaceID_None, kPrimaryAtom, modifier);
-  if (modifier == trueString) {
-    // The XUL key must be set.  Hard code for now.
-    // XXX Eventually pick up using CSS3 key-equivalent property or somesuch
-#ifdef XP_MAC
-    aMouseEvent->GetMetaKey(&isModifierPresent);
-#elif XP_UNIX
-    aMouseEvent->GetAltKey(&isModifierPresent);
-#else
-    aMouseEvent->GetCtrlKey(&isModifierPresent);
-#endif
 
+  // Get the xulkey
+  InitAccessKey();
+  PRBool isModifierPresent = PR_FALSE;
+  switch (mAccessKey)
+  {
+    case nsIDOMKeyEvent::DOM_VK_META:
+      aMouseEvent->GetMetaKey(&isModifierPresent);
+      break;
+
+    case nsIDOMKeyEvent::DOM_VK_ALT:
+      aMouseEvent->GetAltKey(&isModifierPresent);
+      break;
+
+    case nsIDOMKeyEvent::DOM_VK_CONTROL:
+    default:
+      aMouseEvent->GetCtrlKey(&isModifierPresent);
+  }
+  if (modifier == trueString) {
     if (!isModifierPresent)
       return PR_FALSE;
   }
   else if (modifier == falseString) {
-#ifdef XP_MAC
-    aMouseEvent->GetMetaKey(&isModifierPresent);
-#elif XP_UNIX
-    aMouseEvent->GetAltKey(&isModifierPresent);
-#else
-    aMouseEvent->GetCtrlKey(&isModifierPresent);
-#endif
-
     if (isModifierPresent)
       return PR_FALSE;
   }
diff --git a/content/xbl/src/nsXBLEventHandler.h b/content/xbl/src/nsXBLEventHandler.h
index 13537f4bf0c0..ec76aa87c47d 100644
--- a/content/xbl/src/nsXBLEventHandler.h
+++ b/content/xbl/src/nsXBLEventHandler.h
@@ -130,6 +130,9 @@ protected:
   nsIContent* mHandlerElement;
   nsAutoString mEventName;
 
+  void InitAccessKey();
+  PRInt32 mAccessKey;        // the default access key or "xulkey"
+
   nsXBLEventHandler* mNextHandler; // Handlers are chained for easy unloading later.
 };
 
diff --git a/dom/public/coreEvents/nsIDOMKeyEvent.h b/dom/public/coreEvents/nsIDOMKeyEvent.h
index d282623f2015..25b9aa00056f 100644
--- a/dom/public/coreEvents/nsIDOMKeyEvent.h
+++ b/dom/public/coreEvents/nsIDOMKeyEvent.h
@@ -150,7 +150,8 @@ public:
     DOM_VK_OPEN_BRACKET = 219,
     DOM_VK_BACK_SLASH = 220,
     DOM_VK_CLOSE_BRACKET = 221,
-    DOM_VK_QUOTE = 222
+    DOM_VK_QUOTE = 222,
+    DOM_VK_META = 224
   };
 
   NS_IMETHOD    GetCharCode(PRUint32* aCharCode)=0;
diff --git a/dom/public/idl/events/MouseKeyEvent.idl b/dom/public/idl/events/MouseKeyEvent.idl
index 1fcd7c231ec5..931e0d2b0080 100644
--- a/dom/public/idl/events/MouseKeyEvent.idl
+++ b/dom/public/idl/events/MouseKeyEvent.idl
@@ -123,6 +123,8 @@
 	      const unsigned long DOM_VK_CLOSE_BRACKET  = 0xDD;
 	      const unsigned long DOM_VK_QUOTE          = 0xDE;
 
+	      const unsigned long DOM_VK_META           = 0xE0;
+
 		  readonly	  attribute   unsigned long   charCode;
 		  readonly	  attribute   unsigned long   keyCode;
 
diff --git a/layout/xbl/src/nsXBLEventHandler.cpp b/layout/xbl/src/nsXBLEventHandler.cpp
index ca2af0ebb3f7..6db39a2fd2b7 100644
--- a/layout/xbl/src/nsXBLEventHandler.cpp
+++ b/layout/xbl/src/nsXBLEventHandler.cpp
@@ -45,6 +45,10 @@
 #include "nsIDOMEventReceiver.h"
 #include "nsXBLBinding.h"
 #include "nsIPrivateDOMEvent.h"
+#include "nsIPref.h"
+#include "nsIServiceManager.h"
+
+static NS_DEFINE_CID(kPrefServiceCID, NS_PREF_CID);
 
 PRUint32 nsXBLEventHandler::gRefCnt = 0;
 nsIAtom* nsXBLEventHandler::kKeyCodeAtom = nsnull;
@@ -71,6 +75,7 @@ nsXBLEventHandler::nsXBLEventHandler(nsIContent* aBoundElement, nsIContent* aHan
   mEventName.Assign(aEventName);
   mNextHandler = nsnull;
   gRefCnt++;
+  mAccessKey = -1;
   if (gRefCnt == 1) {
     kKeyCodeAtom = NS_NewAtom("keycode");
     kKeyAtom = NS_NewAtom("key");
@@ -371,7 +376,38 @@ nsresult nsXBLEventHandler::Destroy(nsIDOMEvent* aEvent)
   return NS_OK;
 }
 
