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From 83364c747c421b191f9d4012896a9e5a1d5223ad Mon Sep 17 00:00:00 2001
From: Kyle Huey <khuey@kylehuey.com>
Date: Fri, 20 Mar 2015 19:15:13 -0700
Subject: [PATCH] Bug 1144988. r=bz a=lmandel

---
 docshell/base/nsDocShell.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/docshell/base/nsDocShell.cpp b/docshell/base/nsDocShell.cpp
index 4cddcef..bdf88a5cf 100644
--- a/docshell/base/nsDocShell.cpp
+++ b/docshell/base/nsDocShell.cpp
@@ -1322,9 +1322,10 @@ nsDocShell::LoadURI(nsIURI * aURI,
     
     // Note: we allow loads to get through here even if mFiredUnloadEvent is
     // true; that case will get handled in LoadInternal or LoadHistoryEntry.
-    if (IsPrintingOrPP()) {
+    if (IsPrintingOrPP() || mBlockNavigation) {
       return NS_OK; // JS may not handle returning of an error code
     }
+
     nsCOMPtr<nsIURI> referrer;
     nsCOMPtr<nsIInputStream> postStream;
     nsCOMPtr<nsIInputStream> headersStream;
-- 
2.2.1