diff --git a/content/base/src/nsContentUtils.cpp b/content/base/src/nsContentUtils.cpp
index ddf00a6aeb96..eece10335fbe 100644
--- a/content/base/src/nsContentUtils.cpp
+++ b/content/base/src/nsContentUtils.cpp
@@ -4945,12 +4945,9 @@ nsContentUtils::SetDataTransferInEvent(nsDragEvent* aDragEvent)
     // A dataTransfer won't exist when a drag was started by some other
     // means, for instance calling the drag service directly, or a drag
     // from another application. In either case, a new dataTransfer should
-    // be created that reflects the data. Pass true to the constructor for
-    // the aIsExternal argument, so that only system access is allowed.
-    PRUint32 action = 0;
-    dragSession->GetDragAction(&action);
+    // be created that reflects the data.
     initialDataTransfer =
-      new nsDOMDataTransfer(aDragEvent->message, action);
+      new nsDOMDataTransfer(aDragEvent->message);
     NS_ENSURE_TRUE(initialDataTransfer, NS_ERROR_OUT_OF_MEMORY);
 
     // now set it in the drag session so we don't need to create it again
diff --git a/content/events/src/nsDOMDataTransfer.cpp b/content/events/src/nsDOMDataTransfer.cpp
index 98c6b7696bef..d49a2bc740d8 100644
--- a/content/events/src/nsDOMDataTransfer.cpp
+++ b/content/events/src/nsDOMDataTransfer.cpp
@@ -84,9 +84,10 @@ nsDOMDataTransfer::nsDOMDataTransfer()
 {
 }
 
-nsDOMDataTransfer::nsDOMDataTransfer(PRUint32 aEventType, PRUint32 aAction)
+nsDOMDataTransfer::nsDOMDataTransfer(PRUint32 aEventType)
   : mEventType(aEventType),
     mDropEffect(nsIDragService::DRAGDROP_ACTION_NONE),
+    mEffectAllowed(nsIDragService::DRAGDROP_ACTION_UNINITIALIZED),
     mCursorState(PR_FALSE),
     mReadOnly(PR_TRUE),
     mIsExternal(PR_TRUE),
@@ -94,11 +95,6 @@ nsDOMDataTransfer::nsDOMDataTransfer(PRUint32 aEventType, PRUint32 aAction)
     mDragImageX(0),
     mDragImageY(0)
 {
-  mEffectAllowed = aAction &
-                   (nsIDragService::DRAGDROP_ACTION_COPY |
-                    nsIDragService::DRAGDROP_ACTION_LINK |
-                    nsIDragService::DRAGDROP_ACTION_MOVE);
-
   CacheExternalFormats();
 }
 
diff --git a/content/events/src/nsDOMDataTransfer.h b/content/events/src/nsDOMDataTransfer.h
index 54cd9acbb6d6..dc4a1bbed5bc 100644
--- a/content/events/src/nsDOMDataTransfer.h
+++ b/content/events/src/nsDOMDataTransfer.h
@@ -93,7 +93,7 @@ protected:
   // that was started without using a data transfer, either an external drag,
   // that is, a drag where the source is another application, or a drag
   // started by calling the drag service directly.
-  nsDOMDataTransfer(PRUint32 aEventType, PRUint32 aAction);
+  nsDOMDataTransfer(PRUint32 aEventType);
 
   // this constructor is used only by the Clone method to copy the fields as
   // needed to a new data transfer.