Add m-esr52 at 52.6.0

35 files changed, 2394 insertions, 0 deletions

diff --git a/dom/broadcastchannel/BroadcastChannel.cpp b/dom/broadcastchannel/BroadcastChannel.cpp
new file mode 100644
index 0000000000..c3c2d448b1
--- /dev/null
+++ b/dom/broadcastchannel/BroadcastChannel.cpp
@@ -0,0 +1,685 @@
+/* -*- 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 "BroadcastChannel.h"
+#include "BroadcastChannelChild.h"
+#include "mozilla/dom/BroadcastChannelBinding.h"
+#include "mozilla/dom/Navigator.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/StructuredCloneHolder.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "mozilla/ipc/BackgroundUtils.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "nsContentUtils.h"
+#include "WorkerPrivate.h"
+#include "WorkerRunnable.h"
+
+#include "nsIBFCacheEntry.h"
+#include "nsIDocument.h"
+#include "nsISupportsPrimitives.h"
+
+#ifdef XP_WIN
+#undef PostMessage
+#endif
+
+namespace mozilla {
+
+using namespace ipc;
+
+namespace dom {
+
+using namespace workers;
+
+class BroadcastChannelMessage final : public StructuredCloneHolder
+{
+public:
+  NS_INLINE_DECL_REFCOUNTING(BroadcastChannelMessage)
+
+  BroadcastChannelMessage()
+    : StructuredCloneHolder(CloningSupported, TransferringNotSupported,
+                            StructuredCloneScope::DifferentProcess)
+  {}
+
+private:
+  ~BroadcastChannelMessage()
+  {}
+};
+
+namespace {
+
+nsIPrincipal*
+GetPrincipalFromWorkerPrivate(WorkerPrivate* aWorkerPrivate)
+{
+  nsIPrincipal* principal = aWorkerPrivate->GetPrincipal();
+  if (principal) {
+    return principal;
+  }
+
+  // Walk up to our containing page
+  WorkerPrivate* wp = aWorkerPrivate;
+  while (wp->GetParent()) {
+    wp = wp->GetParent();
+  }
+
+  return wp->GetPrincipal();
+}
+
+class InitializeRunnable final : public WorkerMainThreadRunnable
+{
+public:
+  InitializeRunnable(WorkerPrivate* aWorkerPrivate, nsACString& aOrigin,
+                     PrincipalInfo& aPrincipalInfo, ErrorResult& aRv)
+    : WorkerMainThreadRunnable(aWorkerPrivate,
+                               NS_LITERAL_CSTRING("BroadcastChannel :: Initialize"))
+    , mWorkerPrivate(GetCurrentThreadWorkerPrivate())
+    , mOrigin(aOrigin)
+    , mPrincipalInfo(aPrincipalInfo)
+    , mRv(aRv)
+  {
+    MOZ_ASSERT(mWorkerPrivate);
+  }
+
+  bool MainThreadRun() override
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+
+    nsIPrincipal* principal = GetPrincipalFromWorkerPrivate(mWorkerPrivate);
+    if (!principal) {
+      mRv.Throw(NS_ERROR_FAILURE);
+      return true;
+    }
+
+    if (NS_WARN_IF(principal->GetIsNullPrincipal())) {
+      mRv.Throw(NS_ERROR_FAILURE);
+      return true;
+    }
+
+    mRv = PrincipalToPrincipalInfo(principal, &mPrincipalInfo);
+    if (NS_WARN_IF(mRv.Failed())) {
+      return true;
+    }
+
+    mRv = principal->GetOrigin(mOrigin);
+    if (NS_WARN_IF(mRv.Failed())) {
+      return true;
+    }
+
+    // Walk up to our containing page
+    WorkerPrivate* wp = mWorkerPrivate;
+    while (wp->GetParent()) {
+      wp = wp->GetParent();
+    }
+
+    // Window doesn't exist for some kind of workers (eg: SharedWorkers)
+    nsPIDOMWindowInner* window = wp->GetWindow();
+    if (!window) {
+      return true;
+    }
+
+    return true;
+  }
+
+private:
+  WorkerPrivate* mWorkerPrivate;
+  nsACString& mOrigin;
+  PrincipalInfo& mPrincipalInfo;
+  ErrorResult& mRv;
+};
+
+class BCPostMessageRunnable final : public nsIRunnable,
+                                    public nsICancelableRunnable
+{
+public:
+  NS_DECL_ISUPPORTS
+
+  BCPostMessageRunnable(BroadcastChannelChild* aActor,
+                        BroadcastChannelMessage* aData)
+    : mActor(aActor)
+    , mData(aData)
+  {
+    MOZ_ASSERT(mActor);
+  }
+
+  NS_IMETHOD Run() override
+  {
+    MOZ_ASSERT(mActor);
+    if (mActor->IsActorDestroyed()) {
+      return NS_OK;
+    }
+
+    ClonedMessageData message;
+
+    bool success;
+    SerializedStructuredCloneBuffer& buffer = message.data();
+    auto iter = mData->BufferData().Iter();
