diff --git a/extensions/cookie/nsPermissionManager.cpp b/extensions/cookie/nsPermissionManager.cpp
index d53de885d3ce..99561abcdd10 100644
--- a/extensions/cookie/nsPermissionManager.cpp
+++ b/extensions/cookie/nsPermissionManager.cpp
@@ -1895,18 +1895,16 @@ nsPermissionManager::ImportDefaults()
     return NS_OK;
   }
 
-  nsresult rv;
-  nsCOMPtr<nsIIOService> ioservice =
-    do_GetService("@mozilla.org/network/io-service;1", &rv);
-  NS_ENSURE_SUCCESS(rv, rv);
-
   nsCOMPtr<nsIURI> defaultsURI;
-  rv = NS_NewURI(getter_AddRefs(defaultsURI), defaultsURL,
-                 nullptr, nullptr, ioservice);
+  nsresult rv = NS_NewURI(getter_AddRefs(defaultsURI), defaultsURL);
   NS_ENSURE_SUCCESS(rv, rv);
 
   nsCOMPtr<nsIChannel> channel;
-  rv = ioservice->NewChannelFromURI(defaultsURI, getter_AddRefs(channel));
+  rv = NS_NewChannel(getter_AddRefs(channel),
+                     defaultsURI,
+                     nsContentUtils::GetSystemPrincipal(),
+                     nsILoadInfo::SEC_NORMAL,
+                     nsIContentPolicy::TYPE_OTHER);
   NS_ENSURE_SUCCESS(rv, rv);
 
   nsCOMPtr<nsIInputStream> inputStream;
diff --git a/extensions/pref/autoconfig/src/nsReadConfig.cpp b/extensions/pref/autoconfig/src/nsReadConfig.cpp
index c2621321f073..85a0c148ad72 100644
--- a/extensions/pref/autoconfig/src/nsReadConfig.cpp
+++ b/extensions/pref/autoconfig/src/nsReadConfig.cpp
@@ -24,6 +24,7 @@
 #include "nsCRT.h"
 #include "nspr.h"
 #include "nsXULAppAPI.h"
+#include "nsContentUtils.h"
 
 extern PRLogModuleInfo *MCD;
 
@@ -253,26 +254,23 @@ nsresult nsReadConfig::openAndEvaluateJSFile(const char *aFileName, int32_t obsc
             return rv;
 
     } else {
-        nsCOMPtr<nsIIOService> ioService = do_GetIOService(&rv);
-        if (NS_FAILED(rv)) 
-            return rv;
-
         nsAutoCString location("resource://gre/defaults/autoconfig/");
         location += aFileName;
 
         nsCOMPtr<nsIURI> uri;
-        rv = ioService->NewURI(location, nullptr, nullptr, getter_AddRefs(uri));
-        if (NS_FAILED(rv))
-            return rv;
+        rv = NS_NewURI(getter_AddRefs(uri), location);
+        NS_ENSURE_SUCCESS(rv, rv);
 
         nsCOMPtr<nsIChannel> channel;
-        rv = ioService->NewChannelFromURI(uri, getter_AddRefs(channel));
-        if (NS_FAILED(rv))
-            return rv;
+        rv = NS_NewChannel(getter_AddRefs(channel),
+                           uri,
+                           nsContentUtils::GetSystemPrincipal(),
+                           nsILoadInfo::SEC_NORMAL,
+                           nsIContentPolicy::TYPE_OTHER);
+        NS_ENSURE_SUCCESS(rv, rv);
 
         rv = channel->Open(getter_AddRefs(inStr));
-        if (NS_FAILED(rv)) 
-            return rv;
+        NS_ENSURE_SUCCESS(rv, rv);
     }
 
     uint64_t fs64;