diff --git a/netwerk/base/nsLoadGroup.cpp b/netwerk/base/nsLoadGroup.cpp
index 1208649c9378..d924337f25ae 100644
--- a/netwerk/base/nsLoadGroup.cpp
+++ b/netwerk/base/nsLoadGroup.cpp
@@ -825,7 +825,13 @@ nsLoadGroup::SetUserAgentOverrideCache(const nsACString & aUserAgentOverrideCach
 void
 nsLoadGroup::TelemetryReport()
 {
-    if (mDefaultLoadIsTimed) {
+    nsresult defaultStatus = NS_ERROR_INVALID_ARG;
+    // We should only report HTTP_PAGE_* telemetry if the defaultRequest was
+    // actually successful.
+    if (mDefaultLoadRequest) {
+        mDefaultLoadRequest->GetStatus(&defaultStatus);
+    }
+    if (mDefaultLoadIsTimed && NS_SUCCEEDED(defaultStatus)) {
         Telemetry::Accumulate(Telemetry::HTTP_REQUEST_PER_PAGE, mTimedRequests);
         if (mTimedRequests) {
             Telemetry::Accumulate(Telemetry::HTTP_REQUEST_PER_PAGE_FROM_CACHE,
diff --git a/netwerk/protocol/http/NullHttpChannel.cpp b/netwerk/protocol/http/NullHttpChannel.cpp
index 59da1a36b2ea..3c462457f702 100644
--- a/netwerk/protocol/http/NullHttpChannel.cpp
+++ b/netwerk/protocol/http/NullHttpChannel.cpp
@@ -552,7 +552,8 @@ NullHttpChannel::GetIsDocument(bool *aIsDocument)
 NS_IMETHODIMP
 NullHttpChannel::GetTimingEnabled(bool *aTimingEnabled)
 {
-  *aTimingEnabled = true;
+  // We don't want to report timing for null channels.
+  *aTimingEnabled = false;
   return NS_OK;
 }