-///////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////////
+// Get the menu access key from prefs.
+// XXX Eventually pick up using CSS3 key-equivalent property or somesuch
+void
+nsXBLEventHandler::InitAccessKey()
+{
+  if (mAccessKey >= 0)
+    return;
+
+  // Compiled-in defaults, in case we can't get the pref --
+  // mac doesn't have menu shortcuts, other platforms use alt.
+#ifndef XP_MAC
+  mAccessKey = nsIDOMKeyEvent::DOM_VK_ALT;
+#else
+  mAccessKey = 0;
+#endif
+
+  // Get the menu access key value from prefs, overriding the default:
+  nsresult rv;
+  NS_WITH_SERVICE(nsIPref, prefs, NS_PREF_PROGID, &rv);
+  if (NS_SUCCEEDED(rv) && prefs)
+  {
+    rv = prefs->GetIntPref("ui.key.menuAccessKey", &mAccessKey);
+  }
+#ifdef DEBUG_akkana
+  if (NS_FAILED(rv))
+  {
+    NS_ASSERTION(PR_FALSE,"XBLEventHandler couldn't get menu access key from prefs!\n");
+  }
+#endif
+}
+
 
 PRBool 
 nsXBLEventHandler::KeyEventMatched(nsIDOMKeyEvent* aKeyEvent)
@@ -409,31 +445,31 @@ nsXBLEventHandler::KeyEventMatched(nsIDOMKeyEvent* aKeyEvent)
 
   // Now check modifier keys
   nsAutoString modifier;
-  PRBool isModifierPresent;
   mHandlerElement->GetAttribute(kNameSpaceID_None, kPrimaryAtom, modifier);
-  if (modifier == trueString) {
-    // The XUL key must be set.  Hard code for now.
-    // XXX Eventually pick up using CSS3 key-equivalent property or somesuch
-#ifdef XP_MAC
-    aKeyEvent->GetMetaKey(&isModifierPresent);
-#elif XP_UNIX
-    aKeyEvent->GetAltKey(&isModifierPresent);
-#else
-    aKeyEvent->GetCtrlKey(&isModifierPresent);
-#endif
 
+  // Get the xulkey.
+  InitAccessKey();
+  PRBool isModifierPresent = PR_FALSE;
+  switch (mAccessKey)
+  {
+    case nsIDOMKeyEvent::DOM_VK_META:
+      aKeyEvent->GetMetaKey(&isModifierPresent);
+      break;
+
+    case nsIDOMKeyEvent::DOM_VK_ALT:
+      aKeyEvent->GetAltKey(&isModifierPresent);
+      break;
+
+    case nsIDOMKeyEvent::DOM_VK_CONTROL:
+    default:
+      aKeyEvent->GetCtrlKey(&isModifierPresent);
+  }
+
+  if (modifier == trueString) {
     if (!isModifierPresent)
       return PR_FALSE;
   }
   else if (modifier == falseString) {
-#ifdef XP_MAC
-    aKeyEvent->GetMetaKey(&isModifierPresent);
-#elif XP_UNIX
-    aKeyEvent->GetAltKey(&isModifierPresent);
-#else
-    aKeyEvent->GetCtrlKey(&isModifierPresent);
-#endif
-
     if (isModifierPresent)
       return PR_FALSE;
   }
@@ -505,31 +541,30 @@ nsXBLEventHandler::MouseEventMatched(nsIDOMMouseEvent* aMouseEvent)
   // XXX Check for button and modifier keys.
 // Now check modifier keys
   nsAutoString modifier;
-  PRBool isModifierPresent;
   mHandlerElement->GetAttribute(kNameSpaceID_None, kPrimaryAtom, modifier);
-  if (modifier == trueString) {
-    // The XUL key must be set.  Hard code for now.
-    // XXX Eventually pick up using CSS3 key-equivalent property or somesuch
-#ifdef XP_MAC
-    aMouseEvent->GetMetaKey(&isModifierPresent);
-#elif XP_UNIX
-    aMouseEvent->GetAltKey(&isModifierPresent);
-#else
-    aMouseEvent->GetCtrlKey(&isModifierPresent);
-#endif
 
