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diff --git a/dom/base/ChromeMessageBroadcaster.h b/dom/base/ChromeMessageBroadcaster.h
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+++ b/dom/base/ChromeMessageBroadcaster.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 mozilla_dom_ChromeMessageBroadcaster_h
+#define mozilla_dom_ChromeMessageBroadcaster_h
+
+#include "mozilla/dom/MessageBroadcaster.h"
+
+namespace mozilla::dom {
+
+/**
+ * Implementation for the WebIDL ChromeMessageBroadcaster interface. Used for
+ * window and group message managers.
+ */
+class ChromeMessageBroadcaster final : public MessageBroadcaster {
+ public:
+  explicit ChromeMessageBroadcaster(MessageManagerFlags aFlags)
+      : ChromeMessageBroadcaster(nullptr, aFlags) {
+    MOZ_ASSERT(!(aFlags & ~(MessageManagerFlags::MM_GLOBAL |
+                            MessageManagerFlags::MM_OWNSCALLBACK)));
+  }
+  explicit ChromeMessageBroadcaster(MessageBroadcaster* aParentManager)
+      : ChromeMessageBroadcaster(aParentManager, MessageManagerFlags::MM_NONE) {
+  }
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  // FrameScriptLoader
+  void LoadFrameScript(const nsAString& aUrl, bool aAllowDelayedLoad,
+                       bool aRunInGlobalScope, mozilla::ErrorResult& aError) {
+    LoadScript(aUrl, aAllowDelayedLoad, aRunInGlobalScope, aError);
+  }
+  void RemoveDelayedFrameScript(const nsAString& aURL) {
+    RemoveDelayedScript(aURL);
+  }
+  void GetDelayedFrameScripts(JSContext* aCx,
+                              nsTArray<nsTArray<JS::Value>>& aScripts,
+                              mozilla::ErrorResult& aError) {
+    GetDelayedScripts(aCx, aScripts, aError);
+  }
+
+ private:
+  ChromeMessageBroadcaster(MessageBroadcaster* aParentManager,
+                           MessageManagerFlags aFlags)
+      : MessageBroadcaster(aParentManager,
+                           aFlags | MessageManagerFlags::MM_CHROME) {}
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_ChromeMessageBroadcaster_h