diff --git a/dom/public/idl/base/nsIDOMNavigator.idl b/dom/public/idl/base/nsIDOMNavigator.idl
index 2d26e9a647cb..421f8e16c524 100644
--- a/dom/public/idl/base/nsIDOMNavigator.idl
+++ b/dom/public/idl/base/nsIDOMNavigator.idl
@@ -40,7 +40,7 @@
 
 #include "domstubs.idl"
 
-[scriptable, uuid(a6cf906e-15b3-11d2-932e-00805f8add32)]
+[scriptable, uuid(8758b72b-63d4-4685-b908-4275126410fb)]
 interface nsIDOMNavigator : nsISupports
 {
   readonly attribute DOMString           appCodeName;
@@ -58,6 +58,7 @@ interface nsIDOMNavigator : nsISupports
   readonly attribute DOMString           securityPolicy;
   readonly attribute DOMString           userAgent;
   readonly attribute boolean             cookieEnabled;
+  readonly attribute boolean             onLine;
 
   boolean                   javaEnabled();
   boolean                   taintEnabled();
diff --git a/dom/src/base/nsGlobalWindow.cpp b/dom/src/base/nsGlobalWindow.cpp
index 23d742e1eb41..111443b81638 100644
--- a/dom/src/base/nsGlobalWindow.cpp
+++ b/dom/src/base/nsGlobalWindow.cpp
@@ -6215,6 +6215,22 @@ NavigatorImpl::GetCookieEnabled(PRBool *aCookieEnabled)
   return rv;
 }
 
+NS_IMETHODIMP
+NavigatorImpl::GetOnLine(PRBool* aOnline)
+{
+  NS_PRECONDITION(aOnline, "Null out param");
+  
+  *aOnline = PR_FALSE;  // No ioservice would mean this is the case
+  
+  nsCOMPtr<nsIIOService> ios(do_GetService(NS_IOSERVICE_CONTRACTID));
+  if (ios) {
+    ios->GetOffline(aOnline);
+    *aOnline = !*aOnline;
+  }
+  
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 NavigatorImpl::JavaEnabled(PRBool *aReturn)
 {