diff --git a/dom/indexedDB/IDBIndex.cpp b/dom/indexedDB/IDBIndex.cpp
index f12c3b689c83..970e2300205b 100644
--- a/dom/indexedDB/IDBIndex.cpp
+++ b/dom/indexedDB/IDBIndex.cpp
@@ -7,6 +7,7 @@
 #include "IDBIndex.h"
 
 #include "IDBCursorType.h"
+#include "IDBDatabase.h"
 #include "IDBEvents.h"
 #include "IDBKeyRange.h"
 #include "IDBObjectStore.h"
diff --git a/dom/indexedDB/IndexedDatabaseManager.cpp b/dom/indexedDB/IndexedDatabaseManager.cpp
index a826e7318fe2..68a5c5d64ad5 100644
--- a/dom/indexedDB/IndexedDatabaseManager.cpp
+++ b/dom/indexedDB/IndexedDatabaseManager.cpp
@@ -26,6 +26,7 @@
 #include "nsGlobalWindow.h"
 #include "mozilla/Logging.h"
 
+#include "ActorsChild.h"
 #include "FileManager.h"
 #include "IDBEvents.h"
 #include "IDBFactory.h"
diff --git a/dom/indexedDB/ProfilerHelpers.cpp b/dom/indexedDB/ProfilerHelpers.cpp
new file mode 100644
index 000000000000..ebfe06f439c8
--- /dev/null
+++ b/dom/indexedDB/ProfilerHelpers.cpp
@@ -0,0 +1,267 @@
+/* -*- 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/. */
+
+#include "ProfilerHelpers.h"
+
+#include "ActorsChild.h"
+#include "BackgroundChildImpl.h"
+#include "GeckoProfiler.h"
+#include "IDBDatabase.h"
+#include "IDBIndex.h"
+#include "IDBKeyRange.h"
+#include "IDBObjectStore.h"
+#include "IDBTransaction.h"
+#include "Key.h"
+
+namespace mozilla {
+namespace dom {
+namespace indexedDB {
+
+namespace {
+static const char kQuote = '\"';
+static const char kOpenBracket = '[';
+static const char kCloseBracket = ']';
+static const char kOpenParen = '(';
+static const char kCloseParen = ')';
+}  // namespace
+
+LoggingIdString::LoggingIdString() {
+  using mozilla::ipc::BackgroundChildImpl;
+
+  if (IndexedDatabaseManager::GetLoggingMode() !=
+      IndexedDatabaseManager::Logging_Disabled) {
+    const BackgroundChildImpl::ThreadLocal* threadLocal =
+        BackgroundChildImpl::GetThreadLocalForCurrentThread();
+    if (threadLocal) {
+      const auto& idbThreadLocal = threadLocal->mIndexedDBThreadLocal;
+      if (idbThreadLocal) {
+        Assign(idbThreadLocal->IdString());
+      }
+    }
+  }
+}
+
+LoggingIdString::LoggingIdString(const nsID& aID) {
+  static_assert(NSID_LENGTH > 1, "NSID_LENGTH is set incorrectly!");
+  static_assert(NSID_LENGTH <= kStorageSize,
+                "nsID string won't fit in our storage!");
+  // Capacity() excludes the null terminator; NSID_LENGTH includes it.
+  MOZ_ASSERT(Capacity() + 1 == NSID_LENGTH);
+
+  if (IndexedDatabaseManager::GetLoggingMode() !=
+      IndexedDatabaseManager::Logging_Disabled) {
+    // NSID_LENGTH counts the null terminator, SetLength() does not.
+    SetLength(NSID_LENGTH - 1);
+
+    aID.ToProvidedString(
+        *reinterpret_cast<char(*)[NSID_LENGTH]>(BeginWriting()));
+  }
+}
+
+LoggingString::LoggingString(IDBDatabase* aDatabase) : nsAutoCString(kQuote) {
+  MOZ_ASSERT(aDatabase);
+
+  AppendUTF16toUTF8(aDatabase->Name(), *this);
+  Append(kQuote);
+}
+
+LoggingString::LoggingString(const IDBTransaction& aTransaction)
+    : nsAutoCString(kOpenBracket) {
+  constexpr auto kCommaSpace = ", "_ns;
+
+  const nsTArray<nsString>& stores = aTransaction.ObjectStoreNamesInternal();
+
+  for (uint32_t count = stores.Length(), index = 0; index < count; index++) {
+    Append(kQuote);
+    AppendUTF16toUTF8(stores[index], *this);
+    Append(kQuote);
+
+    if (index != count - 1) {
+      Append(kCommaSpace);
+    }
+  }
+
+  Append(kCloseBracket);
+  Append(kCommaSpace);
+
+  switch (aTransaction.GetMode()) {
+    case IDBTransaction::Mode::ReadOnly:
+      AppendLiteral("\"readonly\"");
+      break;
+    case IDBTransaction::Mode::ReadWrite:
+      AppendLiteral("\"readwrite\"");
+      break;
+    case IDBTransaction::Mode::ReadWriteFlush:
+      AppendLiteral("\"readwriteflush\"");
+      break;
+    case IDBTransaction::Mode::Cleanup:
+      AppendLiteral("\"cleanup\"");
+      break;
+    case IDBTransaction::Mode::VersionChange:
+      AppendLiteral("\"versionchange\"");
+      break;
+    default:
+      MOZ_CRASH("Unknown mode!");
+  };
+}
+
+LoggingString::LoggingString(IDBObjectStore* aObjectStore)
+    : nsAutoCString(kQuote) {
