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diff --git a/dom/base/nsFrameLoaderOwner.h b/dom/base/nsFrameLoaderOwner.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 nsFrameLoaderOwner_h_
+#define nsFrameLoaderOwner_h_
+
+#include <functional>
+#include "nsFrameLoader.h"
+#include "nsISupports.h"
+
+namespace mozilla {
+class ErrorResult;
+namespace dom {
+class BrowsingContext;
+class BrowsingContextGroup;
+class BrowserBridgeChild;
+class ContentParent;
+class Element;
+struct RemotenessOptions;
+struct NavigationIsolationOptions;
+}  // namespace dom
+}  // namespace mozilla
+
+// IID for the FrameLoaderOwner interface
+#define NS_FRAMELOADEROWNER_IID                      \
+  {                                                  \
+    0x1b4fd25c, 0x2e57, 0x11e9, {                    \
+      0x9e, 0x5a, 0x5b, 0x86, 0xe9, 0x89, 0xa5, 0xc0 \
+    }                                                \
+  }
+
+// Mixin that handles ownership of nsFrameLoader for Frame elements
+// (XULFrameElement, HTMLI/FrameElement, etc...). Manages information when doing
+// FrameLoader swaps.
+//
+// This class is considered an XPCOM mixin. This means that while we inherit
+// from ISupports in order to be QI'able, we expect the classes that inherit
+// nsFrameLoaderOwner to actually implement ISupports for us.
+class nsFrameLoaderOwner : public nsISupports {
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_FRAMELOADEROWNER_IID)
+
+  nsFrameLoaderOwner() = default;
+  already_AddRefed<nsFrameLoader> GetFrameLoader();
+  void SetFrameLoader(nsFrameLoader* aNewFrameLoader);
+
+  mozilla::dom::BrowsingContext* GetBrowsingContext();
+  mozilla::dom::BrowsingContext* GetExtantBrowsingContext();
+
+  // Destroy (if it exists) and recreate our frameloader, based on new
+  // remoteness requirements.
+  //
+  // This method is called by frontend code when it wants to perform a
+  // remoteness update, and allows for behaviour such as preserving
+  // BrowsingContexts across process switches during navigation.
+  //
+  // See the WebIDL definition for more details.
+  void ChangeRemoteness(const mozilla::dom::RemotenessOptions& aOptions,
+                        mozilla::ErrorResult& rv);
+
+  // Like `ChangeRemoteness` but switches to an already-created
+  // `BrowserBridgeChild`. This method is used when performing remote subframe
+  // process switches.
+  void ChangeRemotenessWithBridge(mozilla::dom::BrowserBridgeChild* aBridge,
+                                  mozilla::ErrorResult& rv);
+
+  // Like `ChangeRemoteness`, but switches into an already-created
+  // `ContentParent`. This method is used when performing toplevel process
+  // switches. If `aContentParent` is nullptr, switches into the parent process.
+  //
+  // If `aReplaceBrowsingContext` is set, BrowsingContext preservation will be
+  // disabled for this process switch.
+  void ChangeRemotenessToProcess(
+      mozilla::dom::ContentParent* aContentParent,
+      const mozilla::dom::NavigationIsolationOptions& aOptions,
+      mozilla::dom::BrowsingContextGroup* aGroup, mozilla::ErrorResult& rv);
+
+  void SubframeCrashed();
+
+  void RestoreFrameLoaderFromBFCache(nsFrameLoader* aNewFrameLoader);
+
+  void UpdateFocusAndMouseEnterStateAfterFrameLoaderChange();
+
+  void AttachFrameLoader(nsFrameLoader* aFrameLoader);
+  void DetachFrameLoader(nsFrameLoader* aFrameLoader);
+  void FrameLoaderDestroying(nsFrameLoader* aFrameLoader);
+
+ private:
+  bool UseRemoteSubframes();
+
+  // The enum class for determine how to handle previous BrowsingContext during
+  // the change remoteness. It could be followings
+  // 1. DONT_PRESERVE
+  //    Create a whole new BrowsingContext.
+  // 2. PRESERVE
+  //    Preserve the previous BrowsingContext.
+  enum class ChangeRemotenessContextType {
+    DONT_PRESERVE = 0,
+    PRESERVE = 1,
+  };
+  ChangeRemotenessContextType ShouldPreserveBrowsingContext(
+      bool aIsRemote, bool aReplaceBrowsingContext);
+
+  void ChangeRemotenessCommon(
+      const ChangeRemotenessContextType& aContextType,
+      const mozilla::dom::NavigationIsolationOptions& aOptions,
+      bool aSwitchingInProgressLoad, bool aIsRemote,
+      mozilla::dom::BrowsingContextGroup* aGroup,
+      std::function<void()>& aFrameLoaderInit, mozilla::ErrorResult& aRv);
+
+  void ChangeFrameLoaderCommon(mozilla::dom::Element* aOwner,
+                               bool aRetainPaint);
+
+  void UpdateFocusAndMouseEnterStateAfterFrameLoaderChange(
+      mozilla::dom::Element* aOwner);
+
+ protected:
+  virtual ~nsFrameLoaderOwner() = default;
+  RefPtr<nsFrameLoader> mFrameLoader;
+
+  // The list contains all the nsFrameLoaders created for this owner or moved
+  // from another nsFrameLoaderOwner which haven't been destroyed yet.
+  // In particular it contains all the nsFrameLoaders which are in bfcache.
+  mozilla::LinkedList<nsFrameLoader> mFrameLoaderList;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsFrameLoaderOwner, NS_FRAMELOADEROWNER_IID)
+
+#endif  // nsFrameLoaderOwner_h_