--- a/embedding/components/webbrowserpersist/nsWebBrowserPersist.cpp
+++ b/embedding/components/webbrowserpersist/nsWebBrowserPersist.cpp
@@ -1195,19 +1195,25 @@ nsresult nsWebBrowserPersist::SaveURIInt
         {
             // Assume a plain cache key
             cacheKey = aCacheKey;
         }
     }
 
     // Open a channel to the URI
     nsCOMPtr<nsIChannel> inputChannel;
-    rv = NS_NewChannel(getter_AddRefs(inputChannel), aURI,
-            nullptr, nullptr, static_cast<nsIInterfaceRequestor*>(this),
-            loadFlags);
+    rv = NS_NewChannel(getter_AddRefs(inputChannel),
+                       aURI,
+                       nsContentUtils::GetSystemPrincipal(),
+                       nsILoadInfo::SEC_NORMAL,
+                       nsIContentPolicy::TYPE_OTHER,
+                       nullptr,  // aChannelPolicy
+                       nullptr,  // aLoadGroup
+                       static_cast<nsIInterfaceRequestor*>(this),
+                       loadFlags);
 
     nsCOMPtr<nsIPrivateBrowsingChannel> pbChannel = do_QueryInterface(inputChannel);
     if (pbChannel)
     {
         pbChannel->SetPrivate(aIsPrivate);
     }
 
     if (NS_FAILED(rv) || inputChannel == nullptr)