+  // Get the xulkey
+  InitAccessKey();
+  PRBool isModifierPresent = PR_FALSE;
+  switch (mAccessKey)
+  {
+    case nsIDOMKeyEvent::DOM_VK_META:
+      aMouseEvent->GetMetaKey(&isModifierPresent);
+      break;
+
+    case nsIDOMKeyEvent::DOM_VK_ALT:
+      aMouseEvent->GetAltKey(&isModifierPresent);
+      break;
+
+    case nsIDOMKeyEvent::DOM_VK_CONTROL:
+    default:
+      aMouseEvent->GetCtrlKey(&isModifierPresent);
+  }
+  if (modifier == trueString) {
     if (!isModifierPresent)
       return PR_FALSE;
   }
   else if (modifier == falseString) {
-#ifdef XP_MAC
-    aMouseEvent->GetMetaKey(&isModifierPresent);
-#elif XP_UNIX
-    aMouseEvent->GetAltKey(&isModifierPresent);
-#else
-    aMouseEvent->GetCtrlKey(&isModifierPresent);
-#endif
-
     if (isModifierPresent)
       return PR_FALSE;
   }
diff --git a/layout/xbl/src/nsXBLEventHandler.h b/layout/xbl/src/nsXBLEventHandler.h
index 13537f4bf0c0..ec76aa87c47d 100644
--- a/layout/xbl/src/nsXBLEventHandler.h
+++ b/layout/xbl/src/nsXBLEventHandler.h
@@ -130,6 +130,9 @@ protected:
   nsIContent* mHandlerElement;
   nsAutoString mEventName;
 
+  void InitAccessKey();
+  PRInt32 mAccessKey;        // the default access key or "xulkey"
+
   nsXBLEventHandler* mNextHandler; // Handlers are chained for easy unloading later.
 };
 
diff --git a/layout/xul/base/src/nsMenuBarListener.cpp b/layout/xul/base/src/nsMenuBarListener.cpp
index 2bb2e26a0f63..91adf9e6fa1b 100644
--- a/layout/xul/base/src/nsMenuBarListener.cpp
+++ b/layout/xul/base/src/nsMenuBarListener.cpp
@@ -46,6 +46,10 @@
 #include "nsIView.h"
 #include "nsISupportsArray.h"
 
+#include "nsIPref.h"
+
+static NS_DEFINE_CID(kPrefServiceCID, NS_PREF_CID);
+
 /*
  * nsMenuBarListener implementation
  */
@@ -58,7 +62,7 @@ NS_IMPL_QUERY_INTERFACE3(nsMenuBarListener, nsIDOMKeyListener, nsIDOMFocusListen
 ////////////////////////////////////////////////////////////////////////
 
 nsMenuBarListener::nsMenuBarListener(nsMenuBarFrame* aMenuBar) 
-:mAltKeyDown(PR_FALSE)
+  :mAccessKeyDown(PR_FALSE), mAccessKey(-1)
 {
   NS_INIT_REFCNT();
   mMenuBarFrame = aMenuBar;
@@ -69,34 +73,64 @@ nsMenuBarListener::~nsMenuBarListener()
 {
 }
 
+void nsMenuBarListener::InitAccessKey()
+{
+  if (mAccessKey >= 0)
+    return;
 
+  // Compiled-in defaults, in case we can't get LookAndFeel --
+  // mac doesn't have menu shortcuts, other platforms use alt.
+#ifndef XP_MAC
+  mAccessKey = nsIDOMKeyEvent::DOM_VK_ALT;
+#else
+  mAccessKey = 0;
+#endif
+
+  // Get the menu access key value from prefs, overriding the default:
+  nsresult rv;
+  NS_WITH_SERVICE(nsIPref, prefs, NS_PREF_PROGID, &rv);
+  if (NS_SUCCEEDED(rv) && prefs)
+  {
+    rv = prefs->GetIntPref("ui.key.menuAccessKey", &mAccessKey);
+  }
+#ifdef DEBUG_akkana
+  if (NS_FAILED(rv))
+  {
+    NS_ASSERTION(PR_FALSE,"Menubar listener couldn't get accel key from prefs!\n");
+  }
+#endif
+}
 
 ////////////////////////////////////////////////////////////////////////
 nsresult
 nsMenuBarListener::KeyUp(nsIDOMEvent* aKeyEvent)
 {  
-  // On a press of the ALT key by itself, we toggle the menu's 
-  // active/inactive state.
-  // Get the ascii key code.
-  nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aKeyEvent);
-  PRUint32 theChar;
-	keyEvent->GetKeyCode(&theChar);
+  InitAccessKey();
 
-#if !defined(XP_UNIX) || defined(NTO)
-  if (theChar == NS_VK_ALT && mAltKeyDown) {
-    // The ALT key was down and is now up.
-    mMenuBarFrame->ToggleMenuActiveState();
+  if (mAccessKey)
+  {
+    // On a press of the ALT key by itself, we toggle the menu's 
+    // active/inactive state.
+    // Get the ascii key code.
+    nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aKeyEvent);
+    PRUint32 theChar;
+    keyEvent->GetKeyCode(&theChar);
+
+    if (mAccessKeyDown && (PRInt32)theChar == mAccessKey)
+    {
+      // The access key was down and is now up.
+      mMenuBarFrame->ToggleMenuActiveState();
+    }
+    mAccessKeyDown = PR_FALSE; 
+
+    PRBool active = mMenuBarFrame->IsActive();
+    if (active) {
+      aKeyEvent->PreventBubble();
+      aKeyEvent->PreventCapture();
+      aKeyEvent->PreventDefault();
+      return NS_ERROR_BASE; // I am consuming event
+    }
   }
-  mAltKeyDown = PR_FALSE; 
-#endif
-
-  PRBool active = mMenuBarFrame->IsActive();
-  if (active) {
-	  aKeyEvent->PreventBubble();
-    aKeyEvent->PreventCapture();
-    aKeyEvent->PreventDefault();
-    return NS_ERROR_BASE; // I am consuming event
-  } 
   
