diff --git a/mozilla/docshell/base/nsDocShell.cpp b/mozilla/docshell/base/nsDocShell.cpp
index d2c3726b805..87427bc9d10 100644
--- a/mozilla/docshell/base/nsDocShell.cpp
+++ b/mozilla/docshell/base/nsDocShell.cpp
@@ -66,6 +66,7 @@
 #include "nsIWebBrowserChrome.h"
 #include "nsPoint.h"
 #include "nsGfxCIID.h"
+#include "nsIObserverService.h"
 #include "nsIPrompt.h"
 #include "nsIAuthPrompt.h"
 #include "nsTextFormatter.h"
@@ -7847,13 +7848,27 @@ NS_IMETHODIMP nsDocShell::MakeEditable(PRBool inWaitForUriLoad)
 nsresult
 nsDocShell::AddToGlobalHistory(nsIURI * aURI, PRBool aRedirect, nsIURI * aReferrer)
 {
-    if (mItemType != typeContent)
+    if (mItemType != typeContent || !mGlobalHistory)
         return NS_OK;
 
-    if (!mGlobalHistory)
-        return NS_OK;
+    PRBool visited;
+    nsresult rv = mGlobalHistory->IsVisited(aURI, &visited);
+    if (NS_FAILED(rv))
+        return rv;
+    
+    rv = mGlobalHistory->AddURI(aURI, aRedirect, !IsFrame(), aReferrer);
+    if (NS_FAILED(rv))
+        return rv;
 
-    return mGlobalHistory->AddURI(aURI, aRedirect, !IsFrame(), aReferrer);
+    if (!visited) {
+        nsCOMPtr<nsIObserverService> obsService =
+            do_GetService("@mozilla.org/observer-service;1");
+        if (obsService) {
+            obsService->NotifyObservers(aURI, NS_LINK_VISITED_EVENT_TOPIC, nsnull);
+        }
+    }
+
+    return NS_OK;
 }
 
 //*****************************************************************************