+  MOZ_ASSERT(aObjectStore);
+
+  AppendUTF16toUTF8(aObjectStore->Name(), *this);
+  Append(kQuote);
+}
+
+LoggingString::LoggingString(IDBIndex* aIndex) : nsAutoCString(kQuote) {
+  MOZ_ASSERT(aIndex);
+
+  AppendUTF16toUTF8(aIndex->Name(), *this);
+  Append(kQuote);
+}
+
+LoggingString::LoggingString(IDBKeyRange* aKeyRange) {
+  if (aKeyRange) {
+    if (aKeyRange->IsOnly()) {
+      Assign(LoggingString(aKeyRange->Lower()));
+    } else {
+      if (aKeyRange->LowerOpen()) {
+        Assign(kOpenParen);
+      } else {
+        Assign(kOpenBracket);
+      }
+
+      Append(LoggingString(aKeyRange->Lower()));
+      AppendLiteral(", ");
+      Append(LoggingString(aKeyRange->Upper()));
+
+      if (aKeyRange->UpperOpen()) {
+        Append(kCloseParen);
+      } else {
+        Append(kCloseBracket);
+      }
+    }
+  } else {
+    AssignLiteral("<undefined>");
+  }
+}
+
+LoggingString::LoggingString(const Key& aKey) {
+  if (aKey.IsUnset()) {
+    AssignLiteral("<undefined>");
+  } else if (aKey.IsFloat()) {
+    AppendPrintf("%g", aKey.ToFloat());
+  } else if (aKey.IsDate()) {
+    AppendPrintf("<Date %g>", aKey.ToDateMsec());
+  } else if (aKey.IsString()) {
+    AppendPrintf("\"%s\"", NS_ConvertUTF16toUTF8(aKey.ToString()).get());
+  } else if (aKey.IsBinary()) {
+    AssignLiteral("[object ArrayBuffer]");
+  } else {
+    MOZ_ASSERT(aKey.IsArray());
+    AssignLiteral("[...]");
+  }
+}
+
+LoggingString::LoggingString(const IDBCursorDirection aDirection) {
+  switch (aDirection) {
+    case IDBCursorDirection::Next:
+      AssignLiteral("\"next\"");
+      break;
+    case IDBCursorDirection::Nextunique:
+      AssignLiteral("\"nextunique\"");
+      break;
+    case IDBCursorDirection::Prev:
+      AssignLiteral("\"prev\"");
+      break;
+    case IDBCursorDirection::Prevunique:
+      AssignLiteral("\"prevunique\"");
+      break;
+    default:
+      MOZ_CRASH("Unknown direction!");
+  };
+}
+
+LoggingString::LoggingString(const Optional<uint64_t>& aVersion) {
+  if (aVersion.WasPassed()) {
+    AppendInt(aVersion.Value());
+  } else {
+    AssignLiteral("<undefined>");
+  }
+}
+
+LoggingString::LoggingString(const Optional<uint32_t>& aLimit) {
+  if (aLimit.WasPassed()) {
+    AppendInt(aLimit.Value());
+  } else {
+    AssignLiteral("<undefined>");
+  }
+}
+
+LoggingString::LoggingString(IDBObjectStore* aObjectStore, const Key& aKey) {
+  MOZ_ASSERT(aObjectStore);
+
+  if (!aObjectStore->HasValidKeyPath()) {
+    Append(LoggingString(aKey));
+  }
+}
+
+LoggingString::LoggingString(Event* aEvent, const char16_t* aDefault)
+    : nsAutoCString(kQuote) {
+  MOZ_ASSERT(aDefault);
+
+  nsAutoString eventType;
+
+  if (aEvent) {
+    aEvent->GetType(eventType);
+  } else {
+    eventType = nsDependentString(aDefault);
+  }
+
+  AppendUTF16toUTF8(eventType, *this);
+  Append(kQuote);
+}
+
+void MOZ_FORMAT_PRINTF(2, 3)
+    LoggingHelper(bool aUseProfiler, const char* aFmt, ...) {
+  MOZ_ASSERT(IndexedDatabaseManager::GetLoggingMode() !=
+             IndexedDatabaseManager::Logging_Disabled);
+  MOZ_ASSERT(aFmt);
+
+  mozilla::LogModule* logModule = IndexedDatabaseManager::GetLoggingModule();
+  MOZ_ASSERT(logModule);
+
+  static const mozilla::LogLevel logLevel = LogLevel::Warning;
+
+  if (MOZ_LOG_TEST(logModule, logLevel) ||
+#ifdef MOZ_GECKO_PROFILER
+      (aUseProfiler && profiler_thread_is_being_profiled())
+#else
+      false
+#endif
+  ) {
+    nsAutoCString message;
+
+    {
+      va_list args;
+      va_start(args, aFmt);
+
+      message.AppendPrintf(aFmt, args);
+
+      va_end(args);
+    }
+
+    MOZ_LOG(logModule, logLevel, ("%s", message.get()));
+
+    if (aUseProfiler) {
+      PROFILER_ADD_MARKER(message.get(), DOM);
+    }
+  }
+}
+
+}  // namespace indexedDB
+}  // namespace dom
+}  // namespace mozilla
diff --git a/dom/indexedDB/ProfilerHelpers.h b/dom/indexedDB/ProfilerHelpers.h
index d8bdf3efae77..7b4640d1e649 100644
--- a/dom/indexedDB/ProfilerHelpers.h
+++ b/dom/indexedDB/ProfilerHelpers.h
@@ -10,277 +10,52 @@
 // This file is not exported and is only meant to be included in IndexedDB
 // source files.
 