   return NS_OK; // means I am NOT consuming event
 }
@@ -105,36 +139,39 @@ nsMenuBarListener::KeyUp(nsIDOMEvent* aKeyEvent)
 nsresult
 nsMenuBarListener::KeyPress(nsIDOMEvent* aKeyEvent)
 {
-#if !defined(XP_UNIX) || defined(NTO)
-  nsCOMPtr<nsIDOMNSUIEvent> nsUIEvent = do_QueryInterface(aKeyEvent);
-  PRBool preventDefault;
+  InitAccessKey();
 
-  nsUIEvent->GetPreventDefault(&preventDefault);
-  if (!preventDefault) {
-    nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aKeyEvent);
-    PRUint32 theChar;
-	  keyEvent->GetKeyCode(&theChar);
+  if (mAccessKey)
+  {
+    nsCOMPtr<nsIDOMNSUIEvent> nsUIEvent = do_QueryInterface(aKeyEvent);
+    PRBool preventDefault;
 
-    if (mAltKeyDown && (theChar != NS_VK_ALT)) {
-      mAltKeyDown = PR_FALSE;
+    nsUIEvent->GetPreventDefault(&preventDefault);
+    if (!preventDefault) {
+      nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aKeyEvent);
+      PRUint32 theChar;
+      keyEvent->GetKeyCode(&theChar);
 
-      // Do shortcut navigation.
-      // A letter was pressed. We want to see if a shortcut gets matched. If
-      // so, we'll know the menu got activated.
-      keyEvent->GetCharCode(&theChar);
+      if (mAccessKeyDown && ((PRInt32)theChar != mAccessKey)) {
+        mAccessKeyDown = PR_FALSE;
 
-      PRBool active = PR_FALSE;
-      mMenuBarFrame->ShortcutNavigation(theChar, active);
+        // Do shortcut navigation.
+        // A letter was pressed. We want to see if a shortcut gets matched. If
+        // so, we'll know the menu got activated.
+        keyEvent->GetCharCode(&theChar);
 
-      if (active) {
-	      aKeyEvent->PreventBubble();
-        aKeyEvent->PreventCapture();
-        aKeyEvent->PreventDefault();
-      }
-    return NS_ERROR_BASE; // I am consuming event
-    }    
-  } 
-#endif
+        PRBool active = PR_FALSE;
+        mMenuBarFrame->ShortcutNavigation(theChar, active);
+
+        if (active) {
+          aKeyEvent->PreventBubble();
+          aKeyEvent->PreventCapture();
+          aKeyEvent->PreventDefault();
+        }
+        return NS_ERROR_BASE; // I am consuming event
+      }    
+    } 
+  }
   return NS_OK;
 }
 
@@ -142,31 +179,56 @@ nsMenuBarListener::KeyPress(nsIDOMEvent* aKeyEvent)
 nsresult
 nsMenuBarListener::KeyDown(nsIDOMEvent* aKeyEvent)
 {
-#if !defined(XP_UNIX) || defined(NTO)
-  nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aKeyEvent);
-  PRUint32 theChar;
-	keyEvent->GetKeyCode(&theChar);
-  PRBool alt;
-  keyEvent->GetAltKey(&alt);
-  if (theChar == NS_VK_TAB && mAltKeyDown) {
-    mAltKeyDown = PR_FALSE;
-  }
+  InitAccessKey();
 
