1 files changed, 7 insertions, 10 deletions
diff --git a/toolkit/mozapps/extensions/internal/LightweightThemeImageOptimizer.jsm b/toolkit/mozapps/extensions/internal/LightweightThemeImageOptimizer.jsm
index 1e7d6b0d8e..a5bc23ccd3 100644
--- a/toolkit/mozapps/extensions/internal/LightweightThemeImageOptimizer.jsm
+++ b/toolkit/mozapps/extensions/internal/LightweightThemeImageOptimizer.jsm
@@ -120,22 +120,19 @@ var ImageCropper = {
 };
 
 var ImageFile = {
-  read: function ImageFile_read(aURI, aCallback) {
-    this._netUtil.asyncFetch2(
-      aURI,
-      function read_asyncFetch(aInputStream, aStatus, aRequest) {
+  read: function(aURI, aCallback) {
+    this._netUtil.asyncFetch({
+      uri: aURI,
+      loadUsingSystemPrincipal: true,
+      contentPolicyType: Ci.nsIContentPolicy.TYPE_INTERNAL_IMAGE
+    }, function(aInputStream, aStatus, aRequest) {
         if (Components.isSuccessCode(aStatus) && aRequest instanceof Ci.nsIChannel) {
           let channel = aRequest.QueryInterface(Ci.nsIChannel);
           aCallback(aInputStream, channel.contentType);
         } else {
           aCallback();
         }
-      },
-      null,      // aLoadingNode
-      Services.scriptSecurityManager.getSystemPrincipal(),
-      null,      // aTriggeringPrincipal
-      Ci.nsILoadInfo.SEC_NORMAL,
-      Ci.nsIContentPolicy.TYPE_IMAGE);
+      });
   },
 
   write: function ImageFile_write(aFile, aInputStream, aCallback) {