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diff --git a/dom/ipc/RemoteBrowser.h b/dom/ipc/RemoteBrowser.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 mozilla_dom_ipc_RemoteBrowser_h
+#define mozilla_dom_ipc_RemoteBrowser_h
+
+#include "mozilla/dom/ipc/IdType.h"
+#include "mozilla/layers/LayersTypes.h"
+#include "nsISupports.h"
+#include "nsRect.h"
+#include "Units.h"
+
+class nsDocShellLoadState;
+class nsFrameLoader;
+class nsILoadContext;
+class nsIContent;
+
+namespace mozilla::dom {
+
+class BrowserHost;
+class BrowserBridgeHost;
+class BrowsingContext;
+class EffectsInfo;
+class OwnerShowInfo;
+
+/**
+ * An interface to control a browser hosted in another process.
+ *
+ * This is used by nsFrameLoader to abstract between hosting a top-level remote
+ * browser in the chrome process and hosting an OOP-iframe in a content process.
+ *
+ * There are two concrete implementations that are used depending on whether
+ * the nsFrameLoader is in the chrome or content process. A chrome process
+ * nsFrameLoader will use BrowserHost, and a content process nsFrameLoader will
+ * use BrowserBridgeHost.
+ */
+class RemoteBrowser : public nsISupports {
+ public:
+  using LayersId = mozilla::layers::LayersId;
+
+  static RemoteBrowser* GetFrom(nsFrameLoader* aFrameLoader);
+  static RemoteBrowser* GetFrom(nsIContent* aContent);
+
+  // Try to cast this RemoteBrowser to a BrowserHost, may return null
+  virtual BrowserHost* AsBrowserHost() = 0;
+  // Try to cast this RemoteBrowser to a BrowserBridgeHost, may return null
+  virtual BrowserBridgeHost* AsBrowserBridgeHost() = 0;
+
+  virtual TabId GetTabId() const = 0;
+  virtual LayersId GetLayersId() const = 0;
+  virtual BrowsingContext* GetBrowsingContext() const = 0;
+  virtual nsILoadContext* GetLoadContext() const = 0;
+  virtual bool CanRecv() const = 0;
+
+  virtual void LoadURL(nsDocShellLoadState* aLoadState) = 0;
+  virtual void ResumeLoad(uint64_t aPendingSwitchId) = 0;
+  virtual void DestroyStart() = 0;
+  virtual void DestroyComplete() = 0;
+
+  virtual bool Show(const OwnerShowInfo&) = 0;
+  virtual void UpdateDimensions(const nsIntRect& aRect,
+                                const ScreenIntSize& aSize) = 0;
+
+  virtual void UpdateEffects(EffectsInfo aInfo) = 0;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_ipc_RemoteBrowser_h