-  if (theChar == NS_VK_ALT && alt) {
-    // No other modifiers can be down.
-    // Especially CTRL.  CTRL+ALT == AltGR, and
-    // we'll fuck up on non-US enhanced 102-key
-    // keyboards if we don't check this.
-    PRBool ctrl,shift,meta;
-    keyEvent->GetCtrlKey(&ctrl);
-    keyEvent->GetShiftKey(&shift);
-    keyEvent->GetMetaKey(&meta);
-    if (!(ctrl || shift || meta)) {
-      // The ALT key just went down by itself. Track this.
-      mAltKeyDown = PR_TRUE;
+  if (mAccessKey)
+  {
+    nsCOMPtr<nsIDOMKeyEvent> keyEvent = do_QueryInterface(aKeyEvent);
+    PRUint32 theChar;
+    keyEvent->GetKeyCode(&theChar);
+
+    PRBool access;
+    switch (mAccessKey)
+    {
+      case nsIDOMKeyEvent::DOM_VK_CONTROL:
+        keyEvent->GetCtrlKey(&access);
+        break;
+      case nsIDOMKeyEvent::DOM_VK_ALT:
+        keyEvent->GetAltKey(&access);
+        break;
+      case nsIDOMKeyEvent::DOM_VK_META:
+        keyEvent->GetMetaKey(&access);
+        break;
+      default:
+        access = 0;
+    }
+    if (theChar == nsIDOMKeyEvent::DOM_VK_TAB && mAccessKeyDown) {
+      mAccessKeyDown = PR_FALSE;
+    }
+
+    if (theChar == mAccessKey || access) {
+      // No other modifiers can be down.
+      // Especially CTRL.  CTRL+ALT == AltGR, and
+      // we'll fuck up on non-US enhanced 102-key
+      // keyboards if we don't check this.
+      PRBool ctrl = PR_FALSE;
+      if (mAccessKey != nsIDOMKeyEvent::DOM_VK_CONTROL)
+        keyEvent->GetCtrlKey(&ctrl);
+      PRBool alt=PR_FALSE;
+      if (mAccessKey != nsIDOMKeyEvent::DOM_VK_ALT)
+        keyEvent->GetAltKey(&alt);
+      PRBool shift=PR_FALSE;
+      if (mAccessKey != nsIDOMKeyEvent::DOM_VK_SHIFT)
+        keyEvent->GetShiftKey(&shift);
+      PRBool meta=PR_FALSE;
+      if (mAccessKey != nsIDOMKeyEvent::DOM_VK_META)
+        keyEvent->GetMetaKey(&meta);
+      if (!(ctrl || alt || shift || meta)) {
+        // The access key just went down by itself. Track this.
+        mAccessKeyDown = PR_TRUE;
+      }
     }
   }
-#endif
 
   return NS_OK; // means I am NOT consuming event
 }
@@ -187,7 +249,7 @@ nsMenuBarListener::Blur(nsIDOMEvent* aEvent)
 	  mMenuBarFrame->ToggleMenuActiveState();
 	  PRBool handled;
     mMenuBarFrame->Escape(handled);
-	  mAltKeyDown = PR_FALSE;
+	  mAccessKeyDown = PR_FALSE;
   }
   return NS_OK; // means I am NOT consuming event
 }
@@ -200,7 +262,7 @@ nsMenuBarListener::MouseDown(nsIDOMEvent* aMouseEvent)
 	  mMenuBarFrame->ToggleMenuActiveState();
 	  PRBool handled;
     mMenuBarFrame->Escape(handled);
-	  mAltKeyDown = PR_FALSE;
+	  mAccessKeyDown = PR_FALSE;
   }
   return NS_OK; // means I am NOT consuming event
 }
diff --git a/layout/xul/base/src/nsMenuBarListener.h b/layout/xul/base/src/nsMenuBarListener.h
index dd8f1ad5201f..af80ab051d37 100644
--- a/layout/xul/base/src/nsMenuBarListener.h
+++ b/layout/xul/base/src/nsMenuBarListener.h
@@ -64,8 +64,11 @@ public:
   NS_DECL_ISUPPORTS
 
 protected:
+  void InitAccessKey();
+
   nsMenuBarFrame* mMenuBarFrame; // The menu bar object.
-  PRBool mAltKeyDown;            // Whether or not the ALT key is currently down.
+  PRBool mAccessKeyDown;         // Whether or not the ALT key is currently down.
+  PRInt32 mAccessKey;            // See nsIDOMKeyEvent.h for sample values
 };
 
 
diff --git a/layout/xul/base/src/nsMenuFrame.cpp b/layout/xul/base/src/nsMenuFrame.cpp
index ba5d12ebaa10..1e16841f75e8 100644
--- a/layout/xul/base/src/nsMenuFrame.cpp
+++ b/layout/xul/base/src/nsMenuFrame.cpp
@@ -63,7 +63,9 @@
 #include "nsIServiceManager.h"
 #include "nsIXBLService.h"
 #include "nsCSSFrameConstructor.h"
-
+#include "nsIDOMKeyEvent.h"
+#include "nsIPref.h"
+ 
 #define NS_MENU_POPUP_LIST_INDEX   0
 
 static PRInt32 gEatMouseMove = PR_FALSE;
@@ -72,7 +74,7 @@ nsMenuDismissalListener* nsMenuFrame::mDismissalListener = nsnull;
 
 static NS_DEFINE_IID(kLookAndFeelCID, NS_LOOKANDFEEL_CID);
 static NS_DEFINE_IID(kILookAndFeelIID, NS_ILOOKANDFEEL_IID);
-
+static NS_DEFINE_CID(kPrefServiceCID, NS_PREF_CID);
 
 //
 // NS_NewMenuFrame
@@ -135,7 +137,7 @@ nsMenuFrame::nsMenuFrame(nsIPresShell* aShell):nsBoxFrame(aShell),
 NS_IMETHODIMP
 nsMenuFrame::SetParent(const nsIFrame* aParent)
 {
-  nsresult rv = nsBoxFrame::SetParent(aParent);
+  nsBoxFrame::SetParent(aParent);
   nsIFrame* currFrame = (nsIFrame*)aParent;
   while (!mMenuParent && currFrame) {
     // Set our menu parent.
@@ -1363,61 +1365,79 @@ nsMenuFrame::BuildAcceleratorText(nsString& aAccelString)
   
   nsAutoString keyAtom; keyAtom.AssignWithConversion("key");
   nsAutoString shiftAtom; shiftAtom.AssignWithConversion("shift");
-	nsAutoString altAtom; altAtom.AssignWithConversion("alt");
-	nsAutoString commandAtom; commandAtom.AssignWithConversion("command");
+  nsAutoString altAtom; altAtom.AssignWithConversion("alt");
+  nsAutoString commandAtom; commandAtom.AssignWithConversion("command");
   nsAutoString controlAtom; controlAtom.AssignWithConversion("control");
 
