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diff --git a/dom/webidl/MozFrameLoaderOwner.webidl b/dom/webidl/MozFrameLoaderOwner.webidl
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+++ b/dom/webidl/MozFrameLoaderOwner.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/.
+ */
+
+dictionary RemotenessOptions {
+  required UTF8String? remoteType;
+
+  // Used to resume a given channel load within the target process. If present,
+  // it will be used rather than the `src` & `srcdoc` attributes on the
+  // frameloader to control the load behaviour.
+  unsigned long long pendingSwitchID;
+
+  // True if we have an existing channel that we will resume in the
+  // target process, either via pendingSwitchID or using messageManager.
+  boolean switchingInProgressLoad = false;
+};
+
+/**
+ * A mixin included by elements that are 'browsing context containers'
+ * in HTML5 terms (that is, elements such as iframe that creates a new
+ * browsing context):
+ *
+ * https://html.spec.whatwg.org/#browsing-context-container
+ *
+ * Objects including this mixin must implement nsFrameLoaderOwner in
+ * native C++ code.
+ */
+interface mixin MozFrameLoaderOwner {
+  [ChromeOnly]
+  readonly attribute FrameLoader? frameLoader;
+
+  [ChromeOnly]
+  readonly attribute BrowsingContext? browsingContext;
+
+  [ChromeOnly, Throws]
+  undefined swapFrameLoaders(XULFrameElement aOtherLoaderOwner);
+
+  [ChromeOnly, Throws]
+  undefined swapFrameLoaders(HTMLIFrameElement aOtherLoaderOwner);
+
+  [ChromeOnly, Throws]
+  undefined changeRemoteness(RemotenessOptions aOptions);
+};