+    buffer.data = mData->BufferData().Borrow<js::SystemAllocPolicy>(iter, mData->BufferData().Size(), &success);
+    if (NS_WARN_IF(!success)) {
+      return NS_OK;
+    }
+
+    PBackgroundChild* backgroundManager = mActor->Manager();
+    MOZ_ASSERT(backgroundManager);
+
+    const nsTArray<RefPtr<BlobImpl>>& blobImpls = mData->BlobImpls();
+
+    if (!blobImpls.IsEmpty()) {
+      message.blobsChild().SetCapacity(blobImpls.Length());
+
+      for (uint32_t i = 0, len = blobImpls.Length(); i < len; ++i) {
+        PBlobChild* blobChild =
+          BackgroundChild::GetOrCreateActorForBlobImpl(backgroundManager,
+                                                       blobImpls[i]);
+        MOZ_ASSERT(blobChild);
+
+        message.blobsChild().AppendElement(blobChild);
+      }
+    }
+
+    mActor->SendPostMessage(message);
+    return NS_OK;
+  }
+
+  nsresult Cancel() override
+  {
+    mActor = nullptr;
+    return NS_OK;
+  }
+
+private:
+  ~BCPostMessageRunnable() {}
+
+  RefPtr<BroadcastChannelChild> mActor;
+  RefPtr<BroadcastChannelMessage> mData;
+};
+
+NS_IMPL_ISUPPORTS(BCPostMessageRunnable, nsICancelableRunnable, nsIRunnable)
+
+class CloseRunnable final : public nsIRunnable,
+                            public nsICancelableRunnable
+{
+public:
+  NS_DECL_ISUPPORTS
+
+  explicit CloseRunnable(BroadcastChannel* aBC)
+    : mBC(aBC)
+  {
+    MOZ_ASSERT(mBC);
+  }
+
+  NS_IMETHOD Run() override
+  {
+    mBC->Shutdown();
+    return NS_OK;
+  }
+
+  nsresult Cancel() override
+  {
+    mBC = nullptr;
+    return NS_OK;
+  }
+
+private:
+  ~CloseRunnable() {}
+
+  RefPtr<BroadcastChannel> mBC;
+};
+
+NS_IMPL_ISUPPORTS(CloseRunnable, nsICancelableRunnable, nsIRunnable)
+
+class TeardownRunnable final : public nsIRunnable,
+                               public nsICancelableRunnable
+{
+public:
+  NS_DECL_ISUPPORTS
+
+  explicit TeardownRunnable(BroadcastChannelChild* aActor)
+    : mActor(aActor)
+  {
+    MOZ_ASSERT(mActor);
+  }
+
+  NS_IMETHOD Run() override
+  {
+    MOZ_ASSERT(mActor);
+    if (!mActor->IsActorDestroyed()) {
+      mActor->SendClose();
+    }
+    return NS_OK;
+  }
+
+  nsresult Cancel() override
+  {
+    mActor = nullptr;
+    return NS_OK;
+  }
+
+private:
+  ~TeardownRunnable() {}
+
+  RefPtr<BroadcastChannelChild> mActor;
+};
+
+NS_IMPL_ISUPPORTS(TeardownRunnable, nsICancelableRunnable, nsIRunnable)
+
+class BroadcastChannelWorkerHolder final : public workers::WorkerHolder
+{
+  BroadcastChannel* mChannel;
+
+public:
+  explicit BroadcastChannelWorkerHolder(BroadcastChannel* aChannel)
+    : mChannel(aChannel)
+  {
+    MOZ_COUNT_CTOR(BroadcastChannelWorkerHolder);
+  }
+
+  virtual bool Notify(workers::Status aStatus) override
+  {
+    if (aStatus >= Closing) {
+      mChannel->Shutdown();
+    }
+
+    return true;
+  }
+
+private:
+  ~BroadcastChannelWorkerHolder()
+  {
+    MOZ_COUNT_DTOR(BroadcastChannelWorkerHolder);
+  }
+};
+
+} // namespace
+
+BroadcastChannel::BroadcastChannel(nsPIDOMWindowInner* aWindow,
+                                   const PrincipalInfo& aPrincipalInfo,
+                                   const nsACString& aOrigin,
+                                   const nsAString& aChannel)
+  : DOMEventTargetHelper(aWindow)
+  , mWorkerHolder(nullptr)
+  , mPrincipalInfo(new PrincipalInfo(aPrincipalInfo))
+  , mOrigin(aOrigin)
+  , mChannel(aChannel)
+  , mIsKeptAlive(false)
+  , mInnerID(0)
+  , mState(StateActive)
+{
+  // Window can be null in workers
+}
+
+BroadcastChannel::~BroadcastChannel()
+{
+  Shutdown();
+  MOZ_ASSERT(!mWorkerHolder);
+}
+
+JSObject*
+BroadcastChannel::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return BroadcastChannelBinding::Wrap(aCx, this, aGivenProto);
+}
+
+/* static */ already_AddRefed<BroadcastChannel>
+BroadcastChannel::Constructor(const GlobalObject& aGlobal,
+                              const nsAString& aChannel,
+                              ErrorResult& aRv)
+{
+  nsCOMPtr<nsPIDOMWindowInner> window =
+    do_QueryInterface(aGlobal.GetAsSupports());
+  // Window is null in workers.