-	nsAutoString shiftValue;
-	nsAutoString altValue;
-	nsAutoString commandValue;
+  nsAutoString shiftValue;
+  nsAutoString altValue;
+  nsAutoString commandValue;
   nsAutoString controlValue;
-	nsAutoString keyChar; keyChar.AssignWithConversion(" ");
+  nsAutoString keyChar; keyChar.AssignWithConversion(" ");
 	
-	keyElement->GetAttribute(keyAtom, keyChar);
-	keyElement->GetAttribute(shiftAtom, shiftValue);
-	keyElement->GetAttribute(altAtom, altValue);
-	keyElement->GetAttribute(commandAtom, commandValue);
+  keyElement->GetAttribute(keyAtom, keyChar);
+  keyElement->GetAttribute(shiftAtom, shiftValue);
+  keyElement->GetAttribute(altAtom, altValue);
+  keyElement->GetAttribute(commandAtom, commandValue);
   keyElement->GetAttribute(controlAtom, controlValue);
 	  
-  nsAutoString xulkey;
-  keyElement->GetAttribute(NS_ConvertASCIItoUCS2("xulkey"), xulkey);
-  if (xulkey.EqualsWithConversion("true")) {
-    // Set the default for the xul key modifier
-#ifdef XP_MAC
-    commandValue.AssignWithConversion("true");
-#elif defined(XP_PC) || defined(NTO)
-    controlValue.AssignWithConversion("true");
-#else 
-    altValue.AssignWithConversion("true");
-#endif
-  }
-  
+  PRInt32 accelKey = 0;
+
   PRBool prependPlus = PR_FALSE;
 
-  if(!commandValue.IsEmpty() && !commandValue.EqualsWithConversion("false")) {
-    prependPlus = PR_TRUE;
-	  aAccelString.AppendWithConversion("Ctrl"); // Hmmm. Kinda defeats the point of having an abstraction.
+  nsAutoString xulkey;
+  keyElement->GetAttribute(NS_ConvertASCIItoUCS2("xulkey"), xulkey);
+  if (xulkey.EqualsWithConversion("true"))
+  {
+    // Compiled-in defaults, in case we can't get LookAndFeel --
+    // command for mac, control for all other platforms.
+#ifdef XP_MAC
+    accelKey = nsIDOMKeyEvent::DOM_VK_META;
+#else
+    accelKey = nsIDOMKeyEvent::DOM_VK_CONTROL;
+#endif
+
+    // Get the accelerator key value from prefs, overriding the default:
+    nsresult rv;
+    NS_WITH_SERVICE(nsIPref, prefs, NS_PREF_PROGID, &rv);
+    if (NS_SUCCEEDED(rv) && prefs)
+    {
+      rv = prefs->GetIntPref("ui.key.acceleratorKey", &accelKey);
+    }
+#ifdef DEBUG_akkana
+    else
+    {
+      NS_ASSERTION(PR_FALSE,"Menu couldn't get accel key from prefs!\n");
+    }
+#endif
+
+    switch (accelKey)
+    {
+      case nsIDOMKeyEvent::DOM_VK_META:
+        prependPlus = PR_TRUE;
+        aAccelString.AppendWithConversion("Ctrl"); // Hmmm. Kinda defeats the point of having an abstraction.
+        break;
+
+      case nsIDOMKeyEvent::DOM_VK_ALT:
+        prependPlus = PR_TRUE;
+        aAccelString.AppendWithConversion("Alt");
+        break;
+
+      case nsIDOMKeyEvent::DOM_VK_CONTROL:
+      default:
+        prependPlus = PR_TRUE;
+        aAccelString.AppendWithConversion("Ctrl");
+        break;
+    }
   }
 
-  if(!controlValue.IsEmpty() && !controlValue.EqualsWithConversion("false")) {
-    prependPlus = PR_TRUE;
-	  aAccelString.AppendWithConversion("Ctrl");
-  }
-
-  if(!shiftValue.IsEmpty() && !shiftValue.EqualsWithConversion("false")) {
+  if (!shiftValue.IsEmpty() && !shiftValue.EqualsWithConversion("false")) {
     if (prependPlus)
       aAccelString.AppendWithConversion("+");
     prependPlus = PR_TRUE;
     aAccelString.AppendWithConversion("Shift");
   }
 
