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diff --git a/dom/indexedDB/DatabaseFileManager.h b/dom/indexedDB/DatabaseFileManager.h
new file mode 100644
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+++ b/dom/indexedDB/DatabaseFileManager.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 DOM_INDEXEDDB_DATABASEFILEMANAGER_H_
+#define DOM_INDEXEDDB_DATABASEFILEMANAGER_H_
+
+#include "FileInfoManager.h"
+#include "IndexedDBCipherKeyManager.h"
+#include "mozilla/dom/FlippedOnce.h"
+#include "mozilla/dom/quota/CommonMetadata.h"
+#include "mozilla/dom/quota/PersistenceType.h"
+#include "mozilla/dom/quota/UsageInfo.h"
+#include "mozilla/InitializedOnce.h"
+
+class nsIFile;
+class mozIStorageConnection;
+
+namespace mozilla::dom::indexedDB {
+
+// Implemented in ActorsParent.cpp.
+class DatabaseFileManager final
+    : public FileInfoManager<DatabaseFileManager>,
+      public AtomicSafeRefCounted<DatabaseFileManager> {
+  using PersistenceType = mozilla::dom::quota::PersistenceType;
+  using FileInfoManager<DatabaseFileManager>::MutexType;
+
+  const PersistenceType mPersistenceType;
+  const quota::OriginMetadata mOriginMetadata;
+  const nsString mDatabaseName;
+  const nsCString mDatabaseID;
+
+  RefPtr<IndexedDBCipherKeyManager> mCipherKeyManager;
+
+  LazyInitializedOnce<const nsString> mDirectoryPath;
+  LazyInitializedOnce<const nsString> mJournalDirectoryPath;
+
+  const bool mEnforcingQuota;
+  const bool mIsInPrivateBrowsingMode;
+
+  FlippedOnce<false> mInitialized;
+
+  // Lock protecting DatabaseFileManager.mFileInfos.
+  // It's s also used to atomically update DatabaseFileInfo.mRefCnt and
+  // DatabaseFileInfo.mDBRefCnt
+  static MutexType sMutex;
+
+ public:
+  [[nodiscard]] static nsCOMPtr<nsIFile> GetFileForId(nsIFile* aDirectory,
+                                                      int64_t aId);
+
+  [[nodiscard]] static nsCOMPtr<nsIFile> GetCheckedFileForId(
+      nsIFile* aDirectory, int64_t aId);
+
+  static nsresult InitDirectory(nsIFile& aDirectory, nsIFile& aDatabaseFile,
+                                const nsACString& aOrigin,
+                                uint32_t aTelemetryId);
+
+  template <typename KnownDirEntryOp, typename UnknownDirEntryOp>
+  static Result<Ok, nsresult> TraverseFiles(
+      nsIFile& aDirectory, KnownDirEntryOp&& aKnownDirEntryOp,
+      UnknownDirEntryOp&& aUnknownDirEntryOp);
+
+  static Result<quota::FileUsageType, nsresult> GetUsage(nsIFile* aDirectory);
+
+  DatabaseFileManager(PersistenceType aPersistenceType,
+                      const quota::OriginMetadata& aOriginMetadata,
+                      const nsAString& aDatabaseName,
+                      const nsCString& aDatabaseID, bool aEnforcingQuota,
+                      bool aIsInPrivateBrowsingMode);
+
+  PersistenceType Type() const { return mPersistenceType; }
+
+  const quota::OriginMetadata& OriginMetadata() const {
+    return mOriginMetadata;
+  }
+
+  const nsACString& Origin() const { return mOriginMetadata.mOrigin; }
+
+  const nsAString& DatabaseName() const { return mDatabaseName; }
+
+  const nsCString& DatabaseID() const { return mDatabaseID; }
+
+  IndexedDBCipherKeyManager& MutableCipherKeyManagerRef() const {
+    MOZ_ASSERT(mIsInPrivateBrowsingMode);
+    MOZ_ASSERT(mCipherKeyManager);
+
+    return *mCipherKeyManager;
+  }
+
+  auto IsInPrivateBrowsingMode() const { return mIsInPrivateBrowsingMode; }
+
+  bool EnforcingQuota() const { return mEnforcingQuota; }
+
+  bool Initialized() const { return mInitialized; }
+
+  nsresult Init(nsIFile* aDirectory, mozIStorageConnection& aConnection);
+
+  [[nodiscard]] nsCOMPtr<nsIFile> GetDirectory();
+
+  [[nodiscard]] nsCOMPtr<nsIFile> GetCheckedDirectory();
+
+  [[nodiscard]] nsCOMPtr<nsIFile> GetJournalDirectory();
+
+  [[nodiscard]] nsCOMPtr<nsIFile> EnsureJournalDirectory();
+
+  [[nodiscard]] nsresult SyncDeleteFile(int64_t aId);
+
+  // XXX When getting rid of FileHelper, this method should be removed/made
+  // private.
+  [[nodiscard]] nsresult SyncDeleteFile(nsIFile& aFile,
+                                        nsIFile& aJournalFile) const;
+
+  [[nodiscard]] nsresult AsyncDeleteFile(int64_t aFileId);
+
+  nsresult Invalidate() override;
+
+  MOZ_DECLARE_REFCOUNTED_TYPENAME(DatabaseFileManager)
+
+  static StaticMutex& Mutex() { return sMutex; }
+
+  ~DatabaseFileManager() = default;
+};
+
+}  // namespace mozilla::dom::indexedDB
+
+#endif  // DOM_INDEXEDDB_DATABASEFILEMANAGER_H_