Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

23 files changed, 2519 insertions, 0 deletions

diff --git a/dom/filesystem/compat/CallbackRunnables.cpp b/dom/filesystem/compat/CallbackRunnables.cpp
new file mode 100644
index 0000000000..cbdd2f2f56
--- /dev/null
+++ b/dom/filesystem/compat/CallbackRunnables.cpp
@@ -0,0 +1,280 @@
+/* -*- 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 "CallbackRunnables.h"
+#include "mozilla/dom/Directory.h"
+#include "mozilla/dom/DirectoryBinding.h"
+#include "mozilla/dom/DOMException.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/FileBinding.h"
+#include "mozilla/dom/FileSystem.h"
+#include "mozilla/dom/FileSystemDirectoryReaderBinding.h"
+#include "mozilla/dom/FileSystemFileEntry.h"
+#include "mozilla/dom/FileSystemUtils.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/Unused.h"
+#include "nsIGlobalObject.h"
+#include "nsIFile.h"
+#include "nsPIDOMWindow.h"
+
+#include "../GetFileOrDirectoryTask.h"
+
+namespace mozilla::dom {
+
+EntryCallbackRunnable::EntryCallbackRunnable(FileSystemEntryCallback* aCallback,
+                                             FileSystemEntry* aEntry)
+    : Runnable("EntryCallbackRunnable"), mCallback(aCallback), mEntry(aEntry) {
+  MOZ_ASSERT(aCallback);
+  MOZ_ASSERT(aEntry);
+}
+
+NS_IMETHODIMP
+EntryCallbackRunnable::Run() {
+  mCallback->Call(*mEntry);
+  return NS_OK;
+}
+
+ErrorCallbackRunnable::ErrorCallbackRunnable(nsIGlobalObject* aGlobalObject,
+                                             ErrorCallback* aCallback,
+                                             nsresult aError)
+    : Runnable("ErrorCallbackRunnable"),
+      mGlobal(aGlobalObject),
+      mCallback(aCallback),
+      mError(aError) {
+  MOZ_ASSERT(aGlobalObject);
+  MOZ_ASSERT(aCallback);
+  MOZ_ASSERT(NS_FAILED(aError));
+}
+
+NS_IMETHODIMP
+ErrorCallbackRunnable::Run() {
+  RefPtr<DOMException> exception = DOMException::Create(mError);
+  mCallback->Call(*exception);
+  return NS_OK;
+}
+
+EmptyEntriesCallbackRunnable::EmptyEntriesCallbackRunnable(
+    FileSystemEntriesCallback* aCallback)
+    : Runnable("EmptyEntriesCallbackRunnable"), mCallback(aCallback) {
+  MOZ_ASSERT(aCallback);
+}
+
+NS_IMETHODIMP
+EmptyEntriesCallbackRunnable::Run() {
+  Sequence<OwningNonNull<FileSystemEntry>> sequence;
+  mCallback->Call(sequence);
+  return NS_OK;
+}
+
+GetEntryHelper::GetEntryHelper(FileSystemDirectoryEntry* aParentEntry,
+                               Directory* aDirectory,
+                               nsTArray<nsString>& aParts,
+                               FileSystem* aFileSystem,
+                               FileSystemEntryCallback* aSuccessCallback,
+                               ErrorCallback* aErrorCallback,
+                               FileSystemDirectoryEntry::GetInternalType aType)
+    : mParentEntry(aParentEntry),
+      mDirectory(aDirectory),
+      mParts(aParts.Clone()),
+      mFileSystem(aFileSystem),
+      mSuccessCallback(aSuccessCallback),
+      mErrorCallback(aErrorCallback),
+      mType(aType) {
+  MOZ_ASSERT(aParentEntry);
+  MOZ_ASSERT(aDirectory);
+  MOZ_ASSERT(!aParts.IsEmpty());
+  MOZ_ASSERT(aFileSystem);
+  MOZ_ASSERT(aSuccessCallback || aErrorCallback);
+}
+
+GetEntryHelper::~GetEntryHelper() = default;
+
+namespace {
+
+nsresult DOMPathToRealPath(Directory* aDirectory, const nsAString& aPath,
+                           nsIFile** aFile) {
+  nsString relativePath;
+  relativePath = aPath;
+
+  // Trim white spaces.
+  static const char kWhitespace[] = "\b\t\r\n ";
+  relativePath.Trim(kWhitespace);
+
+  nsTArray<nsString> parts;
+  if (!FileSystemUtils::IsValidRelativeDOMPath(relativePath, parts)) {
+    return NS_ERROR_DOM_FILESYSTEM_INVALID_PATH_ERR;
+  }
+
+  nsCOMPtr<nsIFile> file;
+  nsresult rv = aDirectory->GetInternalNsIFile()->Clone(getter_AddRefs(file));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  for (uint32_t i = 0; i < parts.Length(); ++i) {
+    rv = file->AppendRelativePath(parts[i]);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+
+  file.forget(aFile);
+  return NS_OK;
+}
+
+}  // namespace
+
+void GetEntryHelper::Run() {
+  MOZ_ASSERT(!mParts.IsEmpty());
+
+  nsCOMPtr<nsIFile> realPath;
+  nsresult error =
+      DOMPathToRealPath(mDirectory, mParts[0], getter_AddRefs(realPath));
+
+  ErrorResult rv;
+  RefPtr<FileSystemBase> fs = mDirectory->GetFileSystem(rv);
+  if (NS_WARN_IF(rv.Failed())) {
+    rv.SuppressException();
+    Error(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return;
+  }
+
+  RefPtr<GetFileOrDirectoryTaskChild> task =
+      GetFileOrDirectoryTaskChild::Create(fs, realPath, rv);
+  if (NS_WARN_IF(rv.Failed())) {
+    rv.SuppressException();
+    Error(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return;
+  }
+
+  task->SetError(error);
+  task->Start();
+
+  RefPtr<Promise> promise = task->GetPromise();
+
+  mParts.RemoveElementAt(0);
+  promise->AppendNativeHandler(this);
+}
+
+void GetEntryHelper::ResolvedCallback(JSContext* aCx,
+                                      JS::Handle<JS::Value> aValue,
+                                      ErrorResult& aRv) {
+  if (NS_WARN_IF(!aValue.isObject())) {
+    return;
+  }
+
+  JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
+
+  // This is not the last part of the path.
+  if (!mParts.IsEmpty()) {
+    ContinueRunning(obj);
+    return;
+  }
+
+  CompleteOperation(obj);
+}
+
+void GetEntryHelper::CompleteOperation(JSObject* aObj) {
+  MOZ_ASSERT(mParts.IsEmpty());
+
+  if (mType == FileSystemDirectoryEntry::eGetFile) {
+    RefPtr<File> file;
+    if (NS_FAILED(UNWRAP_OBJECT(File, aObj, file))) {
+      Error(NS_ERROR_DOM_TYPE_MISMATCH_ERR);
+      return;
+    }
+
+    RefPtr<FileSystemFileEntry> entry = new FileSystemFileEntry(
+        mParentEntry->GetParentObject(), file, mParentEntry, mFileSystem);
+    mSuccessCallback->Call(*entry);
+    return;
+  }
+
+  MOZ_ASSERT(mType == FileSystemDirectoryEntry::eGetDirectory);
+
+  RefPtr<Directory> directory;
+  if (NS_FAILED(UNWRAP_OBJECT(Directory, aObj, directory))) {
+    Error(NS_ERROR_DOM_TYPE_MISMATCH_ERR);
+    return;
+  }
+
+  RefPtr<FileSystemDirectoryEntry> entry = new FileSystemDirectoryEntry(
+      mParentEntry->GetParentObject(), directory, mParentEntry, mFileSystem);
+  mSuccessCallback->Call(*entry);
+}
+
+void GetEntryHelper::ContinueRunning(JSObject* aObj) {
+  MOZ_ASSERT(!mParts.IsEmpty());
+
+  RefPtr<Directory> directory;
+  if (NS_FAILED(UNWRAP_OBJECT(Directory, aObj, directory))) {
+    Error(NS_ERROR_DOM_TYPE_MISMATCH_ERR);
+    return;
+  }
+
+  RefPtr<FileSystemDirectoryEntry> entry = new FileSystemDirectoryEntry(
+      mParentEntry->GetParentObject(), directory, mParentEntry, mFileSystem);
+
+  // Update the internal values.
+  mParentEntry = entry;
+  mDirectory = directory;
+
+  Run();
+}
+
+void GetEntryHelper::RejectedCallback(JSContext* aCx,
+                                      JS::Handle<JS::Value> aValue,
+                                      ErrorResult& aRv) {
+  Error(NS_ERROR_DOM_NOT_FOUND_ERR);
+}
+
+void GetEntryHelper::Error(nsresult aError) {
+  MOZ_ASSERT(NS_FAILED(aError));
+
+  if (mErrorCallback) {
+    RefPtr<ErrorCallbackRunnable> runnable = new ErrorCallbackRunnable(
+        mParentEntry->GetParentObject(), mErrorCallback, aError);
+
+    FileSystemUtils::DispatchRunnable(mParentEntry->GetParentObject(),
+                                      runnable.forget());
+  }
+}
+
+NS_IMPL_ISUPPORTS0(GetEntryHelper);
+
+/* static */
+void FileSystemEntryCallbackHelper::Call(
+    nsIGlobalObject* aGlobalObject,
+    const Optional<OwningNonNull<FileSystemEntryCallback>>& aEntryCallback,
+    FileSystemEntry* aEntry) {
+  MOZ_ASSERT(aGlobalObject);
+  MOZ_ASSERT(aEntry);
+
+  if (aEntryCallback.WasPassed()) {
+    RefPtr<EntryCallbackRunnable> runnable =
+        new EntryCallbackRunnable(&aEntryCallback.Value(), aEntry);
+
+    FileSystemUtils::DispatchRunnable(aGlobalObject, runnable.forget());
+  }
+}
+
+/* static */
+void ErrorCallbackHelper::Call(
+    nsIGlobalObject* aGlobal,
+    const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+    nsresult aError) {
+  MOZ_ASSERT(aGlobal);
+  MOZ_ASSERT(NS_FAILED(aError));
+
+  if (aErrorCallback.WasPassed()) {
+    RefPtr<ErrorCallbackRunnable> runnable =
+        new ErrorCallbackRunnable(aGlobal, &aErrorCallback.Value(), aError);
+
+    FileSystemUtils::DispatchRunnable(aGlobal, runnable.forget());
+  }
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/filesystem/compat/CallbackRunnables.h b/dom/filesystem/compat/CallbackRunnables.h
new file mode 100644
index 0000000000..e2e1c47913
--- /dev/null
+++ b/dom/filesystem/compat/CallbackRunnables.h
@@ -0,0 +1,118 @@
+/* -*- 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_ErrorCallbackRunnable_h
+#define mozilla_dom_ErrorCallbackRunnable_h
+
+#include "FileSystemDirectoryEntry.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/PromiseNativeHandler.h"
+#include "nsThreadUtils.h"
+
+class nsIGlobalObject;
+
+namespace mozilla::dom {
+
+class FileSystemEntriesCallback;
+
+class EntryCallbackRunnable final : public Runnable {
+ public:
+  EntryCallbackRunnable(FileSystemEntryCallback* aCallback,
+                        FileSystemEntry* aEntry);
+
+  // MOZ_CAN_RUN_SCRIPT_BOUNDARY until Runnable::Run is MOZ_CAN_RUN_SCRIPT.  See
+  // bug 1535398.