-  if (!altValue.IsEmpty() && !altValue.EqualsWithConversion("false")) {
-	  if (prependPlus)
-      aAccelString.AppendWithConversion("+");
-    prependPlus = PR_TRUE;
-    aAccelString.AppendWithConversion("Alt");
-  }
-
   keyChar.ToUpperCase();
   if (!keyChar.IsEmpty()) {
     if (prependPlus)
diff --git a/layout/xul/base/src/nsTextBoxFrame.cpp b/layout/xul/base/src/nsTextBoxFrame.cpp
index 93f22d658e36..45577c3c3897 100644
--- a/layout/xul/base/src/nsTextBoxFrame.cpp
+++ b/layout/xul/base/src/nsTextBoxFrame.cpp
@@ -133,10 +133,9 @@ nsTextBoxFrame::Init(nsIPresContext*  aPresContext,
   UpdateAttributes(aPresContext, nsnull, a, b, c  /* all */);
 
 // the following block is to append the accesskey to to mTitle if there is an accesskey 
-// but the mTitle doesn't have the character 
+// but the mTitle doesn't have the character
+  // XXX Should this code first check to see if there's a menuAccessKey?
 
- 
-#ifndef XP_UNIX
   nsAutoString accesskey;
   mContent->GetAttribute(kNameSpaceID_None, nsXULAtoms::accesskey,
                          accesskey);
@@ -163,7 +162,6 @@ nsTextBoxFrame::Init(nsIPresContext*  aPresContext,
           mAccessKeyInfo = nsnull;
       }
   }
-#endif
 
   return rv;
 }
diff --git a/layout/xul/base/src/nsTitledButtonFrame.cpp b/layout/xul/base/src/nsTitledButtonFrame.cpp
index 3bc7df387ab7..e4c2167385ed 100644
--- a/layout/xul/base/src/nsTitledButtonFrame.cpp
+++ b/layout/xul/base/src/nsTitledButtonFrame.cpp
@@ -305,9 +305,9 @@ nsTitledButtonFrame::Init(nsIPresContext*  aPresContext,
 
 // the following block is to append the accesskey to to mTitle if there is an accesskey 
 // but the mTitle doesn't have the character 
+  // XXX Should this code first check to see if there's a menuAccessKey?
 
   mAccesskeyIndex = -1;
-#ifndef XP_UNIX
   nsAutoString accesskey;
   mContent->GetAttribute(kNameSpaceID_None, nsXULAtoms::accesskey,
                          accesskey);
@@ -325,7 +325,6 @@ nsTitledButtonFrame::Init(nsIPresContext*  aPresContext,
 		  	mTitle += tmpstring;
 	  }
   }
-#endif
 
   return rv;
 }
diff --git a/modules/libpref/src/init/all.js b/modules/libpref/src/init/all.js
index 0ba37c83c5ce..3a1e54fad84d 100644
--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -414,6 +414,11 @@ pref("signed.applets.codebase_principal_support", false);
 pref("security.checkloaduri", true);
 pref("security.xpconnect.plugin.unrestricted", true);
 
+// Modifier key prefs: default to Windows settings,
+// menu access key = alt, accelerator key = control.
+pref("ui.key.acceleratorKey", 17);
+pref("ui.key.menuAccessKey", 18);
+
 // Middle-mouse handling
 pref("middlemouse.paste", false);
 pref("middlemouse.openNewWindow", false);
diff --git a/modules/libpref/src/mac/macprefs.js b/modules/libpref/src/mac/macprefs.js
index 8c733163c15f..489578fbd6d3 100644
--- a/modules/libpref/src/mac/macprefs.js
+++ b/modules/libpref/src/mac/macprefs.js
@@ -138,6 +138,9 @@ pref("font.name.monospace.zh-TW", "Apple LiGothic Medium");
 pref("font.name.cursive.zh-TW", "XXX.cursive");
 pref("font.name.fantasy.zh-TW", "XXX.fantasy");
 
+// Override the Windows settings: no menu key, meta accelerator key.
+pref("ui.key.menuAccessKey", 0);
+pref("ui.key.acceleratorKey", 224);
 
 // This overrides the setting in config.js (which points to the Windows page)
 config("menu.help.item_0.label","Help Contents");
diff --git a/rdf/content/src/nsXULKeyListener.cpp b/rdf/content/src/nsXULKeyListener.cpp
index 62da8e1c3ace..e11d5983731a 100644
--- a/rdf/content/src/nsXULKeyListener.cpp
+++ b/rdf/content/src/nsXULKeyListener.cpp
@@ -1,4 +1,4 @@
-/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  *
  * The contents of this file are subject to the Netscape Public
  * License Version 1.1 (the "License"); you may not use this file
@@ -63,6 +63,8 @@
 #include "nsIDocumentViewer.h"
 #include "nsIPresContext.h"
 #include "nsIDOMEventTarget.h"
+#include "nsIPref.h"
+#include "nsIServiceManager.h"
 
 #include "nsIObserver.h"
 #include "nsIObserverService.h"
@@ -196,6 +198,8 @@ static NS_DEFINE_IID(kIDomNodeIID,            NS_IDOMNODE_IID);
 static NS_DEFINE_IID(kIDomElementIID,         NS_IDOMELEMENT_IID);
 static NS_DEFINE_IID(kIDomEventListenerIID,   NS_IDOMEVENTLISTENER_IID);
 
