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diff --git a/dom/base/nsContentAreaDragDrop.h b/dom/base/nsContentAreaDragDrop.h
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+++ b/dom/base/nsContentAreaDragDrop.h
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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/. */
+
+#ifndef nsContentAreaDragDrop_h__
+#define nsContentAreaDragDrop_h__
+
+#include "nsCOMPtr.h"
+
+#include "nsITransferable.h"
+#include "nsIContentSecurityPolicy.h"
+
+class nsICookieJarSettings;
+class nsPIDOMWindowOuter;
+class nsITransferable;
+class nsIContent;
+class nsIFile;
+
+namespace mozilla::dom {
+class DataTransfer;
+class Selection;
+}  // namespace mozilla::dom
+
+//
+// class nsContentAreaDragDrop, used to generate the dragdata
+//
+class nsContentAreaDragDrop {
+ public:
+  /**
+   * Determine what data in the content area, if any, is being dragged.
+   *
+   * aWindow - the window containing the target node
+   * aTarget - the mousedown event target that started the drag
+   * aSelectionTargetNode - the node where the drag event should be fired
+   * aIsAltKeyPressed - true if the Alt key is pressed. In some cases, this
+   *                    will prevent the drag from occuring. For example,
+   *                    holding down Alt over a link should select the text,
+   *                    not drag the link.
+   * aDataTransfer - the dataTransfer for the drag event.
+   * aCanDrag - [out] set to true if the drag may proceed, false to stop the
+   *            drag entirely
+   * aSelection - [out] set to the selection being dragged, or null if no
+   *                    selection is being dragged.
+   * aDragNode - [out] the link, image or area being dragged, or null if the
+   *             drag occurred on another element.
+   * aCSP       - [out] set to the CSP of the Drag, or null if
+   *                    it's from browser chrome or OS
+   * aCookieJarSettings - [out] set to the cookieJarSetting of the Drag, or null
+   *                            if it's from browser chrome or OS
+   */
+  static nsresult GetDragData(nsPIDOMWindowOuter* aWindow, nsIContent* aTarget,
+                              nsIContent* aSelectionTargetNode,
+                              bool aIsAltKeyPressed,
+                              mozilla::dom::DataTransfer* aDataTransfer,
+                              bool* aCanDrag,
+                              mozilla::dom::Selection** aSelection,
+                              nsIContent** aDragNode,
+                              nsIContentSecurityPolicy** aCsp,
+                              nsICookieJarSettings** aCookieJarSettings);
+};
+
+// this is used to save images to disk lazily when the image data is asked for
+// during the drop instead of when it is added to the drag data transfer. This
+// ensures that the image data is only created when an image drop is allowed.
+class nsContentAreaDragDropDataProvider : public nsIFlavorDataProvider {
+  virtual ~nsContentAreaDragDropDataProvider() = default;
+
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIFLAVORDATAPROVIDER
+
+  nsresult SaveURIToFile(nsIURI* inSourceURI,
+                         nsIPrincipal* inTriggeringPrincipal,
+                         nsICookieJarSettings* inCookieJarSettings,
+                         nsIFile* inDestFile, nsContentPolicyType inPolicyType,
+                         bool isPrivate);
+};
+
+#endif /* nsContentAreaDragDrop_h__ */