+
+  nsAutoCString origin;
+  PrincipalInfo principalInfo;
+  WorkerPrivate* workerPrivate = nullptr;
+
+  if (NS_IsMainThread()) {
+    nsCOMPtr<nsIGlobalObject> incumbent = mozilla::dom::GetIncumbentGlobal();
+
+    if (!incumbent) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return nullptr;
+    }
+
+    nsIPrincipal* principal = incumbent->PrincipalOrNull();
+    if (!principal) {
+      aRv.Throw(NS_ERROR_UNEXPECTED);
+      return nullptr;
+    }
+
+    if (NS_WARN_IF(principal->GetIsNullPrincipal())) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return nullptr;
+    }
+
+    aRv = principal->GetOrigin(origin);
+    if (NS_WARN_IF(aRv.Failed())) {
+      return nullptr;
+    }
+
+    aRv = PrincipalToPrincipalInfo(principal, &principalInfo);
+    if (NS_WARN_IF(aRv.Failed())) {
+      return nullptr;
+    }
+  } else {
+    JSContext* cx = aGlobal.Context();
+    workerPrivate = GetWorkerPrivateFromContext(cx);
+    MOZ_ASSERT(workerPrivate);
+
+    RefPtr<InitializeRunnable> runnable =
+      new InitializeRunnable(workerPrivate, origin, principalInfo, aRv);
+    runnable->Dispatch(aRv);
+  }
+
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  RefPtr<BroadcastChannel> bc =
+    new BroadcastChannel(window, principalInfo, origin, aChannel);
+
+  // Register this component to PBackground.
+  PBackgroundChild* actor = BackgroundChild::GetForCurrentThread();
+  if (actor) {
+    bc->ActorCreated(actor);
+  } else {
+    BackgroundChild::GetOrCreateForCurrentThread(bc);
+  }
+
+  if (!workerPrivate) {
+    MOZ_ASSERT(window);
+    MOZ_ASSERT(window->IsInnerWindow());
+    bc->mInnerID = window->WindowID();
+
+    // Register as observer for inner-window-destroyed.
+    nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+    if (obs) {
+      obs->AddObserver(bc, "inner-window-destroyed", false);
+    }
+  } else {
+    bc->mWorkerHolder = new BroadcastChannelWorkerHolder(bc);
+    if (NS_WARN_IF(!bc->mWorkerHolder->HoldWorker(workerPrivate, Closing))) {
+      bc->mWorkerHolder = nullptr;
+      aRv.Throw(NS_ERROR_FAILURE);
+      return nullptr;
+    }
+  }
+
+  return bc.forget();
+}
+
+void
+BroadcastChannel::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+                              ErrorResult& aRv)
+{
+  if (mState != StateActive) {
+    aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return;
+  }
+
+  PostMessageInternal(aCx, aMessage, aRv);
+}
+
+void
+BroadcastChannel::PostMessageInternal(JSContext* aCx,
+                                      JS::Handle<JS::Value> aMessage,
+                                      ErrorResult& aRv)
+{
+  RefPtr<BroadcastChannelMessage> data = new BroadcastChannelMessage();
+
+  data->Write(aCx, aMessage, aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  PostMessageData(data);
+}
+
+void
+BroadcastChannel::PostMessageData(BroadcastChannelMessage* aData)
+{
+  RemoveDocFromBFCache();
+
+  if (mActor) {
+    RefPtr<BCPostMessageRunnable> runnable =
+      new BCPostMessageRunnable(mActor, aData);
+
+    if (NS_FAILED(NS_DispatchToCurrentThread(runnable))) {
+      NS_WARNING("Failed to dispatch to the current thread!");
+    }
+
+    return;
+  }
+
+  mPendingMessages.AppendElement(aData);
+}
+
+void
+BroadcastChannel::Close()
+{
+  if (mState != StateActive) {
+    return;
+  }
+
+  if (mPendingMessages.IsEmpty()) {
+    // We cannot call Shutdown() immediatelly because we could have some
+    // postMessage runnable already dispatched. Instead, we change the state to
+    // StateClosed and we shutdown the actor asynchrounsly.
+
+    mState = StateClosed;
+    RefPtr<CloseRunnable> runnable = new CloseRunnable(this);
+
+    if (NS_FAILED(NS_DispatchToCurrentThread(runnable))) {
+      NS_WARNING("Failed to dispatch to the current thread!");
+    }
+  } else {
+    MOZ_ASSERT(!mActor);
+    mState = StateClosing;
+  }
+}
+
+void
+BroadcastChannel::ActorFailed()
+{
+  MOZ_CRASH("Failed to create a PBackgroundChild actor!");
+}
+
+void
+BroadcastChannel::ActorCreated(PBackgroundChild* aActor)
+{
+  MOZ_ASSERT(aActor);
+
+  if (mState == StateClosed) {
+    return;
+  }
+
+  PBroadcastChannelChild* actor =
+    aActor->SendPBroadcastChannelConstructor(*mPrincipalInfo, mOrigin, mChannel);
+
+  mActor = static_cast<BroadcastChannelChild*>(actor);
+  MOZ_ASSERT(mActor);
+
+  mActor->SetParent(this);
+
+  // Flush pending messages.
+  for (uint32_t i = 0; i < mPendingMessages.Length(); ++i) {
+    PostMessageData(mPendingMessages[i]);
+  }
+
+  mPendingMessages.Clear();
+
+  if (mState == StateClosing) {
+    Shutdown();
+  }
+}
+
+void
+BroadcastChannel::Shutdown()
+{
+  mState = StateClosed;
+
+  // The DTOR of this WorkerHolder will release the worker for us.