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD Run() override;
+
+ private:
+  const RefPtr<FileSystemEntryCallback> mCallback;
+  const RefPtr<FileSystemEntry> mEntry;
+};
+
+class ErrorCallbackRunnable final : public Runnable {
+ public:
+  ErrorCallbackRunnable(nsIGlobalObject* aGlobalObject,
+                        ErrorCallback* aCallback, nsresult aError);
+
+  // MOZ_CAN_RUN_SCRIPT_BOUNDARY until Runnable::Run is MOZ_CAN_RUN_SCRIPT.  See
+  // bug 1535398.
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD Run() override;
+
+ private:
+  nsCOMPtr<nsIGlobalObject> mGlobal;
+  const RefPtr<ErrorCallback> mCallback;
+  nsresult mError;
+};
+
+class EmptyEntriesCallbackRunnable final : public Runnable {
+ public:
+  explicit EmptyEntriesCallbackRunnable(FileSystemEntriesCallback* aCallback);
+
+  // MOZ_CAN_RUN_SCRIPT_BOUNDARY until Runnable::Run is MOZ_CAN_RUN_SCRIPT.  See
+  // bug 1535398.
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD Run() override;
+
+ private:
+  const RefPtr<FileSystemEntriesCallback> mCallback;
+};
+
+class GetEntryHelper final : public PromiseNativeHandler {
+ public:
+  NS_DECL_ISUPPORTS
+
+  GetEntryHelper(FileSystemDirectoryEntry* aParentEntry, Directory* aDirectory,
+                 nsTArray<nsString>& aParts, FileSystem* aFileSystem,
+                 FileSystemEntryCallback* aSuccessCallback,
+                 ErrorCallback* aErrorCallback,
+                 FileSystemDirectoryEntry::GetInternalType aType);
+
+  void Run();
+
+  MOZ_CAN_RUN_SCRIPT
+  virtual void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                                ErrorResult& aRv) override;
+
+  virtual void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                                ErrorResult& aRv) override;
+
+ private:
+  ~GetEntryHelper();
+
+  void Error(nsresult aError);
+
+  void ContinueRunning(JSObject* aObj);
+
+  MOZ_CAN_RUN_SCRIPT void CompleteOperation(JSObject* aObj);
+
+  RefPtr<FileSystemDirectoryEntry> mParentEntry;
+  RefPtr<Directory> mDirectory;
+  nsTArray<nsString> mParts;
+  RefPtr<FileSystem> mFileSystem;
+
+  const RefPtr<FileSystemEntryCallback> mSuccessCallback;
+  RefPtr<ErrorCallback> mErrorCallback;
+
+  FileSystemDirectoryEntry::GetInternalType mType;
+};
+
+class FileSystemEntryCallbackHelper {
+ public:
+  static void Call(
+      nsIGlobalObject* aGlobalObject,
+      const Optional<OwningNonNull<FileSystemEntryCallback>>& aEntryCallback,
+      FileSystemEntry* aEntry);
+};
+
+class ErrorCallbackHelper {
+ public:
+  static void Call(nsIGlobalObject* aGlobal,
+                   const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+                   nsresult aError);
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_CallbackRunnables_h
diff --git a/dom/filesystem/compat/FileSystem.cpp b/dom/filesystem/compat/FileSystem.cpp
new file mode 100644
index 0000000000..734b3ec600
--- /dev/null
+++ b/dom/filesystem/compat/FileSystem.cpp
@@ -0,0 +1,60 @@
+/* -*- 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 "FileSystem.h"
+#include "FileSystemRootDirectoryEntry.h"
+#include "mozilla/dom/FileSystemBinding.h"
+#include "nsIDUtils.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(FileSystem, mParent, mRoot)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(FileSystem)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(FileSystem)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FileSystem)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+/* static */
+already_AddRefed<FileSystem> FileSystem::Create(nsIGlobalObject* aGlobalObject)
+
+{
+  MOZ_ASSERT(aGlobalObject);
+
+  nsID id;
+  nsresult rv = nsID::GenerateUUIDInPlace(id);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return nullptr;
+  }
+
+  NSID_TrimBracketsUTF16 name(id);
+
+  RefPtr<FileSystem> fs = new FileSystem(aGlobalObject, name);
+
+  return fs.forget();
+}
+
+FileSystem::FileSystem(nsIGlobalObject* aGlobal, const nsAString& aName)
+    : mParent(aGlobal), mName(aName) {
+  MOZ_ASSERT(aGlobal);
+}
+
+FileSystem::~FileSystem() = default;
+
+JSObject* FileSystem::WrapObject(JSContext* aCx,
+                                 JS::Handle<JSObject*> aGivenProto) {
+  return FileSystem_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void FileSystem::CreateRoot(const Sequence<RefPtr<FileSystemEntry>>& aEntries) {
+  MOZ_ASSERT(!mRoot);
+  mRoot = new FileSystemRootDirectoryEntry(mParent, aEntries, this);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/filesystem/compat/FileSystem.h b/dom/filesystem/compat/FileSystem.h
new file mode 100644
index 0000000000..92cb563ef4
--- /dev/null
+++ b/dom/filesystem/compat/FileSystem.h
@@ -0,0 +1,52 @@
+/* -*- 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_FileSystem_h
+#define mozilla_dom_FileSystem_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsWrapperCache.h"
+
+class nsIGlobalObject;
+
+namespace mozilla::dom {
+
+class FileSystemDirectoryEntry;
+class FileSystemEntry;
+class OwningFileOrDirectory;
+
+class FileSystem final : public nsISupports, public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(FileSystem)
+
+  static already_AddRefed<FileSystem> Create(nsIGlobalObject* aGlobalObject);
+
+  nsIGlobalObject* GetParentObject() const { return mParent; }
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  void GetName(nsAString& aName) const { aName = mName; }
+
+  FileSystemDirectoryEntry* Root() const { return mRoot; }
+
+  void CreateRoot(const Sequence<RefPtr<FileSystemEntry>>& aEntries);
+
+ private:
+  explicit FileSystem(nsIGlobalObject* aGlobalObject, const nsAString& aName);
+  ~FileSystem();
+
+  nsCOMPtr<nsIGlobalObject> mParent;
+  RefPtr<FileSystemDirectoryEntry> mRoot;
+  nsString mName;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_FileSystem_h
diff --git a/dom/filesystem/compat/FileSystemDirectoryEntry.cpp b/dom/filesystem/compat/FileSystemDirectoryEntry.cpp
new file mode 100644
index 0000000000..7358f997f0
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemDirectoryEntry.cpp
@@ -0,0 +1,92 @@
+/* -*- 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 "FileSystemDirectoryEntry.h"
+#include "CallbackRunnables.h"
+#include "FileSystemDirectoryReader.h"
+#include "mozilla/dom/Directory.h"
+#include "mozilla/dom/FileSystemDirectoryEntryBinding.h"
+#include "mozilla/dom/FileSystemUtils.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(FileSystemDirectoryEntry, FileSystemEntry,
+                                   mDirectory)
+
+NS_IMPL_ADDREF_INHERITED(FileSystemDirectoryEntry, FileSystemEntry)
+NS_IMPL_RELEASE_INHERITED(FileSystemDirectoryEntry, FileSystemEntry)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FileSystemDirectoryEntry)
+NS_INTERFACE_MAP_END_INHERITING(FileSystemEntry)
+
+FileSystemDirectoryEntry::FileSystemDirectoryEntry(
+    nsIGlobalObject* aGlobal, Directory* aDirectory,
+    FileSystemDirectoryEntry* aParentEntry, FileSystem* aFileSystem)
+    : FileSystemEntry(aGlobal, aParentEntry, aFileSystem),
+      mDirectory(aDirectory) {
+  MOZ_ASSERT(aGlobal);
+}
+
+FileSystemDirectoryEntry::~FileSystemDirectoryEntry() = default;
+
+JSObject* FileSystemDirectoryEntry::WrapObject(
+    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+  return FileSystemDirectoryEntry_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void FileSystemDirectoryEntry::GetName(nsAString& aName,
+                                       ErrorResult& aRv) const {
+  MOZ_ASSERT(mDirectory);
+  mDirectory->GetName(aName, aRv);
+}
+
+void FileSystemDirectoryEntry::GetFullPath(nsAString& aPath,
+                                           ErrorResult& aRv) const {
+  MOZ_ASSERT(mDirectory);
+  mDirectory->GetPath(aPath, aRv);
+}
+
+already_AddRefed<FileSystemDirectoryReader>
+FileSystemDirectoryEntry::CreateReader() {
+  MOZ_ASSERT(mDirectory);
+
+  RefPtr<FileSystemDirectoryReader> reader =
+      new FileSystemDirectoryReader(this, Filesystem(), mDirectory);
+  return reader.forget();
+}
+
+void FileSystemDirectoryEntry::GetInternal(
+    const nsAString& aPath, const FileSystemFlags& aFlag,
+    const Optional<OwningNonNull<FileSystemEntryCallback>>& aSuccessCallback,
+    const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+    GetInternalType aType) {
+  MOZ_ASSERT(mDirectory);
+
+  if (!aSuccessCallback.WasPassed() && !aErrorCallback.WasPassed()) {
+    return;
+  }
+
+  if (aFlag.mCreate) {
+    ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
+                              NS_ERROR_DOM_SECURITY_ERR);
+    return;
+  }
+
