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diff --git a/toolkit/mozapps/extensions/AddonManagerStartup-inlines.h b/toolkit/mozapps/extensions/AddonManagerStartup-inlines.h
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+++ b/toolkit/mozapps/extensions/AddonManagerStartup-inlines.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 AddonManagerStartup_inlines_h
+#define AddonManagerStartup_inlines_h
+
+#include <utility>
+
+#include "js/Array.h"  // JS::GetArrayLength, JS::IsArrayObject
+#include "jsapi.h"
+#include "mozilla/Maybe.h"
+#include "nsJSUtils.h"
+
+namespace mozilla {
+
+class ArrayIterElem;
+class PropertyIterElem;
+
+/*****************************************************************************
+ * Object iterator base classes
+ *****************************************************************************/
+
+template <class T, class PropertyType>
+class MOZ_STACK_CLASS BaseIter {
+ public:
+  typedef T SelfType;
+
+  PropertyType begin() const { return PropertyType(Self()); }
+
+  PropertyType end() const {
+    PropertyType elem(Self());
+    return elem.End();
+  }
+
+  void* Context() const { return mContext; }
+
+ protected:
+  BaseIter(JSContext* cx, JS::HandleObject object, void* context = nullptr)
+      : mCx(cx), mObject(object), mContext(context) {}
+
+  const SelfType& Self() const { return *static_cast<const SelfType*>(this); }
+  SelfType& Self() { return *static_cast<SelfType*>(this); }
+
+  JSContext* mCx;
+
+  JS::HandleObject mObject;
+
+  void* mContext;
+};
+
+template <class T, class IterType>
+class MOZ_STACK_CLASS BaseIterElem {
+ public:
+  typedef T SelfType;
+
+  explicit BaseIterElem(const IterType& iter, uint32_t index = 0)
+      : mIter(iter), mIndex(index) {}
+
+  uint32_t Length() const { return mIter.Length(); }
+
+  JS::Value Value() {
+    JS::RootedValue value(mIter.mCx, JS::UndefinedValue());
+
+    auto& self = Self();
+    if (!self.GetValue(&value)) {
+      JS_ClearPendingException(mIter.mCx);
+    }
+
+    return value;
+  }
+
+  SelfType& operator*() { return Self(); }
+
+  SelfType& operator++() {
+    MOZ_ASSERT(mIndex < Length());
+    mIndex++;
+    return Self();
+  }
+
+  bool operator!=(const SelfType& other) const {
+    return &mIter != &other.mIter || mIndex != other.mIndex;
+  }
+
+  SelfType End() const {
+    SelfType end(mIter);
+    end.mIndex = Length();
+    return end;
+  }
+
+  void* Context() const { return mIter.Context(); }
+
+ protected:
+  const SelfType& Self() const { return *static_cast<const SelfType*>(this); }
+  SelfType& Self() { return *static_cast<SelfType*>(this); }
+
+  const IterType& mIter;
+
+  uint32_t mIndex;
+};
+
+/*****************************************************************************
+ * Property iteration
+ *****************************************************************************/
+
+class MOZ_STACK_CLASS PropertyIter
+    : public BaseIter<PropertyIter, PropertyIterElem> {
+  friend class PropertyIterElem;
+  friend class BaseIterElem<PropertyIterElem, PropertyIter>;
+
+ public:
+  PropertyIter(JSContext* cx, JS::HandleObject object, void* context = nullptr)
+      : BaseIter(cx, object, context), mIds(cx, JS::IdVector(cx)) {
+    if (!JS_Enumerate(cx, object, &mIds)) {
+      JS_ClearPendingException(cx);
+    }
+  }
+
+  PropertyIter(const PropertyIter& other)
+      : PropertyIter(other.mCx, other.mObject, other.mContext) {}
+
+  PropertyIter& operator=(const PropertyIter& other) {
+    MOZ_ASSERT(other.mObject == mObject);
+    mCx = other.mCx;
+    mContext = other.mContext;
+
+    mIds.clear();
+    if (!JS_Enumerate(mCx, mObject, &mIds)) {
+      JS_ClearPendingException(mCx);
+    }
+    return *this;
+  }
+
+  int32_t Length() const { return mIds.length(); }
+
+ protected:
+  JS::Rooted<JS::IdVector> mIds;
+};
+
+class MOZ_STACK_CLASS PropertyIterElem
+    : public BaseIterElem<PropertyIterElem, PropertyIter> {
+  friend class BaseIterElem<PropertyIterElem, PropertyIter>;
+
+ public:
+  using BaseIterElem::BaseIterElem;
+
+  PropertyIterElem(const PropertyIterElem& other)
+      : BaseIterElem(other.mIter, other.mIndex) {}
+
+  jsid Id() {
+    MOZ_ASSERT(mIndex < mIter.mIds.length());
+
+    return mIter.mIds[mIndex];
+  }
+
+  const nsAString& Name() {
+    if (mName.isNothing()) {
+      mName.emplace();
+      mName.ref().init(mIter.mCx, Id());
+    }
+    return mName.ref();
+  }
+
+  JSContext* Cx() { return mIter.mCx; }
+
+ protected:
+  bool GetValue(JS::MutableHandleValue value) {
+    MOZ_ASSERT(mIndex < Length());
+    JS::Rooted<jsid> id(mIter.mCx, Id());
+
+    return JS_GetPropertyById(mIter.mCx, mIter.mObject, id, value);
+  }
+
+ private:
+  Maybe<nsAutoJSString> mName;
+};
+
+/*****************************************************************************
+ * Array iteration
+ *****************************************************************************/
+
+class MOZ_STACK_CLASS ArrayIter : public BaseIter<ArrayIter, ArrayIterElem> {
+  friend class ArrayIterElem;
+  friend class BaseIterElem<ArrayIterElem, ArrayIter>;
+
+ public:
+  ArrayIter(JSContext* cx, JS::HandleObject object)
+      : BaseIter(cx, object), mLength(0) {
+    bool isArray;
+    if (!JS::IsArrayObject(cx, object, &isArray) || !isArray) {
+      JS_ClearPendingException(cx);
+      return;
+    }
+
+    if (!JS::GetArrayLength(cx, object, &mLength)) {
+      JS_ClearPendingException(cx);
+    }
+  }
+
+  uint32_t Length() const { return mLength; }
+
+ private:
+  uint32_t mLength;
+};
+
+class MOZ_STACK_CLASS ArrayIterElem
+    : public BaseIterElem<ArrayIterElem, ArrayIter> {
+  friend class BaseIterElem<ArrayIterElem, ArrayIter>;
+
+ public:
+  using BaseIterElem::BaseIterElem;
+
+  ArrayIterElem(const ArrayIterElem& other)
+      : BaseIterElem(other.mIter, other.mIndex) {}
+
+ protected:
+  bool GetValue(JS::MutableHandleValue value) {
+    MOZ_ASSERT(mIndex < Length());
+    return JS_GetElement(mIter.mCx, mIter.mObject, mIndex, value);
+  }
+};
+
+}  // namespace mozilla
+
+#endif  // AddonManagerStartup_inlines_h