diff --git a/netwerk/base/LoadInfo.cpp b/netwerk/base/LoadInfo.cpp
index 9b7747dbc340..80be5951f468 100644
--- a/netwerk/base/LoadInfo.cpp
+++ b/netwerk/base/LoadInfo.cpp
@@ -83,6 +83,21 @@ LoadInfo::LoadInfo(nsIPrincipal* aLoadingPrincipal,
   }
 }
 
+LoadInfo::LoadInfo(const LoadInfo& rhs)
+  : mLoadingPrincipal(rhs.mLoadingPrincipal)
+  , mTriggeringPrincipal(rhs.mTriggeringPrincipal)
+  , mLoadingContext(rhs.mLoadingContext)
+  , mSecurityFlags(rhs.mSecurityFlags)
+  , mContentPolicyType(rhs.mContentPolicyType)
+  , mUpgradeInsecureRequests(rhs.mUpgradeInsecureRequests)
+  , mInnerWindowID(rhs.mInnerWindowID)
+  , mOuterWindowID(rhs.mOuterWindowID)
+  , mParentOuterWindowID(rhs.mParentOuterWindowID)
+  , mEnforceSecurity(false)
+  , mInitialSecurityCheckDone(false)
+{
+}
+
 LoadInfo::LoadInfo(nsIPrincipal* aLoadingPrincipal,
                    nsIPrincipal* aTriggeringPrincipal,
                    nsSecurityFlags aSecurityFlags,
@@ -117,6 +132,13 @@ LoadInfo::~LoadInfo()
 
 NS_IMPL_ISUPPORTS(LoadInfo, nsILoadInfo)
 
+already_AddRefed<nsILoadInfo>
+LoadInfo::Clone() const
+{
+  nsRefPtr<LoadInfo> copy(new LoadInfo(*this));
+  return copy.forget();
+}
+
 NS_IMETHODIMP
 LoadInfo::GetLoadingPrincipal(nsIPrincipal** aLoadingPrincipal)
 {
diff --git a/netwerk/base/LoadInfo.h b/netwerk/base/LoadInfo.h
index 799e8f144b72..cad67a47f8d2 100644
--- a/netwerk/base/LoadInfo.h
+++ b/netwerk/base/LoadInfo.h
@@ -50,6 +50,8 @@ public:
            nsSecurityFlags aSecurityFlags,
            nsContentPolicyType aContentPolicyType);
 
+  already_AddRefed<nsILoadInfo> Clone() const;
+
 private:
   // private constructor that is only allowed to be called from within
   // HttpChannelParent and FTPChannelParent declared as friends undeneath.
@@ -66,6 +68,7 @@ private:
            bool aEnforceSecurity,
            bool aInitialSecurityCheckDone,
            nsTArray<nsCOMPtr<nsIPrincipal>>& aRedirectChain);
+  LoadInfo(const LoadInfo& rhs);
 
   friend nsresult
   mozilla::ipc::LoadInfoArgsToLoadInfo(
diff --git a/netwerk/protocol/http/nsCORSListenerProxy.cpp b/netwerk/protocol/http/nsCORSListenerProxy.cpp
index 6b154a90fe36..8bf4f132d5d1 100644
--- a/netwerk/protocol/http/nsCORSListenerProxy.cpp
+++ b/netwerk/protocol/http/nsCORSListenerProxy.cpp
@@ -41,6 +41,7 @@
 #include "nsINetworkInterceptController.h"
 #include "nsNullPrincipal.h"
 #include "nsICorsPreflightCallback.h"
+#include "mozilla/LoadInfo.h"
 #include <algorithm>
 
 using namespace mozilla;
@@ -1310,12 +1311,15 @@ nsCORSListenerProxy::StartCORSPreflight(nsIChannel* aRequestChannel,
   nsresult rv = NS_GetFinalChannelURI(aRequestChannel, getter_AddRefs(uri));
   NS_ENSURE_SUCCESS(rv, rv);
 
-  nsCOMPtr<nsILoadInfo> loadInfo = aRequestChannel->GetLoadInfo();
-  MOZ_ASSERT(loadInfo, "can not perform CORS preflight without a loadInfo");
-  if (!loadInfo) {
+  nsCOMPtr<nsILoadInfo> originalLoadInfo = aRequestChannel->GetLoadInfo();
+  MOZ_ASSERT(originalLoadInfo, "can not perform CORS preflight without a loadInfo");
+  if (!originalLoadInfo) {
     return NS_ERROR_FAILURE;
   }
 
+  nsCOMPtr<nsILoadInfo> loadInfo = static_cast<mozilla::LoadInfo*>
+    (originalLoadInfo.get())->Clone();
+
   nsSecurityFlags securityMode = loadInfo->GetSecurityMode();
 
   MOZ_ASSERT(securityMode == 0 ||