diff --git a/dom/performance/PerformanceTiming.h b/dom/performance/PerformanceTiming.h
index 435e1bca1a..74b691496b 100755
--- a/dom/performance/PerformanceTiming.h
+++ b/dom/performance/PerformanceTiming.h
@@ -125,7 +125,7 @@ public:
 
   DOMTimeMilliSec UnloadEventStart()
   {
-    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+    if (!nsContentUtils::IsPerformanceTimingEnabled() || !mAllRedirectsSameOrigin) {
       return 0;
     }
     return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetUnloadEventStart());
@@ -133,7 +133,7 @@ public:
 
   DOMTimeMilliSec UnloadEventEnd()
   {
-    if (!nsContentUtils::IsPerformanceTimingEnabled()) {
+    if (!nsContentUtils::IsPerformanceTimingEnabled() || !mAllRedirectsSameOrigin) {
       return 0;
     }
     return TimerClamping::ReduceMsTimeValue(GetDOMTiming()->GetUnloadEventEnd());