+  mWorkerHolder = nullptr;
+
+  if (mActor) {
+    mActor->SetParent(nullptr);
+
+    RefPtr<TeardownRunnable> runnable = new TeardownRunnable(mActor);
+    NS_DispatchToCurrentThread(runnable);
+
+    mActor = nullptr;
+  }
+
+  // If shutdown() is called we have to release the reference if we still keep
+  // it.
+  if (mIsKeptAlive) {
+    mIsKeptAlive = false;
+    Release();
+  }
+}
+
+EventHandlerNonNull*
+BroadcastChannel::GetOnmessage()
+{
+  if (NS_IsMainThread()) {
+    return GetEventHandler(nsGkAtoms::onmessage, EmptyString());
+  }
+  return GetEventHandler(nullptr, NS_LITERAL_STRING("message"));
+}
+
+void
+BroadcastChannel::SetOnmessage(EventHandlerNonNull* aCallback)
+{
+  if (NS_IsMainThread()) {
+    SetEventHandler(nsGkAtoms::onmessage, EmptyString(), aCallback);
+  } else {
+    SetEventHandler(nullptr, NS_LITERAL_STRING("message"), aCallback);
+  }
+
+  UpdateMustKeepAlive();
+}
+
+void
+BroadcastChannel::AddEventListener(const nsAString& aType,
+                                   EventListener* aCallback,
+                                   const AddEventListenerOptionsOrBoolean& aOptions,
+                                   const dom::Nullable<bool>& aWantsUntrusted,
+                                   ErrorResult& aRv)
+{
+  DOMEventTargetHelper::AddEventListener(aType, aCallback, aOptions,
+                                         aWantsUntrusted, aRv);
+
+  if (aRv.Failed()) {
+    return;
+  }
+
+  UpdateMustKeepAlive();
+}
+
+void
+BroadcastChannel::RemoveEventListener(const nsAString& aType,
+                                      EventListener* aCallback,
+                                      const EventListenerOptionsOrBoolean& aOptions,
+                                      ErrorResult& aRv)
+{
+  DOMEventTargetHelper::RemoveEventListener(aType, aCallback, aOptions, aRv);
+
+  if (aRv.Failed()) {
+    return;
+  }
+
+  UpdateMustKeepAlive();
+}
+
+void
+BroadcastChannel::UpdateMustKeepAlive()
+{
+  bool toKeepAlive = HasListenersFor(NS_LITERAL_STRING("message"));
+  if (toKeepAlive == mIsKeptAlive) {
+    return;
+  }
+
+  mIsKeptAlive = toKeepAlive;
+
+  if (toKeepAlive) {
+    AddRef();
+  } else {
+    Release();
+  }
+}
+
+NS_IMETHODIMP
+BroadcastChannel::Observe(nsISupports* aSubject, const char* aTopic,
+                          const char16_t* aData)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!strcmp(aTopic, "inner-window-destroyed"));
+
+  // If the window is destroyed we have to release the reference that we are
+  // keeping.
+  nsCOMPtr<nsISupportsPRUint64> wrapper = do_QueryInterface(aSubject);
+  NS_ENSURE_TRUE(wrapper, NS_ERROR_FAILURE);
+
+  uint64_t innerID;
+  nsresult rv = wrapper->GetData(&innerID);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (innerID == mInnerID) {
+    nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+    if (obs) {
+      obs->RemoveObserver(this, "inner-window-destroyed");
+    }
+
+    Shutdown();
+  }
+
+  return NS_OK;
+}
+
+void
+BroadcastChannel::RemoveDocFromBFCache()
+{
+  if (!NS_IsMainThread()) {
+    return;
+  }
+
+  nsPIDOMWindowInner* window = GetOwner();
+  if (!window) {
+    return;
+  }
+
+  nsIDocument* doc = window->GetExtantDoc();
+  if (!doc) {
+    return;
+  }
+
+  nsCOMPtr<nsIBFCacheEntry> bfCacheEntry = doc->GetBFCacheEntry();
+  if (!bfCacheEntry) {
+    return;
+  }
+
+  bfCacheEntry->RemoveFromBFCacheSync();
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(BroadcastChannel)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(BroadcastChannel,
+                                                  DOMEventTargetHelper)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(BroadcastChannel,
+                                                DOMEventTargetHelper)
+  tmp->Shutdown();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(BroadcastChannel)
+  NS_INTERFACE_MAP_ENTRY(nsIIPCBackgroundChildCreateCallback)
+  NS_INTERFACE_MAP_ENTRY(nsIObserver)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+NS_IMPL_ADDREF_INHERITED(BroadcastChannel, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(BroadcastChannel, DOMEventTargetHelper)
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/broadcastchannel/BroadcastChannel.h b/dom/broadcastchannel/BroadcastChannel.h
new file mode 100644
index 0000000000..d7d46eeecc
--- /dev/null
+++ b/dom/broadcastchannel/BroadcastChannel.h
@@ -0,0 +1,134 @@
+/* -*- 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_BroadcastChannel_h
+#define mozilla_dom_BroadcastChannel_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/DOMEventTargetHelper.h"
+#include "nsAutoPtr.h"
+#include "nsIIPCBackgroundChildCreateCallback.h"
+#include "nsIObserver.h"
+#include "nsTArray.h"
+#include "mozilla/RefPtr.h"
+
+class nsPIDOMWindowInner;
+
+namespace mozilla {