+  nsTArray<nsString> parts;
+  if (!FileSystemUtils::IsValidRelativeDOMPath(aPath, parts)) {
+    ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
+                              NS_ERROR_DOM_NOT_FOUND_ERR);
+    return;
+  }
+
+  RefPtr<GetEntryHelper> helper = new GetEntryHelper(
+      this, mDirectory, parts, Filesystem(),
+      aSuccessCallback.WasPassed() ? &aSuccessCallback.Value() : nullptr,
+      aErrorCallback.WasPassed() ? &aErrorCallback.Value() : nullptr, aType);
+  helper->Run();
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/filesystem/compat/FileSystemDirectoryEntry.h b/dom/filesystem/compat/FileSystemDirectoryEntry.h
new file mode 100644
index 0000000000..1b772691e1
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemDirectoryEntry.h
@@ -0,0 +1,73 @@
+/* -*- 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_FileSystemDirectoryEntry_h
+#define mozilla_dom_FileSystemDirectoryEntry_h
+
+#include "mozilla/dom/FileSystemEntry.h"
+
+namespace mozilla::dom {
+
+class Directory;
+class FileSystemDirectoryReader;
+
+class FileSystemDirectoryEntry : public FileSystemEntry {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(FileSystemDirectoryEntry,
+                                           FileSystemEntry)
+
+  FileSystemDirectoryEntry(nsIGlobalObject* aGlobalObject,
+                           Directory* aDirectory,
+                           FileSystemDirectoryEntry* aParentEntry,
+                           FileSystem* aFileSystem);
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  virtual bool IsDirectory() const override { return true; }
+
+  virtual void GetName(nsAString& aName, ErrorResult& aRv) const override;
+
+  virtual void GetFullPath(nsAString& aFullPath,
+                           ErrorResult& aRv) const override;
+
+  virtual already_AddRefed<FileSystemDirectoryReader> CreateReader();
+
+  void GetFile(
+      const Optional<nsAString>& aPath, const FileSystemFlags& aFlag,
+      const Optional<OwningNonNull<FileSystemEntryCallback>>& aSuccessCallback,
+      const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback) {
+    GetInternal(aPath.WasPassed() ? aPath.Value() : u""_ns, aFlag,
+                aSuccessCallback, aErrorCallback, eGetFile);
+  }
+
+  void GetDirectory(
+      const Optional<nsAString>& aPath, const FileSystemFlags& aFlag,
+      const Optional<OwningNonNull<FileSystemEntryCallback>>& aSuccessCallback,
+      const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback) {
+    GetInternal(aPath.WasPassed() ? aPath.Value() : u""_ns, aFlag,
+                aSuccessCallback, aErrorCallback, eGetDirectory);
+  }
+
+  enum GetInternalType { eGetFile, eGetDirectory };
+
+  virtual void GetInternal(
+      const nsAString& aPath, const FileSystemFlags& aFlag,
+      const Optional<OwningNonNull<FileSystemEntryCallback>>& aSuccessCallback,
+      const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+      GetInternalType aType);
+
+ protected:
+  virtual ~FileSystemDirectoryEntry();
+
+ private:
+  RefPtr<Directory> mDirectory;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_FileSystemDirectoryEntry_h
diff --git a/dom/filesystem/compat/FileSystemDirectoryReader.cpp b/dom/filesystem/compat/FileSystemDirectoryReader.cpp
new file mode 100644
index 0000000000..533faae413
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemDirectoryReader.cpp
@@ -0,0 +1,181 @@
+/* -*- 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 "FileSystemDirectoryReader.h"
+#include "CallbackRunnables.h"
+#include "FileSystemFileEntry.h"
+#include "js/Array.h"               // JS::NewArrayObject
+#include "js/PropertyAndElement.h"  // JS_GetElement
+#include "mozilla/dom/FileBinding.h"
+#include "mozilla/dom/FileSystem.h"
+#include "mozilla/dom/FileSystemDirectoryReaderBinding.h"
+#include "mozilla/dom/FileSystemUtils.h"
+#include "mozilla/dom/Directory.h"
+#include "mozilla/dom/DirectoryBinding.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/PromiseNativeHandler.h"
+
+namespace mozilla::dom {
+
+namespace {
+
+class PromiseHandler final : public PromiseNativeHandler {
+ public:
+  NS_DECL_ISUPPORTS
+
+  PromiseHandler(FileSystemDirectoryEntry* aParentEntry,
+                 FileSystem* aFileSystem,
+                 FileSystemEntriesCallback* aSuccessCallback,
+                 ErrorCallback* aErrorCallback)
+      : mParentEntry(aParentEntry),
+        mFileSystem(aFileSystem),
+        mSuccessCallback(aSuccessCallback),
+        mErrorCallback(aErrorCallback) {
+    MOZ_ASSERT(aParentEntry);
+    MOZ_ASSERT(aFileSystem);
+    MOZ_ASSERT(aSuccessCallback);
+  }
+
+  MOZ_CAN_RUN_SCRIPT
+  virtual void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                                ErrorResult& aRv) override {
+    if (NS_WARN_IF(!aValue.isObject())) {
+      return;
+    }
+
+    JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
+
+    uint32_t length;
+    if (NS_WARN_IF(!JS::GetArrayLength(aCx, obj, &length))) {
+      return;
+    }
+
+    Sequence<OwningNonNull<FileSystemEntry>> sequence;
+    if (NS_WARN_IF(!sequence.SetLength(length, fallible))) {
+      return;
+    }
+
+    for (uint32_t i = 0; i < length; ++i) {
+      JS::Rooted<JS::Value> value(aCx);
+      if (NS_WARN_IF(!JS_GetElement(aCx, obj, i, &value))) {
+        return;
+      }
+
+      if (NS_WARN_IF(!value.isObject())) {
+        return;
+      }
+
+      JS::Rooted<JSObject*> valueObj(aCx, &value.toObject());
+
+      RefPtr<File> file;
+      if (NS_SUCCEEDED(UNWRAP_OBJECT(File, valueObj, file))) {
+        RefPtr<FileSystemFileEntry> entry = new FileSystemFileEntry(
+            mParentEntry->GetParentObject(), file, mParentEntry, mFileSystem);
+        sequence[i] = entry;
+        continue;
+      }
+
+      RefPtr<Directory> directory;
+      if (NS_WARN_IF(
+              NS_FAILED(UNWRAP_OBJECT(Directory, valueObj, directory)))) {
+        return;
+      }
+
+      RefPtr<FileSystemDirectoryEntry> entry =
+          new FileSystemDirectoryEntry(mParentEntry->GetParentObject(),
+                                       directory, mParentEntry, mFileSystem);
+      sequence[i] = entry;
+    }
+
+    mSuccessCallback->Call(sequence);
+  }
+
+  virtual void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
+                                ErrorResult& aRv) override {
+    if (mErrorCallback) {
+      RefPtr<ErrorCallbackRunnable> runnable = new ErrorCallbackRunnable(
+          mParentEntry->GetParentObject(), mErrorCallback,
+          NS_ERROR_DOM_INVALID_STATE_ERR);
+
+      FileSystemUtils::DispatchRunnable(mParentEntry->GetParentObject(),
+                                        runnable.forget());
+    }
+  }
+
+ private:
+  ~PromiseHandler() = default;
+
+  RefPtr<FileSystemDirectoryEntry> mParentEntry;
+  RefPtr<FileSystem> mFileSystem;
+  const RefPtr<FileSystemEntriesCallback> mSuccessCallback;
+  RefPtr<ErrorCallback> mErrorCallback;
+};
+
+NS_IMPL_ISUPPORTS0(PromiseHandler);
+
+}  // anonymous namespace
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(FileSystemDirectoryReader, mParentEntry,
+                                      mDirectory, mFileSystem)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(FileSystemDirectoryReader)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(FileSystemDirectoryReader)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FileSystemDirectoryReader)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+FileSystemDirectoryReader::FileSystemDirectoryReader(
+    FileSystemDirectoryEntry* aParentEntry, FileSystem* aFileSystem,
+    Directory* aDirectory)
+    : mParentEntry(aParentEntry),
+      mFileSystem(aFileSystem),
+      mDirectory(aDirectory),
+      mAlreadyRead(false) {
+  MOZ_ASSERT(aParentEntry);
+  MOZ_ASSERT(aFileSystem);
+}
+
+FileSystemDirectoryReader::~FileSystemDirectoryReader() = default;
+
+JSObject* FileSystemDirectoryReader::WrapObject(
+    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+  return FileSystemDirectoryReader_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void FileSystemDirectoryReader::ReadEntries(
+    FileSystemEntriesCallback& aSuccessCallback,
+    const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+    ErrorResult& aRv) {
+  MOZ_ASSERT(mDirectory);
+
+  if (mAlreadyRead) {
+    RefPtr<EmptyEntriesCallbackRunnable> runnable =
+        new EmptyEntriesCallbackRunnable(&aSuccessCallback);
+
+    FileSystemUtils::DispatchRunnable(GetParentObject(), runnable.forget());
+    return;
+  }
+
+  // This object can be used only once.