-#include "BackgroundChildImpl.h"
-#include "GeckoProfiler.h"
-#include "IDBCursorType.h"
-#include "IDBDatabase.h"
-#include "IDBIndex.h"
-#include "IDBKeyRange.h"
-#include "IDBObjectStore.h"
-#include "IDBTransaction.h"
 #include "IndexedDatabaseManager.h"
-#include "Key.h"
-#include "mozilla/Assertions.h"
-#include "mozilla/Attributes.h"
 #include "mozilla/dom/BindingDeclarations.h"
-#include "mozilla/dom/Event.h"
-#include "nsDebug.h"
+#include "mozilla/dom/IDBCursorBinding.h"
 #include "nsID.h"
 #include "nsString.h"
-#include "mozilla/Logging.h"
-
-// Include this last to avoid path problems on Windows.
-#include "ActorsChild.h"
 
 namespace mozilla {
 namespace dom {
+
+class Event;
+class IDBDatabase;
+class IDBIndex;
+class IDBKeyRange;
+class IDBObjectStore;
+class IDBTransaction;
+
 namespace indexedDB {
 
+class Key;
+
 class MOZ_STACK_CLASS LoggingIdString final
     : public nsAutoCStringN<NSID_LENGTH> {
  public:
-  LoggingIdString() {
-    using mozilla::ipc::BackgroundChildImpl;
+  LoggingIdString();
 
-    if (IndexedDatabaseManager::GetLoggingMode() !=
-        IndexedDatabaseManager::Logging_Disabled) {
-      const BackgroundChildImpl::ThreadLocal* threadLocal =
-          BackgroundChildImpl::GetThreadLocalForCurrentThread();
-      if (threadLocal) {
-        const auto& idbThreadLocal = threadLocal->mIndexedDBThreadLocal;
-        if (idbThreadLocal) {
-          Assign(idbThreadLocal->IdString());
-        }
-      }
-    }
-  }
-
-  explicit LoggingIdString(const nsID& aID) {
-    static_assert(NSID_LENGTH > 1, "NSID_LENGTH is set incorrectly!");
-    static_assert(NSID_LENGTH <= kStorageSize,
-                  "nsID string won't fit in our storage!");
-    // Capacity() excludes the null terminator; NSID_LENGTH includes it.
-    MOZ_ASSERT(Capacity() + 1 == NSID_LENGTH);
-
-    if (IndexedDatabaseManager::GetLoggingMode() !=
-        IndexedDatabaseManager::Logging_Disabled) {
-      // NSID_LENGTH counts the null terminator, SetLength() does not.
-      SetLength(NSID_LENGTH - 1);
-
-      aID.ToProvidedString(
-          *reinterpret_cast<char(*)[NSID_LENGTH]>(BeginWriting()));
-    }
-  }
+  explicit LoggingIdString(const nsID& aID);
 };
 
