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diff --git a/dom/ipc/BrowserHost.h b/dom/ipc/BrowserHost.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_BrowserHost_h
+#define mozilla_dom_BrowserHost_h
+
+#include "nsIRemoteTab.h"
+#include "mozilla/dom/RemoteBrowser.h"
+#include "mozilla/dom/BrowserParent.h"
+
+class nsPIDOMWindowOuter;
+
+namespace mozilla {
+
+namespace a11y {
+class DocAccessibleParent;
+}  // namespace a11y
+
+namespace dom {
+
+class Element;
+
+/**
+ * BrowserHost manages a remote browser from the chrome process.
+ *
+ * It is used via the RemoteBrowser interface in nsFrameLoader and supports
+ * operations over the tree of BrowserParent/BrowserBridgeParent's.
+ *
+ * See `dom/docs/Fission-IPC-Diagram.svg` for an overview of the DOM IPC
+ * actors.
+ */
+class BrowserHost : public RemoteBrowser,
+                    public nsIRemoteTab,
+                    public nsSupportsWeakReference {
+ public:
+  typedef mozilla::layers::LayersId LayersId;
+
+  explicit BrowserHost(BrowserParent* aParent);
+
+  static BrowserHost* GetFrom(nsIRemoteTab* aRemoteTab);
+
+  // NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  // nsIRemoteTab
+  NS_DECL_NSIREMOTETAB
+
+  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(BrowserHost, RemoteBrowser)
+
+  // Get the IPDL actor for the root BrowserParent. This method should be
+  // avoided and consumers migrated to use this class.
+  BrowserParent* GetActor() { return mRoot; }
+  ContentParent* GetContentParent() const {
+    return mRoot ? mRoot->Manager() : nullptr;
+  }
+
+  BrowserHost* AsBrowserHost() override { return this; }
+  BrowserBridgeHost* AsBrowserBridgeHost() override { return nullptr; }
+
+  TabId GetTabId() const override;
+  LayersId GetLayersId() const override;
+  BrowsingContext* GetBrowsingContext() const override;
+  nsILoadContext* GetLoadContext() const override;
+  bool CanRecv() const override;
+
+  Element* GetOwnerElement() const { return mRoot->GetOwnerElement(); }
+  already_AddRefed<nsPIDOMWindowOuter> GetParentWindowOuter() const {
+    return mRoot->GetParentWindowOuter();
+  }
+  a11y::DocAccessibleParent* GetTopLevelDocAccessible() const;
+
+  // Visit each BrowserParent in the tree formed by PBrowser and
+  // PBrowserBridge that is anchored by `mRoot`.
+  template <typename Callback>
+  void VisitAll(Callback aCallback) {
+    if (!mRoot) {
+      return;
+    }
+    mRoot->VisitAll(aCallback);
+  }
+
+  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 ~BrowserHost() = default;
+
+  // The TabID for the root BrowserParent, we cache this so that we can access
+  // it after the remote browser has been destroyed
+  TabId mId;
+  // The root BrowserParent of this remote browser
+  RefPtr<BrowserParent> mRoot;
+  EffectsInfo mEffectsInfo;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_BrowserHost_h