diff --git a/mozilla/docshell/base/nsDocShell.cpp b/mozilla/docshell/base/nsDocShell.cpp
index aa51d969387..0fafce2ba51 100644
--- a/mozilla/docshell/base/nsDocShell.cpp
+++ b/mozilla/docshell/base/nsDocShell.cpp
@@ -673,7 +673,7 @@ nsDocShell::LoadURI(nsIURI * aURI,
                     PRUint32 aLoadFlags,
                     PRBool aFirstParty)
 {
-    if (mFiredUnloadEvent) {
+    if (!IsNavigationAllowed()) {
       return NS_OK; // JS may not handle returning of an error code
     }
     nsresult rv;