diff --git a/browser/base/content/tabbrowser.xml b/browser/base/content/tabbrowser.xml
index 4efa59e34..c454a3e1d 100644
--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@@ -3924,6 +3924,8 @@ let remote = false;
             }
           }
 
+// Look for "macosx" if you are porting TenFourFox to another platform.
+/*
           if (this.AppConstants.platform != "macosx") {
             if (aEvent.ctrlKey && !aEvent.shiftKey && !aEvent.metaKey &&
                 aEvent.keyCode == KeyEvent.DOM_VK_F4 &&
@@ -3932,6 +3934,7 @@ let remote = false;
               aEvent.preventDefault();
             }
           }
+*/
         ]]></body>
       </method>
 
@@ -3946,7 +3949,7 @@ let remote = false;
           if (aEvent.altKey)
             return;
 
-          if (this.AppConstants.platform == "macosx") {
+          //if (this.AppConstants.platform == "macosx") {
             if (!aEvent.metaKey)
               return;
 
@@ -3960,7 +3963,7 @@ let remote = false;
                 this.tabContainer.advanceSelectedTab(offset, true);
                 aEvent.preventDefault();
             }
-          }
+          //}
         ]]></body>
       </method>
 
@@ -4171,9 +4174,9 @@ let remote = false;
           let els = Components.classes["@mozilla.org/eventlistenerservice;1"]
                               .getService(nsIEventListenerService);
           els.addSystemEventListener(document, "keydown", this, false);
-          if (this.AppConstants.platform == "macosx") {
+          //if (this.AppConstants.platform == "macosx") {
             els.addSystemEventListener(document, "keypress", this, false);
-          }
+          //}
           window.addEventListener("sizemodechange", this, false);
 
           var uniqueId = this._generateUniquePanelID();
@@ -4271,9 +4274,9 @@ let remote = false;
           let els = Components.classes["@mozilla.org/eventlistenerservice;1"]
                               .getService(nsIEventListenerService);
           els.removeSystemEventListener(document, "keydown", this, false);
-          if (this.AppConstants.platform == "macosx") {
+          //if (this.AppConstants.platform == "macosx") {
             els.removeSystemEventListener(document, "keypress", this, false);
-          }
+          //}
           window.removeEventListener("sizemodechange", this, false);
 
 /*
@@ -5417,11 +5420,13 @@ let remote = false;
           return;
 
         let wrongModifiers;
-        if (this.tabbrowser.AppConstants.platform == "macosx") {
+        //if (this.tabbrowser.AppConstants.platform == "macosx") {
           wrongModifiers = !event.metaKey;
+	/*
         } else {
           wrongModifiers = !event.ctrlKey || event.metaKey;
         }
+	*/
 
         if (wrongModifiers)
           return;
diff --git a/toolkit/content/globalOverlay.js b/toolkit/content/globalOverlay.js
index 051a98c43..c0d972860 100644
--- a/toolkit/content/globalOverlay.js
+++ b/toolkit/content/globalOverlay.js
@@ -6,6 +6,8 @@ function closeWindow(aClose, aPromptFunction)
 {
   let { AppConstants } = Components.utils.import("resource://gre/modules/AppConstants.jsm");
 
+// See TenFourFox issue 441.
+/*
   // Closing the last window doesn't quit the application on OS X.
   if (AppConstants.platform != "macosx") {
     var windowCount = 0;
@@ -27,7 +29,7 @@ function closeWindow(aClose, aPromptFunction)
       return false;
     if (windowCount != 1 && typeof(aPromptFunction) == "function" && !aPromptFunction())
       return false;
-  } else if (typeof(aPromptFunction) == "function" && !aPromptFunction()) {
+  } else */ if (typeof(aPromptFunction) == "function" && !aPromptFunction()) {
     return false;
   }