+  mAlreadyRead = true;
+
+  ErrorResult rv;
+  RefPtr<Promise> promise = mDirectory->GetFilesAndDirectories(rv);
+  if (NS_WARN_IF(rv.Failed())) {
+    ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
+                              rv.StealNSResult());
+    return;
+  }
+
+  RefPtr<PromiseHandler> handler = new PromiseHandler(
+      mParentEntry, mFileSystem, &aSuccessCallback,
+      aErrorCallback.WasPassed() ? &aErrorCallback.Value() : nullptr);
+  promise->AppendNativeHandler(handler);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/filesystem/compat/FileSystemDirectoryReader.h b/dom/filesystem/compat/FileSystemDirectoryReader.h
new file mode 100644
index 0000000000..90274943b4
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemDirectoryReader.h
@@ -0,0 +1,60 @@
+/* -*- 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_FileSystemDirectoryReader_h
+#define mozilla_dom_FileSystemDirectoryReader_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/FileSystemDirectoryEntry.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsWrapperCache.h"
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+
+class Directory;
+class FileSystem;
+class FileSystemEntriesCallback;
+
+class FileSystemDirectoryReader : public nsISupports, public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(FileSystemDirectoryReader)
+
+  explicit FileSystemDirectoryReader(FileSystemDirectoryEntry* aDirectoryEntry,
+                                     FileSystem* aFileSystem,
+                                     Directory* aDirectory);
+
+  nsIGlobalObject* GetParentObject() const {
+    return mParentEntry->GetParentObject();
+  }
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  virtual void ReadEntries(
+      FileSystemEntriesCallback& aSuccessCallback,
+      const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+      ErrorResult& aRv);
+
+ protected:
+  virtual ~FileSystemDirectoryReader();
+
+ private:
+  RefPtr<FileSystemDirectoryEntry> mParentEntry;
+  RefPtr<FileSystem> mFileSystem;
+  RefPtr<Directory> mDirectory;
+
+  bool mAlreadyRead;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_FileSystemDirectoryReader_h
diff --git a/dom/filesystem/compat/FileSystemEntry.cpp b/dom/filesystem/compat/FileSystemEntry.cpp
new file mode 100644
index 0000000000..3a69e2537a
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemEntry.cpp
@@ -0,0 +1,80 @@
+/* -*- 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 "FileSystemEntry.h"
+#include "CallbackRunnables.h"
+#include "FileSystem.h"
+#include "FileSystemDirectoryEntry.h"
+#include "FileSystemFileEntry.h"
+#include "mozilla/dom/FileSystemEntryBinding.h"
+#include "mozilla/dom/UnionTypes.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(FileSystemEntry, mParent, mParentEntry,
+                                      mFileSystem)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(FileSystemEntry)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(FileSystemEntry)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FileSystemEntry)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+/* static */
+already_AddRefed<FileSystemEntry> FileSystemEntry::Create(
+    nsIGlobalObject* aGlobalObject,
+    const OwningFileOrDirectory& aFileOrDirectory, FileSystem* aFileSystem) {
+  MOZ_ASSERT(aGlobalObject);
+  MOZ_ASSERT(aFileSystem);
+
+  RefPtr<FileSystemEntry> entry;
+  if (aFileOrDirectory.IsFile()) {
+    entry = new FileSystemFileEntry(aGlobalObject, aFileOrDirectory.GetAsFile(),
+                                    nullptr, aFileSystem);
+  } else {
+    MOZ_ASSERT(aFileOrDirectory.IsDirectory());
+    entry = new FileSystemDirectoryEntry(
+        aGlobalObject, aFileOrDirectory.GetAsDirectory(), nullptr, aFileSystem);
+  }
+
+  return entry.forget();
+}
+
+FileSystemEntry::FileSystemEntry(nsIGlobalObject* aGlobal,
+                                 FileSystemEntry* aParentEntry,
+                                 FileSystem* aFileSystem)
+    : mParent(aGlobal), mParentEntry(aParentEntry), mFileSystem(aFileSystem) {
+  MOZ_ASSERT(aGlobal);
+  MOZ_ASSERT(aFileSystem);
+}
+
+FileSystemEntry::~FileSystemEntry() = default;
+
+JSObject* FileSystemEntry::WrapObject(JSContext* aCx,
+                                      JS::Handle<JSObject*> aGivenProto) {
+  return FileSystemEntry_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void FileSystemEntry::GetParent(
+    const Optional<OwningNonNull<FileSystemEntryCallback>>& aSuccessCallback,
+    const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback) {
+  if (!aSuccessCallback.WasPassed() && !aErrorCallback.WasPassed()) {
+    return;
+  }
+
+  if (mParentEntry) {
+    FileSystemEntryCallbackHelper::Call(GetParentObject(), aSuccessCallback,
+                                        mParentEntry);
+    return;
+  }
+
+  FileSystemEntryCallbackHelper::Call(GetParentObject(), aSuccessCallback,
+                                      this);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/filesystem/compat/FileSystemEntry.h b/dom/filesystem/compat/FileSystemEntry.h
new file mode 100644
index 0000000000..2275c600a9
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemEntry.h
@@ -0,0 +1,67 @@
+/* -*- 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_FileSystemEntry_h
+#define mozilla_dom_FileSystemEntry_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/FileSystemBinding.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsIGlobalObject.h"
+#include "nsWrapperCache.h"
+
+namespace mozilla {
+class ErrorResult;
+
+namespace dom {
+
+class FileSystem;
+class OwningFileOrDirectory;
+
+class FileSystemEntry : public nsISupports, public nsWrapperCache {
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(FileSystemEntry)
+
+  static already_AddRefed<FileSystemEntry> Create(
+      nsIGlobalObject* aGlobalObject,
+      const OwningFileOrDirectory& aFileOrDirectory, FileSystem* aFileSystem);
+
+  nsIGlobalObject* GetParentObject() const { return mParent; }
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  virtual bool IsFile() const { return false; }
+
+  virtual bool IsDirectory() const { return false; }
+
+  virtual void GetName(nsAString& aName, ErrorResult& aRv) const = 0;
+
+  virtual void GetFullPath(nsAString& aFullPath, ErrorResult& aRv) const = 0;
+
+  void GetParent(
+      const Optional<OwningNonNull<FileSystemEntryCallback>>& aSuccessCallback,
+      const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback);
+
+  FileSystem* Filesystem() const { return mFileSystem; }
+
+ protected:
+  FileSystemEntry(nsIGlobalObject* aGlobalObject, FileSystemEntry* aParentEntry,
+                  FileSystem* aFileSystem);
+  virtual ~FileSystemEntry();
+
+ private:
+  nsCOMPtr<nsIGlobalObject> mParent;
+  RefPtr<FileSystemEntry> mParentEntry;
+  RefPtr<FileSystem> mFileSystem;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_FileSystemEntry_h
diff --git a/dom/filesystem/compat/FileSystemFileEntry.cpp b/dom/filesystem/compat/FileSystemFileEntry.cpp
new file mode 100644
index 0000000000..59216641cc
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemFileEntry.cpp
@@ -0,0 +1,94 @@
+/* -*- 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 "FileSystemFileEntry.h"
+#include "CallbackRunnables.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/FileSystemUtils.h"
+#include "mozilla/dom/MultipartBlobImpl.h"
+#include "mozilla/dom/FileSystemFileEntryBinding.h"
+
+namespace mozilla::dom {
+
+namespace {
+
+class FileCallbackRunnable final : public Runnable {
+ public:
+  FileCallbackRunnable(FileCallback* aCallback, File* aFile)
+      : Runnable("FileCallbackRunnable"), mCallback(aCallback), mFile(aFile) {
+    MOZ_ASSERT(aCallback);
+    MOZ_ASSERT(aFile);
+  }
+
+  // MOZ_CAN_RUN_SCRIPT_BOUNDARY until Runnable::Run is MOZ_CAN_RUN_SCRIPT.  See
+  // bug 1535398.
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD Run() override {
+    // Here we clone the File object.
+
+    RefPtr<File> file = File::Create(mFile->GetParentObject(), mFile->Impl());
+    mCallback->Call(*file);
+    return NS_OK;
+  }
+
+ private:
+  const RefPtr<FileCallback> mCallback;
+  RefPtr<File> mFile;
+};
+
+}  // anonymous namespace
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(FileSystemFileEntry, FileSystemEntry, mFile)
+
+NS_IMPL_ADDREF_INHERITED(FileSystemFileEntry, FileSystemEntry)
+NS_IMPL_RELEASE_INHERITED(FileSystemFileEntry, FileSystemEntry)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FileSystemFileEntry)
+NS_INTERFACE_MAP_END_INHERITING(FileSystemEntry)
+
+FileSystemFileEntry::FileSystemFileEntry(nsIGlobalObject* aGlobal, File* aFile,
+                                         FileSystemDirectoryEntry* aParentEntry,
+                                         FileSystem* aFileSystem)
+    : FileSystemEntry(aGlobal, aParentEntry, aFileSystem), mFile(aFile) {
+  MOZ_ASSERT(aGlobal);
+  MOZ_ASSERT(mFile);
+}
+
+FileSystemFileEntry::~FileSystemFileEntry() = default;
+
+JSObject* FileSystemFileEntry::WrapObject(JSContext* aCx,
+                                          JS::Handle<JSObject*> aGivenProto) {
+  return FileSystemFileEntry_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void FileSystemFileEntry::GetName(nsAString& aName, ErrorResult& aRv) const {
+  mFile->GetName(aName);
+}
+
+void FileSystemFileEntry::GetFullPath(nsAString& aPath,
+                                      ErrorResult& aRv) const {
+  mFile->Impl()->GetDOMPath(aPath);
+  if (aPath.IsEmpty()) {
+    // We're under the root directory. webkitRelativePath
+    // (implemented as GetPath) is for cases when file is selected because its
+    // ancestor directory is selected. But that is not the case here, so need to
+    // manually prepend '/'.
