--- a/dom/performance/PerformanceMainThread.cpp
+++ b/dom/performance/PerformanceMainThread.cpp
@@ -1,16 +1,17 @@
 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "PerformanceMainThread.h"
 #include "PerformanceNavigation.h"
+#include "nsICacheInfoChannel.h"
 
 namespace mozilla {
 namespace dom {
 
 NS_IMPL_CYCLE_COLLECTION_CLASS(PerformanceMainThread)
 
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(PerformanceMainThread,
                                                 Performance)
@@ -160,16 +161,27 @@ PerformanceMainThread::AddEntry(nsIHttpC
 
     // The PerformanceResourceTiming object will use the PerformanceTiming
     // object to get all the required timings.
     RefPtr<PerformanceResourceTiming> performanceEntry =
       new PerformanceResourceTiming(performanceTiming, this, entryName);
 
     nsAutoCString protocol;
     channel->GetProtocolVersion(protocol);
+
+    // If this is a local fetch, nextHopProtocol should be set to empty string.
+    nsCOMPtr<nsICacheInfoChannel> cachedChannel = do_QueryInterface(channel);
+    if (cachedChannel) {
+      bool isFromCache;
+      if (NS_SUCCEEDED(cachedChannel->IsFromCache(&isFromCache))
+          && isFromCache) {
+        protocol.Truncate();
+      }
+    }
+
     performanceEntry->SetNextHopProtocol(NS_ConvertUTF8toUTF16(protocol));
 
     uint64_t encodedBodySize = 0;
     channel->GetEncodedBodySize(&encodedBodySize);
     performanceEntry->SetEncodedBodySize(encodedBodySize);
 
     uint64_t transferSize = 0;
     channel->GetTransferSize(&transferSize);