 class MOZ_STACK_CLASS LoggingString final : public nsAutoCString {
-  static const char kQuote = '\"';
-  static const char kOpenBracket = '[';
-  static const char kCloseBracket = ']';
-  static const char kOpenParen = '(';
-  static const char kCloseParen = ')';
-
  public:
-  explicit LoggingString(IDBDatabase* aDatabase) : nsAutoCString(kQuote) {
-    MOZ_ASSERT(aDatabase);
+  explicit LoggingString(IDBDatabase* aDatabase);
+  explicit LoggingString(const IDBTransaction& aTransaction);
+  explicit LoggingString(IDBObjectStore* aObjectStore);
+  explicit LoggingString(IDBIndex* aIndex);
+  explicit LoggingString(IDBKeyRange* aKeyRange);
+  explicit LoggingString(const Key& aKey);
+  explicit LoggingString(const IDBCursorDirection aDirection);
+  explicit LoggingString(const Optional<uint64_t>& aVersion);
+  explicit LoggingString(const Optional<uint32_t>& aLimit);
 
-    AppendUTF16toUTF8(aDatabase->Name(), *this);
-    Append(kQuote);
-  }
-
-  explicit LoggingString(const IDBTransaction& aTransaction)
-      : nsAutoCString(kOpenBracket) {
-    constexpr auto kCommaSpace = ", "_ns;
-
-    const nsTArray<nsString>& stores = aTransaction.ObjectStoreNamesInternal();
-
-    for (uint32_t count = stores.Length(), index = 0; index < count; index++) {
-      Append(kQuote);
-      AppendUTF16toUTF8(stores[index], *this);
-      Append(kQuote);
-
-      if (index != count - 1) {
-        Append(kCommaSpace);
-      }
-    }
-
-    Append(kCloseBracket);
-    Append(kCommaSpace);
-
-    switch (aTransaction.GetMode()) {
-      case IDBTransaction::Mode::ReadOnly:
-        AppendLiteral("\"readonly\"");
-        break;
-      case IDBTransaction::Mode::ReadWrite:
-        AppendLiteral("\"readwrite\"");
-        break;
-      case IDBTransaction::Mode::ReadWriteFlush:
-        AppendLiteral("\"readwriteflush\"");
-        break;
-      case IDBTransaction::Mode::Cleanup:
-        AppendLiteral("\"cleanup\"");
-        break;
-      case IDBTransaction::Mode::VersionChange:
-        AppendLiteral("\"versionchange\"");
-        break;
-      default:
-        MOZ_CRASH("Unknown mode!");
-    };
-  }
-
-  explicit LoggingString(IDBObjectStore* aObjectStore) : nsAutoCString(kQuote) {
-    MOZ_ASSERT(aObjectStore);
-
-    AppendUTF16toUTF8(aObjectStore->Name(), *this);
-    Append(kQuote);
-  }
-
-  explicit LoggingString(IDBIndex* aIndex) : nsAutoCString(kQuote) {
-    MOZ_ASSERT(aIndex);
-
-    AppendUTF16toUTF8(aIndex->Name(), *this);
-    Append(kQuote);
-  }
-
-  explicit LoggingString(IDBKeyRange* aKeyRange) {
-    if (aKeyRange) {
-      if (aKeyRange->IsOnly()) {
-        Assign(LoggingString(aKeyRange->Lower()));
-      } else {
-        if (aKeyRange->LowerOpen()) {
-          Assign(kOpenParen);
-        } else {
-          Assign(kOpenBracket);
-        }
-
-        Append(LoggingString(aKeyRange->Lower()));
-        AppendLiteral(", ");
-        Append(LoggingString(aKeyRange->Upper()));
-
-        if (aKeyRange->UpperOpen()) {
-          Append(kCloseParen);
-        } else {
-          Append(kCloseBracket);
-        }
-      }
-    } else {
-      AssignLiteral("<undefined>");
-    }
-  }
-
-  explicit LoggingString(const Key& aKey) {
-    if (aKey.IsUnset()) {
-      AssignLiteral("<undefined>");
-    } else if (aKey.IsFloat()) {
-      AppendPrintf("%g", aKey.ToFloat());
-    } else if (aKey.IsDate()) {
-      AppendPrintf("<Date %g>", aKey.ToDateMsec());
-    } else if (aKey.IsString()) {
-      AppendPrintf("\"%s\"", NS_ConvertUTF16toUTF8(aKey.ToString()).get());
-    } else if (aKey.IsBinary()) {
-      AssignLiteral("[object ArrayBuffer]");
-    } else {
-      MOZ_ASSERT(aKey.IsArray());
-      AssignLiteral("[...]");
-    }
-  }
-
-  explicit LoggingString(const IDBCursorDirection aDirection) {
-    switch (aDirection) {
-      case IDBCursorDirection::Next:
-        AssignLiteral("\"next\"");
-        break;
-      case IDBCursorDirection::Nextunique:
-        AssignLiteral("\"nextunique\"");
-        break;
-      case IDBCursorDirection::Prev:
-        AssignLiteral("\"prev\"");
-        break;
-      case IDBCursorDirection::Prevunique:
-        AssignLiteral("\"prevunique\"");
-        break;
-      default:
-        MOZ_CRASH("Unknown direction!");
-    };
-  }
-
-  explicit LoggingString(const Optional<uint64_t>& aVersion) {
-    if (aVersion.WasPassed()) {
-      AppendInt(aVersion.Value());
-    } else {
-      AssignLiteral("<undefined>");
-    }
-  }
-
-  explicit LoggingString(const Optional<uint32_t>& aLimit) {
-    if (aLimit.WasPassed()) {
-      AppendInt(aLimit.Value());
-    } else {
-      AssignLiteral("<undefined>");
-    }
-  }
-
-  LoggingString(IDBObjectStore* aObjectStore, const Key& aKey) {
-    MOZ_ASSERT(aObjectStore);
-
-    if (!aObjectStore->HasValidKeyPath()) {
-      Append(LoggingString(aKey));
-    }
-  }
-
-  LoggingString(Event* aEvent, const char16_t* aDefault)
-      : nsAutoCString(kQuote) {
-    MOZ_ASSERT(aDefault);
-
-    nsAutoString eventType;
-
-    if (aEvent) {
-      aEvent->GetType(eventType);
-    } else {
-      eventType = nsDependentString(aDefault);
-    }
-
-    AppendUTF16toUTF8(eventType, *this);
-    Append(kQuote);
-  }
+  LoggingString(IDBObjectStore* aObjectStore, const Key& aKey);
+  LoggingString(Event* aEvent, const char16_t* aDefault);
 };
 