+    nsAutoString name;
+    mFile->GetName(name);
+    aPath.AssignLiteral(FILESYSTEM_DOM_PATH_SEPARATOR_LITERAL);
+    aPath.Append(name);
+  }
+}
+
+void FileSystemFileEntry::GetFile(
+    FileCallback& aSuccessCallback,
+    const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback) const {
+  RefPtr<FileCallbackRunnable> runnable =
+      new FileCallbackRunnable(&aSuccessCallback, mFile);
+
+  FileSystemUtils::DispatchRunnable(GetParentObject(), runnable.forget());
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/filesystem/compat/FileSystemFileEntry.h b/dom/filesystem/compat/FileSystemFileEntry.h
new file mode 100644
index 0000000000..1fe244a66b
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemFileEntry.h
@@ -0,0 +1,49 @@
+/* -*- 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_FileSystemFileEntry_h
+#define mozilla_dom_FileSystemFileEntry_h
+
+#include "mozilla/dom/FileSystemEntry.h"
+
+namespace mozilla::dom {
+
+class File;
+class FileCallback;
+class FileSystemDirectoryEntry;
+
+class FileSystemFileEntry final : public FileSystemEntry {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(FileSystemFileEntry, FileSystemEntry)
+
+  FileSystemFileEntry(nsIGlobalObject* aGlobalObject, File* aFile,
+                      FileSystemDirectoryEntry* aParentEntry,
+                      FileSystem* aFileSystem);
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  virtual bool IsFile() const override { return true; }
+
+  virtual void GetName(nsAString& aName, ErrorResult& aRv) const override;
+
+  virtual void GetFullPath(nsAString& aFullPath,
+                           ErrorResult& aRv) const override;
+
+  void GetFile(
+      FileCallback& aSuccessCallback,
+      const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback) const;
+
+ private:
+  ~FileSystemFileEntry();
+
+  RefPtr<File> mFile;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_FileSystemFileEntry_h
diff --git a/dom/filesystem/compat/FileSystemRootDirectoryEntry.cpp b/dom/filesystem/compat/FileSystemRootDirectoryEntry.cpp
new file mode 100644
index 0000000000..fad6243d15
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemRootDirectoryEntry.cpp
@@ -0,0 +1,138 @@
+/* -*- 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 "FileSystemRootDirectoryEntry.h"
+#include "FileSystemRootDirectoryReader.h"
+#include "mozilla/dom/FileSystemUtils.h"
+#include "CallbackRunnables.h"
+#include "nsReadableUtils.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(FileSystemRootDirectoryEntry,
+                                   FileSystemDirectoryEntry, mEntries)
+
+NS_IMPL_ADDREF_INHERITED(FileSystemRootDirectoryEntry, FileSystemDirectoryEntry)
+NS_IMPL_RELEASE_INHERITED(FileSystemRootDirectoryEntry,
+                          FileSystemDirectoryEntry)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FileSystemRootDirectoryEntry)
+NS_INTERFACE_MAP_END_INHERITING(FileSystemDirectoryEntry)
+
+FileSystemRootDirectoryEntry::FileSystemRootDirectoryEntry(
+    nsIGlobalObject* aGlobal, Sequence<RefPtr<FileSystemEntry>> aEntries,
+    FileSystem* aFileSystem)
+    : FileSystemDirectoryEntry(aGlobal, nullptr, nullptr, aFileSystem),
+      mEntries(std::move(aEntries)) {
+  MOZ_ASSERT(aGlobal);
+}
+
+FileSystemRootDirectoryEntry::~FileSystemRootDirectoryEntry() = default;
+
+void FileSystemRootDirectoryEntry::GetName(nsAString& aName,
+                                           ErrorResult& aRv) const {
+  aName.Truncate();
+}
+
+void FileSystemRootDirectoryEntry::GetFullPath(nsAString& aPath,
+                                               ErrorResult& aRv) const {
+  aPath.AssignLiteral(FILESYSTEM_DOM_PATH_SEPARATOR_LITERAL);
+}
+
+already_AddRefed<FileSystemDirectoryReader>
+FileSystemRootDirectoryEntry::CreateReader() {
+  RefPtr<FileSystemDirectoryReader> reader =
+      new FileSystemRootDirectoryReader(this, Filesystem(), mEntries);
+  return reader.forget();
+}
+
+void FileSystemRootDirectoryEntry::GetInternal(
+    const nsAString& aPath, const FileSystemFlags& aFlag,
+    const Optional<OwningNonNull<FileSystemEntryCallback>>& aSuccessCallback,
+    const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+    GetInternalType aType) {
+  if (!aSuccessCallback.WasPassed() && !aErrorCallback.WasPassed()) {
+    return;
+  }
+
+  if (aFlag.mCreate) {
+    ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
+                              NS_ERROR_DOM_SECURITY_ERR);
+    return;
+  }
+
+  nsTArray<nsString> parts;
+  if (!FileSystemUtils::IsValidRelativeDOMPath(aPath, parts)) {
+    ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
+                              NS_ERROR_DOM_NOT_FOUND_ERR);
+    return;
+  }
+
+  MOZ_ASSERT(!parts.IsEmpty());
+
+  RefPtr<FileSystemEntry> entry;
+  for (uint32_t i = 0; i < mEntries.Length(); ++i) {
+    ErrorResult rv;
+    nsAutoString name;
+    mEntries[i]->GetName(name, rv);
+
+    if (NS_WARN_IF(rv.Failed())) {
+      ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
+                                rv.StealNSResult());
+      return;
+    }
+
+    if (name == parts[0]) {
+      entry = mEntries[i];
+      break;
+    }
+  }
+
+  // Not found.
+  if (!entry) {
+    ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
+                              NS_ERROR_DOM_NOT_FOUND_ERR);
+    return;
+  }
+
+  // No subdirectory in the path.
+  if (parts.Length() == 1) {
+    if ((entry->IsFile() && aType == eGetDirectory) ||
+        (entry->IsDirectory() && aType == eGetFile)) {
+      ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
+                                NS_ERROR_DOM_TYPE_MISMATCH_ERR);
+      return;
+    }
+
+    if (aSuccessCallback.WasPassed()) {
+      RefPtr<EntryCallbackRunnable> runnable =
+          new EntryCallbackRunnable(&aSuccessCallback.Value(), entry);
+
+      FileSystemUtils::DispatchRunnable(GetParentObject(), runnable.forget());
+    }
+    return;
+  }
+
+  // Subdirectories, but this is a file.
+  if (entry->IsFile()) {
+    ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
+                              NS_ERROR_DOM_NOT_FOUND_ERR);
+    return;
+  }
+
+  // Let's recreate a path without the first directory.
+  nsAutoString path;
+  StringJoinAppend(
+      path,
+      NS_LITERAL_STRING_FROM_CSTRING(FILESYSTEM_DOM_PATH_SEPARATOR_LITERAL),
+      Span{parts}.From(1));
+
+  auto* directoryEntry = static_cast<FileSystemDirectoryEntry*>(entry.get());
+  directoryEntry->GetInternal(path, aFlag, aSuccessCallback, aErrorCallback,
+                              aType);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/filesystem/compat/FileSystemRootDirectoryEntry.h b/dom/filesystem/compat/FileSystemRootDirectoryEntry.h
new file mode 100644
index 0000000000..b6ffb976b8
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemRootDirectoryEntry.h
@@ -0,0 +1,48 @@
+/* -*- 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_FileSystemRootDirectoryEntry_h
+#define mozilla_dom_FileSystemRootDirectoryEntry_h
+
+#include "mozilla/dom/FileSystemDirectoryEntry.h"
+
+namespace mozilla::dom {
+
+class FileSystemRootDirectoryEntry final : public FileSystemDirectoryEntry {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(FileSystemRootDirectoryEntry,
+                                           FileSystemDirectoryEntry)
+
+  FileSystemRootDirectoryEntry(nsIGlobalObject* aGlobalObject,
+                               Sequence<RefPtr<FileSystemEntry>> aEntries,
+                               FileSystem* aFileSystem);
+
+  virtual void GetName(nsAString& aName, ErrorResult& aRv) const override;
+
+  virtual void GetFullPath(nsAString& aFullPath,
+                           ErrorResult& aRv) const override;
+
+  virtual already_AddRefed<FileSystemDirectoryReader> CreateReader() override;
+
+ private:
+  ~FileSystemRootDirectoryEntry();
+
+  virtual void GetInternal(
+      const nsAString& aPath, const FileSystemFlags& aFlag,
+      const Optional<OwningNonNull<FileSystemEntryCallback>>& aSuccessCallback,
+      const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+      GetInternalType aType) override;
+
+  void Error(const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+             nsresult aError) const;
+
+  Sequence<RefPtr<FileSystemEntry>> mEntries;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_FileSystemRootDirectoryEntry_h
diff --git a/dom/filesystem/compat/FileSystemRootDirectoryReader.cpp b/dom/filesystem/compat/FileSystemRootDirectoryReader.cpp
new file mode 100644
index 0000000000..5d30f0c1cb
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemRootDirectoryReader.cpp
@@ -0,0 +1,93 @@
+/* -*- 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 "FileSystemRootDirectoryReader.h"
+#include "CallbackRunnables.h"
+#include "nsIGlobalObject.h"
+#include "mozilla/dom/FileSystemDirectoryReaderBinding.h"
+#include "mozilla/dom/FileSystemUtils.h"
+
+namespace mozilla::dom {
+
+namespace {
+
+class EntriesCallbackRunnable final : public Runnable {
+ public:
+  EntriesCallbackRunnable(FileSystemEntriesCallback* aCallback,
+                          const Sequence<RefPtr<FileSystemEntry>>& aEntries)
+      : Runnable("EntriesCallbackRunnable"),
+        mCallback(aCallback),
+        mEntries(aEntries) {
+    MOZ_ASSERT(aCallback);
+  }
+
+  // MOZ_CAN_RUN_SCRIPT_BOUNDARY until Runnable::Run is MOZ_CAN_RUN_SCRIPT.  See
+  // bug 1535398.
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD Run() override {
+    Sequence<OwningNonNull<FileSystemEntry>> entries;
+    for (uint32_t i = 0; i < mEntries.Length(); ++i) {
+      if (!entries.AppendElement(mEntries[i].forget(), fallible)) {
+        return NS_ERROR_OUT_OF_MEMORY;
+      }
+    }
+
+    mCallback->Call(entries);
+    return NS_OK;
+  }
+
+ private:
+  const RefPtr<FileSystemEntriesCallback> mCallback;
+  Sequence<RefPtr<FileSystemEntry>> mEntries;
+};
+
+}  // anonymous namespace
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(FileSystemRootDirectoryReader,
+                                   FileSystemDirectoryReader, mEntries)
+
+NS_IMPL_ADDREF_INHERITED(FileSystemRootDirectoryReader,
+                         FileSystemDirectoryReader)
+NS_IMPL_RELEASE_INHERITED(FileSystemRootDirectoryReader,
+                          FileSystemDirectoryReader)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FileSystemRootDirectoryReader)
+NS_INTERFACE_MAP_END_INHERITING(FileSystemDirectoryReader)
+
+FileSystemRootDirectoryReader::FileSystemRootDirectoryReader(
+    FileSystemDirectoryEntry* aParentEntry, FileSystem* aFileSystem,
+    const Sequence<RefPtr<FileSystemEntry>>& aEntries)
+    : FileSystemDirectoryReader(aParentEntry, aFileSystem, nullptr),
+      mEntries(aEntries),
+      mAlreadyRead(false) {
+  MOZ_ASSERT(aParentEntry);
+  MOZ_ASSERT(aFileSystem);
+}
+
+FileSystemRootDirectoryReader::~FileSystemRootDirectoryReader() = default;
+
+void FileSystemRootDirectoryReader::ReadEntries(
+    FileSystemEntriesCallback& aSuccessCallback,
+    const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+    ErrorResult& aRv) {
+  if (mAlreadyRead) {
+    RefPtr<EmptyEntriesCallbackRunnable> runnable =
+        new EmptyEntriesCallbackRunnable(&aSuccessCallback);
+
+    aRv =
+        FileSystemUtils::DispatchRunnable(GetParentObject(), runnable.forget());
+    return;
+  }
+
+  // This object can be used only once.
