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diff --git a/dom/indexedDB/IndexedDBCipherKeyManager.h b/dom/indexedDB/IndexedDBCipherKeyManager.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_INDEXEDDBCIPHERKEYMANAGER_H_
+#define DOM_INDEXEDDB_INDEXEDDBCIPHERKEYMANAGER_H_
+
+#include "mozilla/DataMutex.h"
+#include "mozilla/dom/quota/IPCStreamCipherStrategy.h"
+#include "nsTHashMap.h"
+
+namespace mozilla::dom::indexedDB {
+
+using IndexedDBCipherStrategy = quota::IPCStreamCipherStrategy;
+using CipherKey = IndexedDBCipherStrategy::KeyType;
+
+class IndexedDBCipherKeyManager {
+  // This helper class is used by IndexedDB operations to store/retrieve cipher
+  // keys in private browsing mode. All data in IndexedDB must be encrypted
+  // using a cipher key and unique IV (Initialization Vector). While there's a
+  // separate cipher key for every blob file; the SQLite database gets encrypted
+  // using the commmon database key. All keys pertaining to a single IndexedDB
+  // database get stored together in a hashmap. So the hashmap can be used to
+  // to look up the common database key and blob keys using "default" and blob
+  // file ids respectively.
+
+ public:
+  IndexedDBCipherKeyManager() : mCipherKeys("IndexedDBCipherKeyManager"){};
+
+  Maybe<CipherKey> Get(const nsACString& aKeyId = "default"_ns);
+
+  CipherKey Ensure(const nsACString& aKeyId = "default"_ns);
+
+ private:
+  // XXX Maybe we can avoid a mutex here by moving all accesses to the
+  // background thread.
+  DataMutex<nsTHashMap<nsCStringHashKey, CipherKey>> mCipherKeys;
+};
+
+}  // namespace mozilla::dom::indexedDB
+
+#endif  // DOM_INDEXEDDB_INDEXEDDBCIPHERKEYMANAGER_H_