+static NS_DEFINE_CID(kPrefServiceCID, NS_PREF_CID);
+
 enum eEventType {
   eKeyPress,
   eKeyDown,
@@ -308,10 +312,9 @@ private:
 
     static nsSupportsHashtable* mKeyBindingTable;
 
-    // The "xul key" modifier can be any of the known modifiers:
-    enum {
-        xulKeyNone, xulKeyShift, xulKeyControl, xulKeyAlt, xulKeyMeta
-    } mXULKeyModifier;
+    // The "xul key" modifier is a key code from nsIDOMKeyEvent,
+    // e.g. nsIDOMKeyEvent::DOM_VK_CONTROL
+    PRUint32 mXULKeyModifier;
 };
 
 nsSupportsHashtable* nsXULKeyListenerImpl::mKeyBindingTable = nsnull;
@@ -461,14 +464,29 @@ nsXULKeyListenerImpl::Init(
 
   mDOMDocument = xulDoc; // Weak reference.
 
-  // Set the default for the xul key modifier
+  // Compiled-in defaults, in case we can't get LookAndFeel --
+  // command for mac, control for all other platforms.
 #ifdef XP_MAC
-  mXULKeyModifier = xulKeyMeta;
-#elif XP_UNIX
-  mXULKeyModifier = xulKeyAlt;
+  mXULKeyModifier = nsIDOMKeyEvent::DOM_VK_META;
 #else
-  mXULKeyModifier = xulKeyControl;
+  mXULKeyModifier = nsIDOMKeyEvent::DOM_VK_CONTROL;
 #endif
+
+  // Get the accelerator key value from prefs, overriding the default:
+  nsresult rv;
+  NS_WITH_SERVICE(nsIPref, prefs, NS_PREF_PROGID, &rv);
+  if (NS_SUCCEEDED(rv) && prefs)
+  {
+    rv = prefs->GetIntPref("ui.key.acceleratorKey",
+                           (PRInt32*)&mXULKeyModifier);
+  }
+#ifdef DEBUG_akkana
+  else
+  {
+    NS_ASSERTION(PR_FALSE, "XULKeyListener couldn't get accel key from prefs!\n");
+  }
+#endif
+
   return NS_OK;
 }
 
@@ -1478,7 +1496,7 @@ nsXULKeyListenerImpl::HandleEventUsingKeyset(nsIDOMElement* aKeysetElement, nsID
             || (property == falseString && isModKey))
             break;
         // and also the xul key, if it's specified to be shift:
-        if (xulKeyShift == mXULKeyModifier &&
+        if (nsIDOMKeyEvent::DOM_VK_SHIFT == mXULKeyModifier &&
             ((xproperty == trueString && !isModKey)
              || (xproperty == falseString && isModKey)))
             break;
@@ -1491,7 +1509,7 @@ nsXULKeyListenerImpl::HandleEventUsingKeyset(nsIDOMElement* aKeysetElement, nsID
           || (property == falseString && isModKey))
           break;
         // and if xul is control:
-        if (xulKeyControl == mXULKeyModifier &&
+        if (nsIDOMKeyEvent::DOM_VK_CONTROL == mXULKeyModifier &&
             ((xproperty == trueString && !isModKey)
              || (xproperty == falseString && isModKey)))
             break;
@@ -1504,7 +1522,7 @@ nsXULKeyListenerImpl::HandleEventUsingKeyset(nsIDOMElement* aKeysetElement, nsID
           || (property == falseString && isModKey))
           break;
         // and if xul is alt:
-        if (xulKeyAlt == mXULKeyModifier &&
+        if (nsIDOMKeyEvent::DOM_VK_ALT == mXULKeyModifier &&
           ((xproperty == trueString && !isModKey)
            || (xproperty == falseString && isModKey)))
           break;
@@ -1517,7 +1535,7 @@ nsXULKeyListenerImpl::HandleEventUsingKeyset(nsIDOMElement* aKeysetElement, nsID
           || (property == falseString && isModKey))
           break;
         // and if xul is meta:
-        if (xulKeyMeta == mXULKeyModifier &&
+        if (nsIDOMKeyEvent::DOM_VK_META == mXULKeyModifier &&
           ((xproperty == trueString && !isModKey)
            || (xproperty == falseString && isModKey)))
           break;
diff --git a/widget/public/nsGUIEvent.h b/widget/public/nsGUIEvent.h
index ce8a6820b507..cfa2ae2f661e 100644
--- a/widget/public/nsGUIEvent.h
+++ b/widget/public/nsGUIEvent.h
@@ -601,6 +601,8 @@ enum nsDragDropEventStatus {
 #define NS_VK_CLOSE_BRACKET  0xDD
 #define NS_VK_QUOTE          0xDE
 
+#define NS_VK_META           0xE0
+
 #define NS_EVENT_FLAG_NONE          0x0000
 #define NS_EVENT_FLAG_INIT          0x0001
 #define NS_EVENT_FLAG_BUBBLE        0x0002