1 files changed, 39 insertions, 0 deletions
diff --git a/toolkit/components/addoncompat/defaultShims.js b/toolkit/components/addoncompat/defaultShims.js
new file mode 100644
index 000000000..a786efed7
--- /dev/null
+++ b/toolkit/components/addoncompat/defaultShims.js
@@ -0,0 +1,39 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const Cu = Components.utils;
+const Ci = Components.interfaces;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+/**
+ * Using multiprocessShims is optional, and if an add-on is e10s compatible it should not
+ * use it. But in some cases we still want to use the interposition service for various
+ * features so we have a default shim service.
+ */
+
+function DefaultInterpositionService() {
+}
+
+DefaultInterpositionService.prototype = {
+  classID: Components.ID("{50bc93ce-602a-4bef-bf3a-61fc749c4caf}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIAddonInterposition, Ci.nsISupportsWeakReference]),
+
+  getWhitelist: function() {
+    return [];
+  },
+
+  interposeProperty: function(addon, target, iid, prop) {
+    return null;
+  },
+
+  interposeCall: function(addonId, originalFunc, originalThis, args) {
+    args.splice(0, 0, addonId);
+    return originalFunc.apply(originalThis, args);
+  },
+};
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([DefaultInterpositionService]);