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diff --git a/dom/ipc/BrowserBridgeHost.h b/dom/ipc/BrowserBridgeHost.h
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+++ b/dom/ipc/BrowserBridgeHost.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_BrowserBridgeHost_h
+#define mozilla_dom_BrowserBridgeHost_h
+
+#include "mozilla/dom/RemoteBrowser.h"
+#include "mozilla/dom/BrowserBridgeChild.h"
+
+namespace mozilla::dom {
+
+/**
+ * BrowserBridgeHost manages a remote browser from a content process.
+ *
+ * It is used via the RemoteBrowser interface in nsFrameLoader and proxies
+ * work to the chrome process via PBrowserBridge.
+ *
+ * See `dom/docs/Fission-IPC-Diagram.svg` for an overview of the DOM IPC
+ * actors.
+ */
+class BrowserBridgeHost : public RemoteBrowser {
+ public:
+  typedef mozilla::layers::LayersId LayersId;
+
+  explicit BrowserBridgeHost(BrowserBridgeChild* aChild);
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS(BrowserBridgeHost)
+
+  // Get the IPDL actor for the BrowserBridgeChild.
+  BrowserBridgeChild* GetActor() { return mBridge; }
+
+  BrowserHost* AsBrowserHost() override { return nullptr; }
+  BrowserBridgeHost* AsBrowserBridgeHost() override { return this; }
+
+  TabId GetTabId() const override;
+  LayersId GetLayersId() const override;
+  BrowsingContext* GetBrowsingContext() const override;
+  nsILoadContext* GetLoadContext() const override;
+  bool CanRecv() const override;
+
+  void LoadURL(nsDocShellLoadState* aLoadState) override;
+  void ResumeLoad(uint64_t aPendingSwitchId) override;
+  void DestroyStart() override;
+  void DestroyComplete() override;
+
+  bool Show(const OwnerShowInfo&) override;
+  void UpdateDimensions(const nsIntRect& aRect,
+                        const ScreenIntSize& aSize) override;
+
+  void UpdateEffects(EffectsInfo aInfo) override;
+
+ private:
+  virtual ~BrowserBridgeHost() = default;
+
+  already_AddRefed<nsIWidget> GetWidget() const;
+
+  // The IPDL actor for proxying browser operations
+  RefPtr<BrowserBridgeChild> mBridge;
+  EffectsInfo mEffectsInfo;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_BrowserBridgeHost_h