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diff --git a/dom/chrome-webidl/JSProcessActor.webidl b/dom/chrome-webidl/JSProcessActor.webidl
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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/. */
+
+/**
+ * An actor architecture designed to allow compositional parent/content
+ * communications. The lifetime of a JSProcessActor{Child, Parent} is the `ContentParent`
+ * (for the parent-side) / `ContentChild` (for the child-side).
+ */
+
+interface nsISupports;
+
+/**
+ * Base class for parent-side actor.
+ */
+[ChromeOnly, Exposed=Window]
+interface JSProcessActorParent {
+  [ChromeOnly]
+  constructor();
+
+  readonly attribute nsIDOMProcessParent manager;
+};
+JSProcessActorParent includes JSActor;
+
+[ChromeOnly, Exposed=Window]
+interface JSProcessActorChild {
+  [ChromeOnly]
+  constructor();
+
+  readonly attribute nsIDOMProcessChild manager;
+};
+JSProcessActorChild includes JSActor;
+
+
+/**
+ * Used by `ChromeUtils.registerProcessActor()` to register actors.
+ */
+dictionary ProcessActorOptions {
+  /**
+   * An array of remote type which restricts the actor is allowed to instantiate
+   * in specific process type. If this is defined, the prefix of process type
+   * matches the remote type by prefix match is allowed to instantiate, ex: if
+   * Fission is enabled, the prefix of process type will be `webIsolated`, it
+   * can prefix match remote type either `web` or `webIsolated`. If not passed,
+   * all content processes are allowed to instantiate the actor.
+   */
+  sequence<UTF8String> remoteTypes;
+
+  /**
+   * If this is set to `true`, allow this actor to be created for the parent
+   * process.
+   */
+  boolean includeParent = false;
+
+  /** This fields are used for configuring individual sides of the actor. */
+  ProcessActorSidedOptions parent;
+  ProcessActorChildOptions child;
+};
+
+dictionary ProcessActorSidedOptions {
+  /**
+   * The JSM path which should be loaded for the actor on this side.
+   *
+   * Mutually exclusive with `esModuleURI`.
+   *
+   * If neither this nor `esModuleURI` is passed, the specified side cannot receive
+   * messages, but may send them using `sendAsyncMessage` or `sendQuery`.
+   */
+  ByteString moduleURI;
+
+  /**
+   * The ESM path which should be loaded for the actor on this side.
+   *
+   * Mutually exclusive with `moduleURI`.
+   *
+   * If neither this nor `moduleURI` is passed, the specified side cannot
+   * receive messages, but may send them using `sendAsyncMessage` or
+   * `sendQuery`.
+   */
+  ByteString esModuleURI;
+};
+
+dictionary ProcessActorChildOptions : ProcessActorSidedOptions {
+  /**
+   * An array of observer topics to listen to. An observer will be added for each
+   * topic in the list.
+   *
+   * Unlike for JSWindowActor, observers are always invoked, and do not need to
+   * pass an inner or outer window as subject.
+   */
+  sequence<ByteString> observers;
+};