+
+namespace ipc {
+class PrincipalInfo;
+} // namespace ipc
+
+namespace dom {
+
+namespace workers {
+class WorkerHolder;
+} // namespace workers
+
+class BroadcastChannelChild;
+class BroadcastChannelMessage;
+
+class BroadcastChannel final
+  : public DOMEventTargetHelper
+  , public nsIIPCBackgroundChildCreateCallback
+  , public nsIObserver
+{
+  friend class BroadcastChannelChild;
+
+  NS_DECL_NSIIPCBACKGROUNDCHILDCREATECALLBACK
+  NS_DECL_NSIOBSERVER
+
+  typedef mozilla::ipc::PrincipalInfo PrincipalInfo;
+
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(BroadcastChannel,
+                                           DOMEventTargetHelper)
+
+  virtual JSObject*
+  WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  static already_AddRefed<BroadcastChannel>
+  Constructor(const GlobalObject& aGlobal, const nsAString& aChannel,
+              ErrorResult& aRv);
+
+  void GetName(nsAString& aName) const
+  {
+    aName = mChannel;
+  }
+
+  void PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+                   ErrorResult& aRv);
+
+  void Close();
+
+  EventHandlerNonNull* GetOnmessage();
+  void SetOnmessage(EventHandlerNonNull* aCallback);
+
+  using nsIDOMEventTarget::AddEventListener;
+  using nsIDOMEventTarget::RemoveEventListener;
+
+  virtual void AddEventListener(const nsAString& aType,
+                                EventListener* aCallback,
+                                const AddEventListenerOptionsOrBoolean& aOptions,
+                                const Nullable<bool>& aWantsUntrusted,
+                                ErrorResult& aRv) override;
+  virtual void RemoveEventListener(const nsAString& aType,
+                                   EventListener* aCallback,
+                                   const EventListenerOptionsOrBoolean& aOptions,
+                                   ErrorResult& aRv) override;
+
+  void Shutdown();
+
+private:
+  BroadcastChannel(nsPIDOMWindowInner* aWindow,
+                   const PrincipalInfo& aPrincipalInfo,
+                   const nsACString& aOrigin,
+                   const nsAString& aChannel);
+
+  ~BroadcastChannel();
+
+  void PostMessageData(BroadcastChannelMessage* aData);
+
+  void PostMessageInternal(JSContext* aCx, JS::Handle<JS::Value> aMessage,
+                           ErrorResult& aRv);
+
+  void UpdateMustKeepAlive();
+
+  bool IsCertainlyAliveForCC() const override
+  {
+    return mIsKeptAlive;
+  }
+
+  void RemoveDocFromBFCache();
+
+  RefPtr<BroadcastChannelChild> mActor;
+  nsTArray<RefPtr<BroadcastChannelMessage>> mPendingMessages;
+
+  nsAutoPtr<workers::WorkerHolder> mWorkerHolder;
+
+  nsAutoPtr<PrincipalInfo> mPrincipalInfo;
+
+  nsCString mOrigin;
+  nsString mChannel;
+
+  bool mIsKeptAlive;
+
+  uint64_t mInnerID;
+
+  enum {
+    StateActive,
+    StateClosing,
+    StateClosed
+  } mState;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_BroadcastChannel_h
diff --git a/dom/broadcastchannel/BroadcastChannelChild.cpp b/dom/broadcastchannel/BroadcastChannelChild.cpp
new file mode 100644
index 0000000000..98bd219992
--- /dev/null
+++ b/dom/broadcastchannel/BroadcastChannelChild.cpp
@@ -0,0 +1,135 @@
+/* -*- 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 "BroadcastChannelChild.h"
+#include "BroadcastChannel.h"
+#include "jsapi.h"
+#include "mozilla/dom/ipc/BlobChild.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/MessageEvent.h"
+#include "mozilla/dom/MessageEventBinding.h"
+#include "mozilla/dom/WorkerPrivate.h"
+#include "mozilla/dom/WorkerScope.h"
+#include "mozilla/dom/ScriptSettings.h"
+#include "mozilla/ipc/PBackgroundChild.h"
+#include "mozilla/dom/ipc/StructuredCloneData.h"
+#include "WorkerPrivate.h"
+
+namespace mozilla {
+
+using namespace ipc;
+
+namespace dom {
+
+using namespace workers;
+
+BroadcastChannelChild::BroadcastChannelChild(const nsACString& aOrigin)
+  : mBC(nullptr)
+  , mActorDestroyed(false)
+{
+  CopyUTF8toUTF16(aOrigin, mOrigin);
+}
+
+BroadcastChannelChild::~BroadcastChannelChild()
+{
+  MOZ_ASSERT(!mBC);
+}
+
+bool
+BroadcastChannelChild::RecvNotify(const ClonedMessageData& aData)
+{
+  // Make sure to retrieve all blobs from the message before returning to avoid
+  // leaking their actors.
+  nsTArray<RefPtr<BlobImpl>> blobs;
+  if (!aData.blobsChild().IsEmpty()) {
+    blobs.SetCapacity(aData.blobsChild().Length());
+
+    for (uint32_t i = 0, len = aData.blobsChild().Length(); i < len; ++i) {
+      RefPtr<BlobImpl> impl =
+        static_cast<BlobChild*>(aData.blobsChild()[i])->GetBlobImpl();
+
+      blobs.AppendElement(impl);
+    }
+  }
+
+  nsCOMPtr<DOMEventTargetHelper> helper = mBC;
+  nsCOMPtr<EventTarget> eventTarget = do_QueryInterface(helper);
+
+  // The object is going to be deleted soon. No notify is required.