+  mAlreadyRead = true;
+
+  RefPtr<EntriesCallbackRunnable> runnable =
+      new EntriesCallbackRunnable(&aSuccessCallback, mEntries);
+
+  aRv = FileSystemUtils::DispatchRunnable(GetParentObject(), runnable.forget());
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/filesystem/compat/FileSystemRootDirectoryReader.h b/dom/filesystem/compat/FileSystemRootDirectoryReader.h
new file mode 100644
index 0000000000..7429de8a9c
--- /dev/null
+++ b/dom/filesystem/compat/FileSystemRootDirectoryReader.h
@@ -0,0 +1,38 @@
+/* -*- 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_FileSystemRootDirectoryReader_h
+#define mozilla_dom_FileSystemRootDirectoryReader_h
+
+#include "FileSystemDirectoryReader.h"
+
+namespace mozilla::dom {
+
+class FileSystemRootDirectoryReader final : public FileSystemDirectoryReader {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(FileSystemRootDirectoryReader,
+                                           FileSystemDirectoryReader)
+
+  explicit FileSystemRootDirectoryReader(
+      FileSystemDirectoryEntry* aParentEntry, FileSystem* aFileSystem,
+      const Sequence<RefPtr<FileSystemEntry>>& aEntries);
+
+  virtual void ReadEntries(
+      FileSystemEntriesCallback& aSuccessCallback,
+      const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
+      ErrorResult& aRv) override;
+
+ private:
+  ~FileSystemRootDirectoryReader();
+
+  Sequence<RefPtr<FileSystemEntry>> mEntries;
+  bool mAlreadyRead;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // mozilla_dom_FileSystemRootDirectoryReader_h
diff --git a/dom/filesystem/compat/moz.build b/dom/filesystem/compat/moz.build
new file mode 100644
index 0000000000..6757a73d9e
--- /dev/null
+++ b/dom/filesystem/compat/moz.build
@@ -0,0 +1,30 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+TEST_DIRS += ["tests"]
+
+EXPORTS.mozilla.dom += [
+    "FileSystem.h",
+    "FileSystemDirectoryEntry.h",
+    "FileSystemDirectoryReader.h",
+    "FileSystemEntry.h",
+    "FileSystemFileEntry.h",
+]
+
+UNIFIED_SOURCES += [
+    "CallbackRunnables.cpp",
+    "FileSystem.cpp",
+    "FileSystemDirectoryEntry.cpp",
+    "FileSystemDirectoryReader.cpp",
+    "FileSystemEntry.cpp",
+    "FileSystemFileEntry.cpp",
+    "FileSystemRootDirectoryEntry.cpp",
+    "FileSystemRootDirectoryReader.cpp",
+]
+
+FINAL_LIBRARY = "xul"
+
+include("/ipc/chromium/chromium-config.mozbuild")
diff --git a/dom/filesystem/compat/tests/mochitest.ini b/dom/filesystem/compat/tests/mochitest.ini
new file mode 100644
index 0000000000..2b6eafb550
--- /dev/null
+++ b/dom/filesystem/compat/tests/mochitest.ini
@@ -0,0 +1,8 @@
+[DEFAULT]
+support-files =
+  script_entries.js
+  !/dom/html/test/form_submit_server.sjs
+
+[test_basic.html]
+[test_no_dnd.html]
+[test_formSubmission.html]
diff --git a/dom/filesystem/compat/tests/moz.build b/dom/filesystem/compat/tests/moz.build
new file mode 100644
index 0000000000..7c990fbc62
--- /dev/null
+++ b/dom/filesystem/compat/tests/moz.build
@@ -0,0 +1,7 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+MOCHITEST_MANIFESTS += ["mochitest.ini"]
diff --git a/dom/filesystem/compat/tests/script_entries.js b/dom/filesystem/compat/tests/script_entries.js
new file mode 100644
index 0000000000..7f52fe6bf2
--- /dev/null
+++ b/dom/filesystem/compat/tests/script_entries.js
@@ -0,0 +1,47 @@
+/* eslint-env mozilla/chrome-script */
+// eslint-disable-next-line mozilla/reject-importGlobalProperties
+Cu.importGlobalProperties(["File", "Directory"]);
+var tmpFile, tmpDir;
+
+addMessageListener("entries.open", function (e) {
+  tmpFile = Services.dirsvc
+    .QueryInterface(Ci.nsIProperties)
+    .get("TmpD", Ci.nsIFile);
+  tmpFile.append("file.txt");
+  tmpFile.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);
+
+  tmpDir = Services.dirsvc
+    .QueryInterface(Ci.nsIProperties)
+    .get("TmpD", Ci.nsIFile);
+
+  tmpDir.append("dir-test");
+  tmpDir.createUnique(Ci.nsIFile.DIRECTORY_TYPE, 0o700);
+
+  var file1 = tmpDir.clone();
+  file1.append("foo.txt");
+  file1.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);
+
+  var dir1 = tmpDir.clone();
+  dir1.append("subdir");
+  dir1.create(Ci.nsIFile.DIRECTORY_TYPE, 0o700);
+
+  var file2 = dir1.clone();
+  file2.append("bar..txt"); // Note the double ..
+  file2.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);
+
+  var dir2 = dir1.clone();
+  dir2.append("subsubdir");
+  dir2.create(Ci.nsIFile.DIRECTORY_TYPE, 0o700);
+
+  File.createFromNsIFile(tmpFile).then(function (file) {
+    sendAsyncMessage("entries.opened", {
+      data: [new Directory(tmpDir.path), file],
+    });
+  });
+});
+
+addMessageListener("entries.delete", function (e) {
+  tmpFile.remove(true);
+  tmpDir.remove(true);
+  sendAsyncMessage("entries.deleted");
+});
diff --git a/dom/filesystem/compat/tests/test_basic.html b/dom/filesystem/compat/tests/test_basic.html
new file mode 100644
index 0000000000..4ad0c37d67
--- /dev/null
+++ b/dom/filesystem/compat/tests/test_basic.html
@@ -0,0 +1,549 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Blink FileSystem API - subset</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+
+<body>
+<input id="entries" type="file"></input>
+<script type="application/javascript">
+var fileEntry;
+var directoryEntry;
+var script;
+
+function setup_tests() {
+  SpecialPowers.pushPrefEnv({"set": [["dom.webkitBlink.dirPicker.enabled", true],
+                                     ["dom.filesystem.pathcheck.disabled", true],
+                                     ["dom.webkitBlink.filesystem.enabled", true]]}, next);
+}
+
+function populate_entries() {
+  var url = SimpleTest.getTestFileURL("script_entries.js");
+  script = SpecialPowers.loadChromeScript(url);
+
+  function onOpened(message) {
+    var entries = document.getElementById("entries");
+    SpecialPowers.wrap(entries).mozSetDndFilesAndDirectories(message.data);
+    next();
+  }
+
+  script.addMessageListener("entries.opened", onOpened);
+  script.sendAsyncMessage("entries.open");
+}
+
+function test_entries() {
+  var entries = document.getElementById("entries");
+  ok("webkitEntries" in entries, "HTMLInputElement.webkitEntries");
+  is(entries.webkitEntries.length, 2, "HTMLInputElement.webkitEntries.length == 2");
+  is(entries.files.length, 1, "HTMLInputElement.files is still populated");
+
+  for (var i = 0; i < entries.webkitEntries.length; ++i) {
+    if (entries.webkitEntries[i].isFile) {
+      ok(!fileEntry, "We just want 1 fileEntry");
+      fileEntry = entries.webkitEntries[i];
+    } else {
+      ok(entries.webkitEntries[i].isDirectory, "If not a file, we have a directory.");
+      ok(!directoryEntry, "We just want 1 directoryEntry");
+      directoryEntry = entries.webkitEntries[i];
+    }
+  }
+
+  next();
+}
+
+function test_fileEntry() {
+  ok("name" in fileEntry, "We have a name.");
+  ok("fullPath" in fileEntry, "We have a fullPath.");
+  ok("filesystem" in fileEntry, "We have a filesystem.");
+
+  next();
+}
+
+function test_fileEntry_file() {
+  fileEntry.file(function(file) {
+    ok(file, "We have a file here!");
+    is(file.name, fileEntry.name, "Same file name.");
+    next();
+  }, function() {
+    ok(false, "Something when wrong!");
+  });
+}
+
+function test_fileEntry_getParent() {
+  fileEntry.getParent(function(entry) {
+    is(fileEntry.fullPath, entry.fullPath, "Top level FileEntry should return itself as parent.");
+    next();
+  }, function() {
+    ok(false, "This is wrong.");
+  });
+}
+
+function test_directoryEntry() {
+  ok("name" in directoryEntry, "We have a name.");
+  ok("fullPath" in directoryEntry, "We have a fullPath.");
+  ok("filesystem" in directoryEntry, "We have a filesystem.");
+
+  next();
+}
+
+function test_directoryEntry_createReader() {
+  var reader = directoryEntry.createReader();
+  ok(reader, "We have a DirectoryReader");
+
+  reader.readEntries(function(a) {
+    ok(Array.isArray(a), "We want an array.");
+    is(a.length, 2, "reader.readyEntries returns 2 elements.");
+
+    for (var i = 0; i < 2; ++i) {
+      ok(a[i].name == "subdir" || a[i].name == "foo.txt", "Correct names");
+      is(a[i].fullPath, directoryEntry.fullPath + "/" + a[i].name, "FullPath is correct");
+    }
+
+    // Called twice:
+    reader.readEntries(function(a1) {
+      ok(Array.isArray(a1), "We want an array.");
+      is(a1.length, 0, "reader.readyEntries returns 0 elements.");
+      next();
+    }, function() {
+      ok(false, "Something when wrong!");
+    });
+  }, function() {
+    ok(false, "Something when wrong!");
+  });
+}
+
+function test_directoryEntry_getParent() {
+  directoryEntry.getParent(function(entry) {
+    is(directoryEntry.fullPath, entry.fullPath, "Top level FileEntry should return itself as parent.");
+    next();
+  }, function() {
+    ok(false, "This is wrong.");
+  });
+}
+
+function test_directoryEntry_getFile_securityError() {
+  directoryEntry.getFile("foo", { create: true },
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "SecurityError", "This must generate a SecurityError.");
+    next();
+  });
+}
+
+function test_directoryEntry_getFile_typeMismatchError() {
+  directoryEntry.getFile("subdir", {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "TypeMismatchError", "This must generate a TypeMismatchError.");
+    next();
+  });
+}
+
+function test_directoryEntry_getFile_nonValidPath() {
+  directoryEntry.getFile("../../", {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "NotFoundError", "This must generate a NotFoundError.");
+    next();
+  });
+}
+
+function test_directoryEntry_getFile_nonExistingPath() {
+  directoryEntry.getFile("foo_bar.txt", {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "NotFoundError", "This must generate a NotFoundError.");
+    next();
+  });
+}
+
+function test_directoryEntry_getFile_simple() {
+  directoryEntry.getFile("foo.txt", {},
+  function(e) {
+    is(e.name, "foo.txt", "We have the right FileEntry.");
+    test_getParent(e, directoryEntry, /* nested */ false);
+  }, function(e) {
+    ok(false, "This should not happen.");
+  });
+}
+
