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diff --git a/dom/ipc/ProcessIsolation.h b/dom/ipc/ProcessIsolation.h
new file mode 100644
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+++ b/dom/ipc/ProcessIsolation.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_ProcessIsolation_h
+#define mozilla_dom_ProcessIsolation_h
+
+#include <stdint.h>
+
+#include "mozilla/Logging.h"
+#include "mozilla/dom/RemoteType.h"
+#include "mozilla/dom/SessionHistoryEntry.h"
+#include "nsString.h"
+#include "nsIPrincipal.h"
+#include "nsIURI.h"
+
+namespace mozilla::dom {
+
+class CanonicalBrowsingContext;
+class WindowGlobalParent;
+
+extern mozilla::LazyLogModule gProcessIsolationLog;
+
+constexpr nsLiteralCString kHighValueCOOPPermission = "highValueCOOP"_ns;
+constexpr nsLiteralCString kHighValueHasSavedLoginPermission =
+    "highValueHasSavedLogin"_ns;
+constexpr nsLiteralCString kHighValueIsLoggedInPermission =
+    "highValueIsLoggedIn"_ns;
+
+// NavigationIsolationOptions is passed through the methods to store the state
+// of the possible process and/or browsing context change.
+struct NavigationIsolationOptions {
+  nsCString mRemoteType;
+  bool mReplaceBrowsingContext = false;
+  uint64_t mSpecificGroupId = 0;
+  bool mTryUseBFCache = false;
+  RefPtr<SessionHistoryEntry> mActiveSessionHistoryEntry;
+};
+
+/**
+ * Given a specific channel, determines which process the navigation should
+ * complete in, and whether or not to perform a BrowsingContext-replace load
+ * or enter the BFCache.
+ *
+ * This method will always return a `NavigationIsolationOptions` even if the
+ * current remote type is compatible. Compatibility with the current process
+ * should be checked at the call-site. An error should only be returned in
+ * exceptional circumstances, and should lead to the load being cancelled.
+ *
+ * This method is only intended for use with document navigations.
+ */
+Result<NavigationIsolationOptions, nsresult> IsolationOptionsForNavigation(
+    CanonicalBrowsingContext* aTopBC, WindowGlobalParent* aParentWindow,
+    nsIURI* aChannelCreationURI, nsIChannel* aChannel,
+    const nsACString& aCurrentRemoteType, bool aHasCOOPMismatch,
+    bool aForNewTab, uint32_t aLoadStateLoadType,
+    const Maybe<uint64_t>& aChannelId,
+    const Maybe<nsCString>& aRemoteTypeOverride);
+
+/**
+ * Adds a `highValue` permission to the permissions database, and make loads of
+ * that origin isolated.
+ *
+ * The 'aPermissionType' parameter indicates why the site is treated as a high
+ * value site. The possible values are:
+ *
+ * kHighValueCOOPPermission
+ *     Called when a document request responds with a
+ * `Cross-Origin-Opener-Policy` header.
+ *
+ * kHighValueHasSavedLoginPermission
+ *     Called for sites that have an associated login saved in the password
+ * manager.
+ *
+ * kHighValueIsLoggedInPermission
+ *     Called when we detect a form with a password is submitted.
+ */
+void AddHighValuePermission(nsIPrincipal* aResultPrincipal,
+                            const nsACString& aPermissionType);
+
+void AddHighValuePermission(const nsACString& aOrigin,
+                            const nsACString& aPermissionType);
+
+/**
+ * Returns true when fission is enabled and the
+ * `fission.webContentIsolationStrategy` pref is set to `IsolateHighValue`.
+ */
+bool IsIsolateHighValueSiteEnabled();
+
+}  // namespace mozilla::dom
+
+#endif