+  if (!eventTarget) {
+    return true;
+  }
+
+  // CheckInnerWindowCorrectness can be used also without a window when
+  // BroadcastChannel is running in a worker. In this case, it's a NOP.
+  if (NS_FAILED(mBC->CheckInnerWindowCorrectness())) {
+    return true;
+  }
+
+  mBC->RemoveDocFromBFCache();
+
+  AutoJSAPI jsapi;
+  nsCOMPtr<nsIGlobalObject> globalObject;
+
+  if (NS_IsMainThread()) {
+    globalObject = do_QueryInterface(mBC->GetParentObject());
+  } else {
+    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+    MOZ_ASSERT(workerPrivate);
+    globalObject = workerPrivate->GlobalScope();
+  }
+
+  if (!globalObject || !jsapi.Init(globalObject)) {
+    NS_WARNING("Failed to initialize AutoJSAPI object.");
+    return true;
+  }
+
+  ipc::StructuredCloneData cloneData;
+  cloneData.BlobImpls().AppendElements(blobs);
+
+  const SerializedStructuredCloneBuffer& buffer = aData.data();
+  JSContext* cx = jsapi.cx();
+  JS::Rooted<JS::Value> value(cx, JS::NullValue());
+  if (buffer.data.Size()) {
+    ErrorResult rv;
+    cloneData.UseExternalData(buffer.data);
+    cloneData.Read(cx, &value, rv);
+    if (NS_WARN_IF(rv.Failed())) {
+      rv.SuppressException();
+      return true;
+    }
+  }
+
+  RootedDictionary<MessageEventInit> init(cx);
+  init.mBubbles = false;
+  init.mCancelable = false;
+  init.mOrigin = mOrigin;
+  init.mData = value;
+
+  ErrorResult rv;
+  RefPtr<MessageEvent> event =
+    MessageEvent::Constructor(mBC, NS_LITERAL_STRING("message"), init, rv);
+  if (NS_WARN_IF(rv.Failed())) {
+    rv.SuppressException();
+    return true;
+  }
+
+  event->SetTrusted(true);
+
+  bool status;
+  mBC->DispatchEvent(static_cast<Event*>(event.get()), &status);
+
+  return true;
+}
+
+void
+BroadcastChannelChild::ActorDestroy(ActorDestroyReason aWhy)
+{
+  mActorDestroyed = true;
+}
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/broadcastchannel/BroadcastChannelChild.h b/dom/broadcastchannel/BroadcastChannelChild.h
new file mode 100644
index 0000000000..23cef899e7
--- /dev/null
+++ b/dom/broadcastchannel/BroadcastChannelChild.h
@@ -0,0 +1,59 @@
+/* -*- 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_BroadcastChannelChild_h
+#define mozilla_dom_BroadcastChannelChild_h
+
+#include "mozilla/dom/PBroadcastChannelChild.h"
+
+namespace mozilla {
+
+namespace ipc {
+class BackgroundChildImpl;
+} // namespace ipc
+
+namespace dom {
+
+class BroadcastChannel;
+
+class BroadcastChannelChild final : public PBroadcastChannelChild
+{
+  friend class mozilla::ipc::BackgroundChildImpl;
+
+public:
+  NS_INLINE_DECL_REFCOUNTING(BroadcastChannelChild)
+
+  void SetParent(BroadcastChannel* aBC)
+  {
+    mBC = aBC;
+  }
+
+  virtual bool RecvNotify(const ClonedMessageData& aData) override;
+
+  bool IsActorDestroyed() const
+  {
+    return mActorDestroyed;
+  }
+
+private:
+  explicit BroadcastChannelChild(const nsACString& aOrigin);
+  ~BroadcastChannelChild();
+
+  virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+
+  // This raw pointer is actually the parent object.
+  // It's set to null when the parent object is deleted.
+  BroadcastChannel* mBC;
+
+  nsString mOrigin;
+
+  bool mActorDestroyed;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_BroadcastChannelChild_h
diff --git a/dom/broadcastchannel/BroadcastChannelParent.cpp b/dom/broadcastchannel/BroadcastChannelParent.cpp
new file mode 100644
index 0000000000..f26292e1d4
--- /dev/null
+++ b/dom/broadcastchannel/BroadcastChannelParent.cpp
@@ -0,0 +1,102 @@
+/* -*- 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 "BroadcastChannelParent.h"
+#include "BroadcastChannelService.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/ipc/BlobParent.h"
+#include "mozilla/ipc/BackgroundParent.h"
+#include "mozilla/Unused.h"
+#include "nsIScriptSecurityManager.h"
+
+namespace mozilla {
+
+using namespace ipc;
+
+namespace dom {
+
+BroadcastChannelParent::BroadcastChannelParent(const nsAString& aOriginChannelKey)
+  : mService(BroadcastChannelService::GetOrCreate())
+  , mOriginChannelKey(aOriginChannelKey)
+{
+  AssertIsOnBackgroundThread();
+  mService->RegisterActor(this, mOriginChannelKey);
+}
+
+BroadcastChannelParent::~BroadcastChannelParent()
+{
+  AssertIsOnBackgroundThread();
+}
+
+bool
+BroadcastChannelParent::RecvPostMessage(const ClonedMessageData& aData)
+{
+  AssertIsOnBackgroundThread();
+
+  if (NS_WARN_IF(!mService)) {
+    return false;
+  }
+
+  mService->PostMessage(this, aData, mOriginChannelKey);
+  return true;
+}
+
+bool
+BroadcastChannelParent::RecvClose()
+{
+  AssertIsOnBackgroundThread();
+
+  if (NS_WARN_IF(!mService)) {
+    return false;
+  }
+
+  mService->UnregisterActor(this, mOriginChannelKey);
+  mService = nullptr;
+
+  Unused << Send__delete__(this);
+
+  return true;
+}
+
+void
+BroadcastChannelParent::ActorDestroy(ActorDestroyReason aWhy)
+{
+  AssertIsOnBackgroundThread();
+
+  if (mService) {
+    // This object is about to be released and with it, also mService will be
+    // released too.