+function test_directoryEntry_getFile_deep() {
+  directoryEntry.getFile("subdir/bar..txt", {},
+  function(e) {
+    is(e.name, "bar..txt", "We have the right FileEntry.");
+    test_getParent(e, directoryEntry, /* nested */ true);
+  }, function(e) {
+    ok(false, "This should not happen.");
+  });
+}
+
+function test_directoryEntry_getDirectory_securityError() {
+  directoryEntry.getDirectory("foo", { create: true },
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "SecurityError", "This must generate a SecurityError.");
+    next();
+  });
+}
+
+function test_directoryEntry_getDirectory_typeMismatchError() {
+  directoryEntry.getDirectory("foo.txt", {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "TypeMismatchError", "This must generate a TypeMismatchError.");
+    next();
+  });
+}
+
+function test_directoryEntry_getDirectory_nonValidPath() {
+  directoryEntry.getDirectory("../../", {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "NotFoundError", "This must generate a NotFoundError.");
+    next();
+  });
+}
+
+function test_directoryEntry_getDirectory_nonExistingPath() {
+  directoryEntry.getDirectory("non_existing_dir", {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "NotFoundError", "This must generate a NotFoundError.");
+    next();
+  });
+}
+
+function test_directoryEntry_getDirectory_simple() {
+  directoryEntry.getDirectory("subdir", {},
+  function(e) {
+    is(e.name, "subdir", "We have the right DirectoryEntry.");
+    test_getParent(e, directoryEntry, /* nested */ false);
+  }, function(e) {
+    ok(false, "This should not happen.");
+  });
+}
+
+function test_directoryEntry_getDirectory_deep() {
+  directoryEntry.getDirectory("subdir/subsubdir", {},
+  function(e) {
+    is(e.name, "subsubdir", "We have the right DirectoryEntry.");
+    test_getParent(e, directoryEntry, /* nested */ true);
+  }, function(e) {
+    ok(false, "This should not happen.");
+  });
+}
+
+function test_filesystem() {
+  is(fileEntry.filesystem, directoryEntry.filesystem, "FileSystem object is shared.");
+
+  var fs = fileEntry.filesystem;
+  ok(fs.name, "FileSystem.name exists.");
+  ok(fs.root, "FileSystem has a root.");
+
+  is(fs.root.name, "", "FileSystem.root.name must be an empty string.");
+  is(fs.root.fullPath, "/", "FileSystem.root.fullPath must be '/'");
+
+  var reader = fs.root.createReader();
+  reader.readEntries(function(a) {
+    ok(Array.isArray(a), "We want an array.");
+    is(a.length, 2, "reader.readyEntries returns 2 elements.");
+    next();
+  }, function() {
+    ok(false, "Something when wrong!");
+  });
+}
+
+function test_root_getFile_securityError() {
+  fileEntry.filesystem.root.getFile("foo", { create: true },
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "SecurityError", "This must generate a SecurityError.");
+    next();
+  });
+}
+
+function test_root_getFile_typeMismatchError() {
+  fileEntry.filesystem.root.getFile(directoryEntry.name, {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "TypeMismatchError", "This must generate a TypeMismatchError.");
+    next();
+  });
+}
+
+function test_root_getFile_nonValidPath() {
+  fileEntry.filesystem.root.getFile("../../", {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "NotFoundError", "This must generate a NotFoundError.");
+    next();
+  });
+}
+
+function test_root_getFile_nonExistingPath() {
+  fileEntry.filesystem.root.getFile("existing.txt", {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "NotFoundError", "This must generate a NotFoundError.");
+    next();
+  });
+}
+
+function test_root_getFile_simple() {
+  fileEntry.filesystem.root.getFile(fileEntry.name, {},
+  function(e) {
+    is(e.name, fileEntry.name, "We have the right FileEntry.");
+    next();
+  }, function(e) {
+    ok(false, "This should not happen.");
+  });
+}
+
+function test_root_getFile_deep() {
+  fileEntry.filesystem.root.getFile(directoryEntry.name + "/subdir/bar..txt", {},
+  function(e) {
+    is(e.name, "bar..txt", "We have the right FileEntry.");
+    next();
+  }, function(e) {
+    ok(false, "This should not happen.");
+  });
+}
+
+function test_root_getDirectory_securityError() {
+  fileEntry.filesystem.root.getDirectory("foo", { create: true },
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "SecurityError", "This must generate a SecurityError.");
+    next();
+  });
+}
+
+function test_root_getDirectory_typeMismatchError() {
+  fileEntry.filesystem.root.getDirectory(fileEntry.name, {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "TypeMismatchError", "This must generate a TypeMismatchError.");
+    next();
+  });
+}
+
+function test_root_getDirectory_nonValidPath() {
+  fileEntry.filesystem.root.getDirectory("../../", {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "NotFoundError", "This must generate a NotFoundError.");
+    next();
+  });
+}
+
+function test_root_getDirectory_nonExistingPath() {
+  fileEntry.filesystem.root.getDirectory("404", {},
+  function() {
+    ok(false, "This should not happen.");
+  }, function(e) {
+    is(e.name, "NotFoundError", "This must generate a NotFoundError.");
+    next();
+  });
+}
+
+function test_root_getDirectory_simple() {
+  fileEntry.filesystem.root.getDirectory(directoryEntry.name, {},
+  function(e) {
+    is(e.name, directoryEntry.name, "We have the right DirectoryEntry.");
+    next();
+  }, function(e) {
+    ok(false, "This should not happen.");
+  });
+}
+
+function test_root_getDirectory_deep() {
+  fileEntry.filesystem.root.getDirectory(directoryEntry.name + "/subdir/subsubdir", {},
+  function(e) {
+    is(e.name, "subsubdir", "We have the right DirectoryEntry.");
+    next();
+  }, function(e) {
+    ok(false, "This should not happen.");
+  });
+}
+
+function cleanUpTestingFiles() {
+  script.addMessageListener("entries.deleted", function onDeleted() {
+    script.removeMessageListener("entries.deleted");
+    script.destroy();
+    next();
+  });
+
+  script.sendAsyncMessage("entries.delete");
+}
+
+function test_getParent(entry, parentEntry, nested) {
+  entry.getParent(function(e) {
+    ok(e, "We have a parent Entry.");
+    if (!nested) {
+      is(e, parentEntry, "Parent entry matches");
+      next();
+    } else {
+      test_getParent(e, parentEntry, false);
+    }
+  }, function(e) {
+    ok(false, "This should not happen.");
+  });
+}
+
+function test_webkitRelativePath() {
+  fileEntry.file(function(file1) {
+    ok(file1, "We have a file here!");
+    ok(!file1.webkitRelativePath, "webkitRelativePath is an empty string");
+
+    fileEntry.file(function(file2) {
+      ok(file2, "We have a file here!");
+      ok(!file2.webkitRelativePath, "webkitRelativePath is an empty string");
+      isnot(file1, file2, "The 2 files are not the same");
+
+      next();
+    }, function() {
+      ok(false, "Something when wrong!");
+    });
+  }, function() {
+    ok(false, "Something when wrong!");
+  });
+}
+
+function test_deprecatedCallbacks() {
+  try {
+    fileEntry.file({ handleEvent: _ => { ok(false, "This function should not be called!"); }});
+    ok(false, "fileEntry.file() should throw with wrong arguments");
+  } catch (e) {
+    ok(true, "fileEntry.file() should throw with wrong arguments");
+    is(e.name, "TypeError", "Correct exception");
+  }
+
+  try {
+    fileEntry.getParent({ handleEvent: _ => { ok(false, "This function should not be called!"); }});
+    ok(false, "fileEntry.getParent() should throw with wrong arguments");
+  } catch (e) {
+    ok(true, "fileEntry.getParent() should throw with wrong arguments");
+    is(e.name, "TypeError", "Correct exception");
+  }
+
+  try {
+    directoryEntry.getFile("file.txt", {}, { handleEvent: _ => { ok(false, "This function should not be called!"); }});
+    ok(false, "directoryEntry.getFile() should throw with wrong arguments");
+  } catch (e) {
+    ok(true, "directoryEntry.getFile() should throw with wrong arguments");
+    is(e.name, "TypeError", "Correct exception");
+  }
+
+  try {
+    directoryEntry.getDirectory("foo", { create: true }, { handleEvent: _ => { ok(false, "This function should not be called!"); }});
+    ok(false, "directoryEntry.getDirectory() should throw with wrong arguments");
+  } catch (e) {
+    ok(true, "directoryEntry.getDirectory() should throw with wrong arguments");
+    is(e.name, "TypeError", "Correct exception");
+  }
+
+  try {
+    directoryEntry.getParent({ handleEvent: _ => { ok(false, "This function should not be called!"); }});
+    ok(false, "directoryEntry.getParent() should throw with wrong arguments");
+  } catch (e) {
+    ok(true, "directoryEntry.getParent() should throw with wrong arguments");
+    is(e.name, "TypeError", "Correct exception");
+  }
+
+  let reader = directoryEntry.createReader();
+  ok(reader, "We have a DirectoryReader");
+
+  try {
+    reader.readEntries({ handleEvent: _ => { ok(false, "This function should not be called!"); }});
+    ok(false, "reader.readEntries() should throw with wrong arguments");
+  } catch (e) {
+    ok(true, "reader.readEntries() should throw with wrong arguments");
+    is(e.name, "TypeError", "Correct exception");
+  }
+
+  next();
+}
+
+var tests = [
+  setup_tests,
+  populate_entries,
+
+  test_entries,
+
+  test_fileEntry,
+  test_fileEntry_file,
+  test_fileEntry_getParent,
+
+  test_directoryEntry,
+  test_directoryEntry_createReader,
+  test_directoryEntry_getParent,
+
+  test_directoryEntry_getFile_securityError,
+  test_directoryEntry_getFile_typeMismatchError,
+  test_directoryEntry_getFile_nonValidPath,
+  test_directoryEntry_getFile_nonExistingPath,
+  test_directoryEntry_getFile_simple,
+  test_directoryEntry_getFile_deep,
+
+  test_directoryEntry_getDirectory_securityError,
+  test_directoryEntry_getDirectory_typeMismatchError,
+  test_directoryEntry_getDirectory_nonValidPath,
+  test_directoryEntry_getDirectory_nonExistingPath,
+  test_directoryEntry_getDirectory_simple,
+  test_directoryEntry_getDirectory_deep,
+
+  test_filesystem,
+
+  test_root_getFile_securityError,
+  test_root_getFile_typeMismatchError,
+  test_root_getFile_nonValidPath,
