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diff --git a/js/xpconnect/wrappers/AddonWrapper.h b/js/xpconnect/wrappers/AddonWrapper.h
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+++ b/js/xpconnect/wrappers/AddonWrapper.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim: set ts=8 sts=4 et sw=4 tw=99: */
+/* 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/. */
+
+#ifndef AddonWrapper_h
+#define AddonWrapper_h
+
+#include "mozilla/Attributes.h"
+
+#include "nsID.h"
+
+#include "jswrapper.h"
+
+namespace xpc {
+
+bool
+InterposeProperty(JSContext* cx, JS::HandleObject target, const nsIID* iid, JS::HandleId id,
+                  JS::MutableHandle<JS::PropertyDescriptor> descriptor);
+
+bool
+InterposeCall(JSContext* cx, JS::HandleObject wrapper,
+              const JS::CallArgs& args, bool& done);
+
+template<typename Base>
+class AddonWrapper : public Base {
+  public:
+    explicit constexpr AddonWrapper(unsigned flags) : Base(flags) { }
+
+    virtual bool getOwnPropertyDescriptor(JSContext* cx, JS::Handle<JSObject*> wrapper,
+                                          JS::Handle<jsid> id,
+                                          JS::MutableHandle<JS::PropertyDescriptor> desc) const override;
+    virtual bool defineProperty(JSContext* cx, JS::HandleObject proxy, JS::HandleId id,
+                                JS::Handle<JS::PropertyDescriptor> desc,
+                                JS::ObjectOpResult& result) const override;
+    virtual bool delete_(JSContext* cx, JS::HandleObject proxy, JS::HandleId id,
+                         JS::ObjectOpResult& result) const override;
+    virtual bool get(JSContext* cx, JS::Handle<JSObject*> wrapper, JS::Handle<JS::Value> receiver,
+                     JS::Handle<jsid> id, JS::MutableHandle<JS::Value> vp) const override;
+    virtual bool set(JSContext* cx, JS::HandleObject wrapper, JS::HandleId id, JS::HandleValue v,
+                     JS::HandleValue receiver, JS::ObjectOpResult& result) const override;
+    virtual bool call(JSContext* cx, JS::Handle<JSObject*> wrapper,
+                      const JS::CallArgs& args) const override;
+
+    virtual bool getPropertyDescriptor(JSContext* cx, JS::Handle<JSObject*> wrapper,
+                                       JS::Handle<jsid> id,
+                                       JS::MutableHandle<JS::PropertyDescriptor> desc) const override;
+
+    static const AddonWrapper singleton;
+};
+
+} // namespace xpc
+
+#endif // AddonWrapper_h