-inline void MOZ_FORMAT_PRINTF(2, 3)
-    LoggingHelper(bool aUseProfiler, const char* aFmt, ...) {
-  MOZ_ASSERT(IndexedDatabaseManager::GetLoggingMode() !=
-             IndexedDatabaseManager::Logging_Disabled);
-  MOZ_ASSERT(aFmt);
-
-  mozilla::LogModule* logModule = IndexedDatabaseManager::GetLoggingModule();
-  MOZ_ASSERT(logModule);
-
-  static const mozilla::LogLevel logLevel = LogLevel::Warning;
-
-  if (MOZ_LOG_TEST(logModule, logLevel) ||
-#ifdef MOZ_GECKO_PROFILER
-      (aUseProfiler && profiler_thread_is_being_profiled())
-#else
-      false
-#endif
-  ) {
-    nsAutoCString message;
-
-    {
-      va_list args;
-      va_start(args, aFmt);
-
-      message.AppendPrintf(aFmt, args);
-
-      va_end(args);
-    }
-
-    MOZ_LOG(logModule, logLevel, ("%s", message.get()));
-
-    if (aUseProfiler) {
-      PROFILER_ADD_MARKER(message.get(), DOM);
-    }
-  }
-}
+void MOZ_FORMAT_PRINTF(2, 3)
+    LoggingHelper(bool aUseProfiler, const char* aFmt, ...);
 
 }  // namespace indexedDB
 }  // namespace dom
diff --git a/dom/indexedDB/moz.build b/dom/indexedDB/moz.build
index 4906a4b44a97..4ceeb11e9a25 100644
--- a/dom/indexedDB/moz.build
+++ b/dom/indexedDB/moz.build
@@ -74,6 +74,7 @@ UNIFIED_SOURCES += [
     'IndexedDatabaseManager.cpp',
     'KeyPath.cpp',
     'PermissionRequestBase.cpp',
+    'ProfilerHelpers.cpp',
     'ReportInternalError.cpp',
     'ScriptErrorHelper.cpp',
 ]