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diff --git a/dom/webidl/ExtensionPort.webidl b/dom/webidl/ExtensionPort.webidl
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+++ b/dom/webidl/ExtensionPort.webidl
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+/* -*- Mode: IDL; 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/.
+ *
+ * You are granted a license to use, reproduce and create derivative works of
+ * this document.
+ *
+ * This IDL file is related to the WebExtensions browser.runtime's Port.
+ *
+ * More info about generating webidl API bindings for WebExtensions API at:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html
+ *
+ * A short summary of the special setup used by these WebIDL files (meant to aid
+ * webidl peers reviews and sign-offs) is available in the following section:
+ *
+ * https://firefox-source-docs.mozilla.org/toolkit/components/extensions/webextensions/webidl_bindings.html#review-process-on-changes-to-webidl-definitions
+ */
+
+[Exposed=(ServiceWorker), LegacyNoInterfaceObject]
+interface ExtensionPort {
+  [Replaceable]
+  readonly attribute DOMString name;
+  [Replaceable]
+  readonly attribute any sender;
+  [Replaceable]
+  readonly attribute any error;
+
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined disconnect();
+  [Throws, WebExtensionStub="NoReturn"]
+  undefined postMessage(any message);
+
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onDisconnect;
+  [Replaceable, SameObject]
+  readonly attribute ExtensionEventManager onMessage;
+};
+
+// Dictionary used by ExtensionAPIRequestForwarder and ExtensionCallabck to receive from the
+// mozIExtensionAPIRequestHandler an internal description of a runtime.Port (and then used in
+// the webidl implementation to create an ExtensionPort instance).
+[GenerateInit]
+dictionary ExtensionPortDescriptor {
+  required DOMString portId;
+  DOMString name = "";
+};