diff --git a/content/events/src/nsDOMBeforeUnloadEvent.cpp b/content/events/src/nsDOMBeforeUnloadEvent.cpp
index 3a51500e591..99193648efd 100644
--- a/content/events/src/nsDOMBeforeUnloadEvent.cpp
+++ b/content/events/src/nsDOMBeforeUnloadEvent.cpp
@@ -59,6 +59,11 @@ nsDOMBeforeUnloadEvent::nsDOMBeforeUnloadEvent(nsPresContext* aPresContext,
 
 nsDOMBeforeUnloadEvent::~nsDOMBeforeUnloadEvent() 
 {
+  if (mEventIsInternal &&
+      mEvent->eventStructType == NS_BEFORE_PAGE_UNLOAD_EVENT) {
+      delete static_cast<nsBeforePageUnloadEvent*>(mEvent);
+      mEvent = nsnull;
+  }
 }
 
 NS_IMPL_ADDREF_INHERITED(nsDOMBeforeUnloadEvent, nsDOMEvent)
diff --git a/content/events/src/nsDOMCommandEvent.cpp b/content/events/src/nsDOMCommandEvent.cpp
index b7c3ca4c3c4..bd47d02a0c8 100644
--- a/content/events/src/nsDOMCommandEvent.cpp
+++ b/content/events/src/nsDOMCommandEvent.cpp
@@ -51,6 +51,14 @@ nsDOMCommandEvent::nsDOMCommandEvent(nsPresContext* aPresContext,
   }
 }
 
+nsDOMCommandEvent::~nsDOMCommandEvent()
+{
+  if (mEventIsInternal && mEvent->eventStructType == NS_COMMAND_EVENT) {
+    delete static_cast<nsCommandEvent*>(mEvent);
+    mEvent = nsnull;
+  }
+}
+
 NS_INTERFACE_MAP_BEGIN(nsDOMCommandEvent)
   NS_INTERFACE_MAP_ENTRY(nsIDOMCommandEvent)
   NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(CommandEvent)
diff --git a/content/events/src/nsDOMCommandEvent.h b/content/events/src/nsDOMCommandEvent.h
index 1700d537eb8..69c47f39c16 100644
--- a/content/events/src/nsDOMCommandEvent.h
+++ b/content/events/src/nsDOMCommandEvent.h
@@ -47,6 +47,7 @@ class nsDOMCommandEvent : public nsDOMEvent,
 public:
   nsDOMCommandEvent(nsPresContext* aPresContext,
                     nsCommandEvent* aEvent);
+  virtual ~nsDOMCommandEvent();
 
   NS_DECL_ISUPPORTS_INHERITED