+  test_root_getFile_nonExistingPath,
+  test_root_getFile_simple,
+  test_root_getFile_deep,
+
+  test_root_getDirectory_securityError,
+  test_root_getDirectory_typeMismatchError,
+  test_root_getDirectory_nonValidPath,
+  test_root_getDirectory_nonExistingPath,
+  test_root_getDirectory_simple,
+  test_root_getDirectory_deep,
+
+  test_webkitRelativePath,
+
+  test_deprecatedCallbacks,
+
+  cleanUpTestingFiles,
+];
+
+function next() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+
+  var test = tests.shift();
+  test();
+}
+
+SimpleTest.waitForExplicitFinish();
+next();
+</script>
+</body>
+</html>
diff --git a/dom/filesystem/compat/tests/test_formSubmission.html b/dom/filesystem/compat/tests/test_formSubmission.html
new file mode 100644
index 0000000000..2447e7a071
--- /dev/null
+++ b/dom/filesystem/compat/tests/test_formSubmission.html
@@ -0,0 +1,271 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Directory form submission</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
+</head>
+<body onload="return next();">
+
+<iframe name="target_iframe" id="target_iframe"></iframe>
+
+<form action="../../../html/test/form_submit_server.sjs" target="target_iframe" id="form"
+      method="POST" enctype="multipart/form-data">
+</form>
+
+<script class="testbody" type="text/javascript">
+var form;
+var iframe;
+var input;
+var script;
+var xhr;
+
+function setup_tests() {
+  form = document.getElementById("form");
+
+  iframe = document.getElementById("target_iframe");
+  iframe.onload = function() {
+    info("Frame loaded!");
+    next();
+  };
+
+  SpecialPowers.pushPrefEnv({"set": [["dom.webkitBlink.dirPicker.enabled", true],
+                                     ["dom.filesystem.pathcheck.disabled", true],
+                                     ["dom.webkitBlink.filesystem.enabled", true]]}, next);
+}
+
+function populate_entries(webkitDirectory) {
+  var url = SimpleTest.getTestFileURL("script_entries.js");
+  script = SpecialPowers.loadChromeScript(url);
+
+  if (input) {
+    form.removeChild(input);
+  }
+
+  input = document.createElement("input");
+  input.setAttribute("id", "input");
+  input.setAttribute("type", "file");
+  input.setAttribute("name", "input");
+
+  if (webkitDirectory) {
+    input.setAttribute("webkitdirectory", "true");
+  }
+
+  form.appendChild(input);
+
+  function onOpened(message) {
+    input.addEventListener("change", function() {
+      next();
+    }, {once: true});
+
+    SpecialPowers.wrap(input).mozSetDndFilesAndDirectories([message.data[0]]);
+  }
+
+  script.addMessageListener("entries.opened", onOpened);
+  script.sendAsyncMessage("entries.open");
+}
+
+function delete_entries() {
+  script.sendAsyncMessage("entries.delete");
+  script.addMessageListener("entries.deleted", function() {
+    script.destroy();
+    next();
+  });
+}
+
+function setup_plain() {
+  info("Preparing for a plain text submission...");
+  form.action = "../../../html/test/form_submit_server.sjs?plain";
+  form.method = "POST";
+  form.enctype = "text/plain";
+  form.submit();
+}
+
+function test_plain() {
+  var content = iframe.contentDocument.documentElement.textContent;
+  var submission = JSON.parse(content);
+  info(submission);
+  is(submission, input.webkitEntries.map(function(v) {
+     return "input=" + v.name + "\r\n";
+  }).join(""), "Data match");
+
+  next();
+}
+
+function setup_urlencoded() {
+  info("Preparing for a urlencoded submission...");
+  form.action = "../../../html/test/form_submit_server.sjs?url";
+  form.method = "POST";
+  form.enctype = "application/x-www-form-urlencoded";
+  form.submit();
+}
+
+function setup_urlencoded_get() {
+  info("Preparing for a urlencoded+GET submission...");
+  form.action = "../../../html/test/form_submit_server.sjs?xxyy";
+  form.method = "GET";
+  form.enctype = "";
+  form.submit();
+}
+
+function setup_urlencoded_empty() {
+  info("Preparing for a urlencoded+default values submission...");
+  form.action = "../../../html/test/form_submit_server.sjs";
+  form.method = "";
+  form.enctype = "";
+  form.submit();
+}
+
+function test_urlencoded() {
+  var content = iframe.contentDocument.documentElement.textContent;
+  var submission = JSON.parse(content);
+  info(submission);
+  is(submission, input.webkitEntries.map(function(v) {
+     return "input=" + v.name;
+  }).join("&"), "Data match");
+
+  next();
+}
+
+function setup_formData() {
+  info("Preparing for a fromData submission...");
+
+  xhr = new XMLHttpRequest();
+  xhr.onload = next;
+  xhr.open("POST", "../../../html/test/form_submit_server.sjs");
+  xhr.send(new FormData(form));
+}
+
+function test_multipart() {
+  var submission = JSON.parse(xhr.responseText);
+
+  var array = input.webkitEntries;
+  is(submission.length, array.length, "Same length");
+  info(submission);
+
+  for (var i = 0; i < array.length; ++i) {
+    if (array[i].isDirectory) {
+      is(submission[i].headers["Content-Disposition"],
+         "form-data; name=\"input\"; filename=\"/" + array[i].name + "\"",
+         "Correct Content-Disposition");
+      is(submission[i].headers["Content-Type"], "application/octet-stream",
+         "Correct Content-Type");
+      is(submission[i].body, "", "Correct body");
+    } else {
+      ok(array[i].isFile);
+      is(submission[i].headers["Content-Disposition"],
+         "form-data; name=\"input\"; filename=\"" + array[i].name + "\"",
+         "Correct Content-Disposition");
+      is(submission[i].headers["Content-Type"], array[i].type,
+         "Correct Content-Type");
+      is(submission[i].body, "", "Correct body");
+    }
+  }
+
+  next();
+}
+
+function getInputFiles(inputElement) {
+  var array = [];
+  for (var i = 0; i < inputElement.files.length; ++i) {
+    array.push(inputElement.files[i]);
+  }
+  return array;
+}
+
+function test_webkit_plain() {
+  var content = iframe.contentDocument.documentElement.textContent;
+  var submission = JSON.parse(content);
+
+  is(submission, getInputFiles(input).map(function(v) {
+    return "input=" + v.name + "\r\n";
+  }).join(""), "Data match");
+
+  next();
+}
+
+function test_webkit_urlencoded() {
+  var content = iframe.contentDocument.documentElement.textContent;
+  var submission = JSON.parse(content);
+  is(submission, getInputFiles(input).map(function(v) {
+     return "input=" + v.name;
+  }).join("&"), "Data match");
+
+  next();
+}
+
+function test_webkit_multipart() {
+  var submission = JSON.parse(xhr.responseText);
+  var array = getInputFiles(input);
+  is(submission.length, array.length, "Same length");
+
+  for (var i = 0; i < array.length; ++i) {
+    ok(array[i] instanceof File);
+    is(submission[i].headers["Content-Disposition"],
+       "form-data; name=\"input\"; filename=\"" + array[i].webkitRelativePath + "\"",
+       "Correct Content-Disposition");
+    is(submission[i].headers["Content-Type"], array[i].type,
+       "Correct Content-Type");
+    is(submission[i].body, "", "Correct body");
+  }
+  next();
+}
+
+var tests = [
+  setup_tests,
+
+  function() { populate_entries(false); },
+
+  setup_plain,
+  test_plain,
+
+  setup_urlencoded,
+  test_urlencoded,
+
+  setup_urlencoded_get,
+  test_urlencoded,
+
+  setup_urlencoded_empty,
+  test_urlencoded,
+
+  setup_formData,
+  test_multipart,
+
+  delete_entries,
+
+  function() { populate_entries(true); },
+
+  setup_plain,
+  test_webkit_plain,
+
+  setup_urlencoded,
+  test_webkit_urlencoded,
+
+  setup_urlencoded_get,
+  test_webkit_urlencoded,
+
+  setup_urlencoded_empty,
+  test_webkit_urlencoded,
+
+  setup_formData,
+  test_webkit_multipart,
+
+  delete_entries,
+];
+
+function next() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+
+  var test = tests.shift();
+  test();
+}
+
+SimpleTest.waitForExplicitFinish();
+
+</script>
+</body>
+</html>
diff --git a/dom/filesystem/compat/tests/test_no_dnd.html b/dom/filesystem/compat/tests/test_no_dnd.html
new file mode 100644
index 0000000000..c49dd5d40f
--- /dev/null
+++ b/dom/filesystem/compat/tests/test_no_dnd.html
@@ -0,0 +1,84 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Blink FileSystem API - no DND == no webkitEntries</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+
+<body>
+<script type="application/javascript">
+var fileEntry;
+var directoryEntry;
+var script;
+var entries;
+
+function setup_tests() {
+  SpecialPowers.pushPrefEnv({"set": [["dom.webkitBlink.dirPicker.enabled", true],
+                                     ["dom.filesystem.pathcheck.disabled", true],
+                                     ["dom.webkitBlink.filesystem.enabled", true]]}, next);
+}
+
+function populate_entries() {
+  entries = document.createElement("input");
+  entries.setAttribute("type", "file");
+  document.body.appendChild(entries);
+
+  var url = SimpleTest.getTestFileURL("script_entries.js");
+  script = SpecialPowers.loadChromeScript(url);
+
+  function onOpened(message) {
+    for (var i = 0 ; i < message.data.length; ++i) {
+      if (message.data[i] instanceof File) {
+        SpecialPowers.wrap(entries).mozSetFileArray([message.data[i]]);
+        next();
+      }
+    }
+  }
+
+  script.addMessageListener("entries.opened", onOpened);
+  script.sendAsyncMessage("entries.open");
+}
+
+function test_entries() {
+  ok("webkitEntries" in entries, "HTMLInputElement.webkitEntries");
+  is(entries.webkitEntries.length, 0, "HTMLInputElement.webkitEntries.length == 0");
+  is(entries.files.length, 1, "HTMLInputElement.files is still populated");
+
+  next();
+}
+
+function cleanUpTestingFiles() {
+  script.addMessageListener("entries.deleted", function onDeleted() {
+    script.removeMessageListener("entries.deleted");
+    script.destroy();
+    next();
+  });
+
+  script.sendAsyncMessage("entries.delete");
+}
+
+var tests = [
+  setup_tests,
+  populate_entries,
+
+  test_entries,
+
+  cleanUpTestingFiles,
+];
+
+function next() {
+  if (!tests.length) {
+    SimpleTest.finish();
+    return;
+  }
+
+  var test = tests.shift();
+  test();
+}
+
+SimpleTest.waitForExplicitFinish();
+next();
+</script>
+</body>
+</html>