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diff --git a/dom/chrome-webidl/FrameLoader.webidl b/dom/chrome-webidl/FrameLoader.webidl
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+++ b/dom/chrome-webidl/FrameLoader.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 LoadContext;
+interface RemoteTab;
+interface URI;
+interface nsIDocShell;
+interface nsIPrintSettings;
+interface nsIWebBrowserPersistDocumentReceiver;
+interface nsIWebProgressListener;
+
+[ChromeOnly,
+ Exposed=Window]
+interface FrameLoader {
+  /**
+   * Get the docshell from the frame loader.
+   */
+  [GetterThrows]
+  readonly attribute nsIDocShell? docShell;
+
+  /**
+   * Get this frame loader's RemoteTab, if it has a remote frame.  Otherwise,
+   * returns null.
+   */
+  readonly attribute RemoteTab? remoteTab;
+
+  /**
+   * Get an nsILoadContext for the top-level docshell. For remote
+   * frames, a shim is returned that contains private browsing and app
+   * information.
+   */
+  readonly attribute LoadContext loadContext;
+
+  /**
+   * Get the root BrowsingContext within the frame.
+   * This may be null immediately after creating a remote frame.
+   */
+  readonly attribute BrowsingContext? browsingContext;
+
+  /**
+   * Find out whether the loader's frame is at too great a depth in
+   * the frame tree.  This can be used to decide what operations may
+   * or may not be allowed on the loader's docshell.
+   */
+  [Pure]
+  readonly attribute boolean depthTooGreat;
+
+  /**
+   * Find out whether the loader's frame is a remote frame.
+   */
+  readonly attribute boolean isRemoteFrame;
+
+  // Note, when frameloaders are swapped, also messageManagers are swapped.
+  readonly attribute MessageSender? messageManager;
+
+  /**
+   * Force a remote browser to recompute its dimension and screen position.
+   */
+  [Throws]
+  undefined requestUpdatePosition();
+
+  /**
+   * Force a TabStateFlush from native sessionStoreListeners.
+   * Returns a promise that resolves when all session store data has been
+   * flushed.
+   */
+  [NewObject]
+  Promise<undefined> requestTabStateFlush();
+
+  /**
+   * Force Epoch update in native sessionStoreListeners.
+   */
+  undefined requestEpochUpdate(unsigned long aEpoch);
+
+  /**
+   * Request a session history update in native sessionStoreListeners.
+   */
+  undefined requestSHistoryUpdate();
+
+  /**
+   * Creates a print preview document in this frame, or updates the existing
+   * print preview document with new print settings.
+   *
+   * @param aPrintSettings The print settings to use to layout the print
+   *   preview document.
+   * @param aSourceBrowsingContext Optionally, the browsing context that
+   *   contains the document from which the print preview is to be generated,
+   *   which must be in the same process as the browsing context of the frame
+   *   loader itself.
+   *
+   *   This should only be passed on the first call.  It should not be passed
+   *   for any subsequent calls that are made to update the existing print
+   *   preview document with a new print settings object.
+   * @return A Promise that resolves with a PrintPreviewSuccessInfo on success.
+   */
+  [NewObject]
+  Promise<unsigned long> printPreview(nsIPrintSettings aPrintSettings,
+                                      BrowsingContext? aSourceBrowsingContext);
+
+  /**
+   * Inform the print preview document that we're done with it.
+   */
+  undefined exitPrintPreview();
+
+  /**
+   * The element which owns this frame loader.
+   *
+   * For example, if this is a frame loader for an <iframe>, this attribute
+   * returns the iframe element.
+   */
+  [Pure]
+  readonly attribute Element? ownerElement;
+
+
+  /**
+   * Cached childID of the ContentParent owning the RemoteTab in this frame
+   * loader. This can be used to obtain the childID after the RemoteTab died.
+   */
+  [Pure]
+  readonly attribute unsigned long long childID;
+
+  /**
+   * Find out whether the owner content really is a mozbrowser. <xul:browser>
+   * is not considered to be a mozbrowser frame.
+   */
+  [Pure]
+  readonly attribute boolean ownerIsMozBrowserFrame;
+
+  /**
+   * The last known width of the frame. Reading this property will not trigger
+   * a reflow, and therefore may not reflect the current state of things. It
+   * should only be used in asynchronous APIs where values are not guaranteed
+   * to be up-to-date when received.
+   */
+  [Pure]
+  readonly attribute unsigned long lazyWidth;
+
+  /**
+   * The last known height of the frame. Reading this property will not trigger
+   * a reflow, and therefore may not reflect the current state of things. It
+   * should only be used in asynchronous APIs where values are not guaranteed
+   * to be up-to-date when received.
+   */
+  [Pure]
+  readonly attribute unsigned long lazyHeight;
+
+  /**
+   * Is `true` if the frameloader is dead (destroy has been called on it)
+   */
+  [Pure]
+  readonly attribute boolean isDead;
+};
+
+/**
+ * Interface for objects which represent a document that can be
+ * serialized with nsIWebBrowserPersist.  This interface is
+ * asynchronous because the actual document can be in another process
+ * (e.g., if this object is a FrameLoader for an out-of-process
+ * frame).
+ *
+ * @see nsIWebBrowserPersistDocumentReceiver
+ * @see nsIWebBrowserPersistDocument
+ * @see nsIWebBrowserPersist
+ *
+ * @param aContext
+ *        The browsing context of the subframe we'd like to persist.
+ *        If set to nullptr, WebBrowserPersistable will attempt to persist
+ *        the top-level document. If the browsing context is for a subframe
+ *        that is not held beneath the WebBrowserPersistable, aRecv's onError
+ *        method will be called with NS_ERROR_NO_CONTENT.
+ * @param aRecv
+ *        The nsIWebBrowserPersistDocumentReceiver is a callback that
+ *        will be fired once the document is ready for persisting.
+ */
+interface mixin WebBrowserPersistable
+{
+  [Throws]
+  undefined startPersistence(BrowsingContext? aContext,
+                             nsIWebBrowserPersistDocumentReceiver aRecv);
+};
+
+enum PrintPreviewOrientation {
+    "landscape",
+    "portrait",
+    "unspecified"
+};
+
+/**
+ * Interface for the object that's used to resolve the Promise returned from
+ * FrameLoader.printPreview() if that method successfully creates the print
+ * preview document/successfully updates it with new settings.
+ */
+[GenerateConversionToJS]
+dictionary PrintPreviewSuccessInfo {
+  /**
+   * The total number of sheets of paper required to print, taking into account
+   * the provided nsIPrintSettings.  This takes into account page range
+   * selection, the pages-per-sheet, whether duplex printing is enabled, etc.
+   */
+  unsigned long sheetCount = 0;
+
+  /**
+   * The total number of virtual pages, not taking into account page range
+   * selection, the pages-per-sheet, whether duplex printing is enabled, etc.
+   */
+  unsigned long totalPageCount = 0;
+
+  /**
+   * Whether the preview is empty because of page range selection.
+   */
+  boolean isEmpty = false;
+
+  /**
+   * Whether the document or any subdocument has a selection that can be
+   * printed.
+   */
+  boolean hasSelection = false;
+
+  /**
+   * Whether the previewed document has a selection itself.
+   */
+  boolean hasSelfSelection = false;
+
+  /**
+   * Specified orientation of the document, or "unspecified".
+   */
+  PrintPreviewOrientation orientation = "unspecified";
+};
+
+FrameLoader includes WebBrowserPersistable;