+    mService->UnregisterActor(this, mOriginChannelKey);
+  }
+}
+
+void
+BroadcastChannelParent::Deliver(const ClonedMessageData& aData)
+{
+  AssertIsOnBackgroundThread();
+
+  // Duplicate the data for this parent.
+  ClonedMessageData newData(aData);
+
+  // Create new BlobParent objects for this message.
+  for (uint32_t i = 0, len = newData.blobsParent().Length(); i < len; ++i) {
+    RefPtr<BlobImpl> impl =
+      static_cast<BlobParent*>(newData.blobsParent()[i])->GetBlobImpl();
+
+    PBlobParent* blobParent =
+      BackgroundParent::GetOrCreateActorForBlobImpl(Manager(), impl);
+    if (!blobParent) {
+      return;
+    }
+
+    newData.blobsParent()[i] = blobParent;
+  }
+
+  Unused << SendNotify(newData);
+}
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/broadcastchannel/BroadcastChannelParent.h b/dom/broadcastchannel/BroadcastChannelParent.h
new file mode 100644
index 0000000000..e71354ca7a
--- /dev/null
+++ b/dom/broadcastchannel/BroadcastChannelParent.h
@@ -0,0 +1,50 @@
+/* -*- 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_BroadcastChannelParent_h
+#define mozilla_dom_BroadcastChannelParent_h
+
+#include "mozilla/dom/PBroadcastChannelParent.h"
+
+namespace mozilla {
+
+namespace ipc {
+class BackgroundParentImpl;
+class PrincipalInfo;
+} // namespace ipc
+
+namespace dom {
+
+class BroadcastChannelService;
+
+class BroadcastChannelParent final : public PBroadcastChannelParent
+{
+  friend class mozilla::ipc::BackgroundParentImpl;
+
+  typedef mozilla::ipc::PrincipalInfo PrincipalInfo;
+
+public:
+  void Deliver(const ClonedMessageData& aData);
+
+private:
+  explicit BroadcastChannelParent(const nsAString& aOriginChannelKey);
+  ~BroadcastChannelParent();
+
+  virtual bool
+  RecvPostMessage(const ClonedMessageData& aData) override;
+
+  virtual bool RecvClose() override;
+
+  virtual void ActorDestroy(ActorDestroyReason aWhy) override;
+
+  RefPtr<BroadcastChannelService> mService;
+  const nsString mOriginChannelKey;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_BroadcastChannelParent_h
diff --git a/dom/broadcastchannel/BroadcastChannelService.cpp b/dom/broadcastchannel/BroadcastChannelService.cpp
new file mode 100644
index 0000000000..f88108c3a3
--- /dev/null
+++ b/dom/broadcastchannel/BroadcastChannelService.cpp
@@ -0,0 +1,132 @@
+/* -*- 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 "BroadcastChannelService.h"
+#include "BroadcastChannelParent.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/ipc/BlobParent.h"
+#include "mozilla/ipc/BackgroundParent.h"
+
+#ifdef XP_WIN
+#undef PostMessage
+#endif
+
+namespace mozilla {
+
+using namespace ipc;
+
+namespace dom {
+
+namespace {
+
+BroadcastChannelService* sInstance = nullptr;
+
+} // namespace
+
+BroadcastChannelService::BroadcastChannelService()
+{
+  AssertIsOnBackgroundThread();
+
+  // sInstance is a raw BroadcastChannelService*.
