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diff --git a/dom/chrome-webidl/WindowGlobalActors.webidl b/dom/chrome-webidl/WindowGlobalActors.webidl
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+++ b/dom/chrome-webidl/WindowGlobalActors.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/. */
+
+interface Principal;
+interface URI;
+interface nsIDocShell;
+interface RemoteTab;
+interface nsIDOMProcessParent;
+
+[Exposed=Window, ChromeOnly]
+interface WindowContext {
+  readonly attribute BrowsingContext? browsingContext;
+
+  readonly attribute WindowGlobalChild? windowGlobalChild; // in-process only
+
+  readonly attribute unsigned long long innerWindowId;
+
+  readonly attribute WindowContext? parentWindowContext;
+
+  readonly attribute WindowContext topWindowContext;
+
+  readonly attribute boolean isInProcess;
+
+  // True if this WindowContext is currently frozen in the BFCache.
+  readonly attribute boolean isInBFCache;
+
+  // True if this window has registered a "beforeunload" event handler.
+  readonly attribute boolean hasBeforeUnload;
+
+  // True if the principal of this window is for a local ip address.
+  readonly attribute boolean isLocalIP;
+
+  /**
+   * Partially determines whether script execution is allowed in this
+   * BrowsingContext. Script execution will be permitted only if this
+   * attribute is true and script execution is allowed in the owner
+   * BrowsingContext.
+   *
+   * May only be set in the context's owning process.
+   */
+  [SetterThrows] attribute boolean allowJavascript;
+};
+
+// Keep this in sync with nsIContentViewer::PermitUnloadAction.
+enum PermitUnloadAction {
+  "prompt",
+  "dontUnload",
+  "unload",
+};
+
+[Exposed=Window, ChromeOnly]
+interface WindowGlobalParent : WindowContext {
+  readonly attribute boolean isClosed;
+
+  readonly attribute boolean isCurrentGlobal;
+
+  readonly attribute unsigned long long outerWindowId;
+  readonly attribute unsigned long long contentParentId;
+
+  readonly attribute long osPid;
+
+  // A WindowGlobalParent is the root in its process if it has no parent, or its
+  // embedder is in a different process.
+  readonly attribute boolean isProcessRoot;
+
+  // Is the document loaded in this WindowGlobalParent the initial document
+  // implicitly created while "creating a new browsing context".
+  // https://html.spec.whatwg.org/multipage/browsers.html#creating-a-new-browsing-context
+  readonly attribute boolean isInitialDocument;
+
+  readonly attribute FrameLoader? rootFrameLoader; // Embedded (browser) only
+
+  readonly attribute WindowGlobalChild? childActor; // in-process only
+
+  // Checks for any WindowContexts with "beforeunload" listeners in this
+  // WindowGlobal's subtree. If any exist, a "beforeunload" event is
+  // dispatched to them. If any of those request to block the navigation,
+  // displays a prompt to the user. Returns a boolean which resolves to true
+  // if the navigation should be allowed.
+  //
+  // If `timeout` is greater than 0, it is the maximum time (in milliseconds)
+  // we will wait for a child process to respond with a request to block
+  // navigation before proceeding. If the user needs to be prompted, however,
+  // the promise will not resolve until the user has responded, regardless of
+  // the timeout.
+  [NewObject]
+  Promise<boolean> permitUnload(optional PermitUnloadAction action = "prompt",
+                                optional unsigned long timeout = 0);
+
+  // Information about the currently loaded document.
+  readonly attribute Principal documentPrincipal;
+  readonly attribute Principal documentStoragePrincipal;
+  readonly attribute Principal? contentBlockingAllowListPrincipal;
+  readonly attribute URI? documentURI;
+  readonly attribute DOMString documentTitle;
+  readonly attribute nsICookieJarSettings? cookieJarSettings;
+
+  // True if the the currently loaded document is in fullscreen.
+  attribute boolean fullscreen;
+
+  // Bit mask containing content blocking events that are recorded in
+  // the document's content blocking log.
+  readonly attribute unsigned long contentBlockingEvents;
+
+  // String containing serialized content blocking log.
+  readonly attribute DOMString contentBlockingLog;
+
+  // DOM Process which this window was loaded in. Will be either InProcessParent
+  // for windows loaded in the parent process, or ContentParent for windows
+  // loaded in the content process.
+  readonly attribute nsIDOMProcessParent? domProcess;
+
+  static WindowGlobalParent? getByInnerWindowId(unsigned long long innerWindowId);
+
+  /**
+   * Get or create the JSWindowActor with the given name.
+   *
+   * See WindowActorOptions from JSWindowActor.webidl for details on how to
+   * customize actor creation.
+   */
+  [Throws]
+  JSWindowActorParent getActor(UTF8String name);
+  JSWindowActorParent? getExistingActor(UTF8String name);
+
+  /**
+   * Renders a region of the frame into an image bitmap.
+   *
+   * @param rect Specify the area of the document to render, in CSS pixels,
+   * relative to the page. If null, the currently visible viewport is rendered.
+   * @param scale The scale to render the window at. Use devicePixelRatio
+   * to have comparable rendering to the OS.
+   * @param backgroundColor The background color to use.
+   * @param resetScrollPosition If true, temporarily resets the scroll position
+   * of the root scroll frame to 0, such that position:fixed elements are drawn
+   * at their initial position. This parameter only takes effect when passing a
+   * non-null rect.
+   *
+   * This API can only be used in the parent process, as content processes
+   * cannot access the rendering of out of process iframes. This API works
+   * with remote and local frames.
+   */
+  [NewObject]
+  Promise<ImageBitmap> drawSnapshot(DOMRect? rect,
+                                    double scale,
+                                    UTF8String backgroundColor,
+                                    optional boolean resetScrollPosition = false);
+
+  // True if any of the windows in the subtree rooted at this window
+  // has active peer connections.  If this is called for a non-top-level
+  // context, it always returns false.
+  boolean hasActivePeerConnections();
+};
+
+[Exposed=Window, ChromeOnly]
+interface WindowGlobalChild {
+  readonly attribute boolean isClosed;
+  readonly attribute boolean isInProcess;
+  readonly attribute BrowsingContext browsingContext;
+  readonly attribute WindowContext windowContext;
+
+  readonly attribute boolean isCurrentGlobal;
+
+  readonly attribute unsigned long long innerWindowId;
+  readonly attribute unsigned long long outerWindowId;
+  readonly attribute unsigned long long contentParentId;
+
+  // A WindowGlobalChild is the root in its process if it has no parent, or its
+  // embedder is in a different process.
+  readonly attribute boolean isProcessRoot;
+
+  // Is this WindowGlobalChild same-origin with `window.top`?
+  readonly attribute boolean sameOriginWithTop;
+
+  readonly attribute WindowGlobalParent? parentActor; // in-process only
+
+  static WindowGlobalChild? getByInnerWindowId(unsigned long long innerWIndowId);
+
+  /**
+   * Get or create the JSWindowActor with the given name.
+   *
+   * See WindowActorOptions from JSWindowActor.webidl for details on how to
+   * customize actor creation.
+   */
+  [Throws]
+  JSWindowActorChild getActor(UTF8String name);
+  JSWindowActorChild? getExistingActor(UTF8String name);
+};