+  MOZ_ASSERT(!sInstance);
+  sInstance = this;
+}
+
+BroadcastChannelService::~BroadcastChannelService()
+{
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(sInstance == this);
+  MOZ_ASSERT(mAgents.Count() == 0);
+
+  sInstance = nullptr;
+}
+
+// static
+already_AddRefed<BroadcastChannelService>
+BroadcastChannelService::GetOrCreate()
+{
+  AssertIsOnBackgroundThread();
+
+  RefPtr<BroadcastChannelService> instance = sInstance;
+  if (!instance) {
+    instance = new BroadcastChannelService();
+  }
+  return instance.forget();
+}
+
+void
+BroadcastChannelService::RegisterActor(BroadcastChannelParent* aParent,
+                                       const nsAString& aOriginChannelKey)
+{
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(aParent);
+
+  nsTArray<BroadcastChannelParent*>* parents;
+  if (!mAgents.Get(aOriginChannelKey, &parents)) {
+    parents = new nsTArray<BroadcastChannelParent*>();
+    mAgents.Put(aOriginChannelKey, parents);
+  }
+
+  MOZ_ASSERT(!parents->Contains(aParent));
+  parents->AppendElement(aParent);
+}
+
+void
+BroadcastChannelService::UnregisterActor(BroadcastChannelParent* aParent,
+                                         const nsAString& aOriginChannelKey)
+{
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(aParent);
+
+  nsTArray<BroadcastChannelParent*>* parents;
+  if (!mAgents.Get(aOriginChannelKey, &parents)) {
+    MOZ_CRASH("Invalid state");
+  }
+
+  parents->RemoveElement(aParent);
+  if (parents->IsEmpty()) {
+    mAgents.Remove(aOriginChannelKey);
+  }
+}
+
+void
+BroadcastChannelService::PostMessage(BroadcastChannelParent* aParent,
+                                     const ClonedMessageData& aData,
+                                     const nsAString& aOriginChannelKey)
+{
+  AssertIsOnBackgroundThread();
+  MOZ_ASSERT(aParent);
+
+  nsTArray<BroadcastChannelParent*>* parents;
+  if (!mAgents.Get(aOriginChannelKey, &parents)) {
+    MOZ_CRASH("Invalid state");
+  }
+
+  // We need to keep the array alive for the life-time of this operation.
+  nsTArray<RefPtr<BlobImpl>> blobs;
+  if (!aData.blobsParent().IsEmpty()) {
+    blobs.SetCapacity(aData.blobsParent().Length());
+
+    for (uint32_t i = 0, len = aData.blobsParent().Length(); i < len; ++i) {
+      RefPtr<BlobImpl> impl =
+        static_cast<BlobParent*>(aData.blobsParent()[i])->GetBlobImpl();
+     MOZ_ASSERT(impl);
+     blobs.AppendElement(impl);
+    }
+  }
+
+  for (uint32_t i = 0; i < parents->Length(); ++i) {
+    BroadcastChannelParent* parent = parents->ElementAt(i);
+    MOZ_ASSERT(parent);
+
+    if (parent != aParent) {
+      parent->Deliver(aData);
+    }
+  }
+}
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/broadcastchannel/BroadcastChannelService.h b/dom/broadcastchannel/BroadcastChannelService.h
new file mode 100644
index 0000000000..3934a7ebfd
--- /dev/null
+++ b/dom/broadcastchannel/BroadcastChannelService.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_BroadcastChannelService_h
+#define mozilla_dom_BroadcastChannelService_h
+
+#include "nsISupportsImpl.h"
+#include "nsHashKeys.h"
+#include "nsClassHashtable.h"
+
+#ifdef XP_WIN
+#undef PostMessage
+#endif
+
+namespace mozilla {
+namespace dom {
+
+class BroadcastChannelParent;
+class ClonedMessageData;
+
+class BroadcastChannelService final
+{
+public:
+  NS_INLINE_DECL_REFCOUNTING(BroadcastChannelService)
+
+  static already_AddRefed<BroadcastChannelService> GetOrCreate();
+
+  void RegisterActor(BroadcastChannelParent* aParent,
+                     const nsAString& aOriginChannelKey);
+  void UnregisterActor(BroadcastChannelParent* aParent,
+                       const nsAString& aOriginChannelKey);
+
+  void PostMessage(BroadcastChannelParent* aParent,
+                   const ClonedMessageData& aData,
+                   const nsAString& aOriginChannelKey);
+
+private:
+  BroadcastChannelService();
+  ~BroadcastChannelService();
+
+  // Raw Pointers because the actors keep alive this service.
+  nsClassHashtable<nsStringHashKey,
+                  nsTArray<BroadcastChannelParent*>> mAgents;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_BroadcastChannelService_h
diff --git a/dom/broadcastchannel/PBroadcastChannel.ipdl b/dom/broadcastchannel/PBroadcastChannel.ipdl
new file mode 100644
index 0000000000..4b4a531067
--- /dev/null
+++ b/dom/broadcastchannel/PBroadcastChannel.ipdl
@@ -0,0 +1,29 @@
+/* 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 protocol PBackground;
+include protocol PBlob;
+include DOMTypes;
+
+using struct mozilla::SerializedStructuredCloneBuffer from "ipc/IPCMessageUtils.h";
+
+namespace mozilla {
+namespace dom {
+
+// This protocol is used for the BroadcastChannel API
+protocol PBroadcastChannel
+{
+  manager PBackground;
+
+parent:
+  async PostMessage(ClonedMessageData message);
+  async Close();
+
+child:
+  async Notify(ClonedMessageData message);
+  async __delete__();
+};
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/broadcastchannel/moz.build b/dom/broadcastchannel/moz.build
new file mode 100644
index 0000000000..a076331e58
--- /dev/null
+++ b/dom/broadcastchannel/moz.build
@@ -0,0 +1,31 @@
+# -*- 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/.
+
+EXPORTS.mozilla.dom += [
+    'BroadcastChannel.h',
+]
+
+UNIFIED_SOURCES += [
+    'BroadcastChannel.cpp',
+    'BroadcastChannelChild.cpp',
+    'BroadcastChannelParent.cpp',
+    'BroadcastChannelService.cpp',
+]
+
+IPDL_SOURCES += [
+    'PBroadcastChannel.ipdl',
+]
+
+LOCAL_INCLUDES += [
+    '../workers',
+]
+
+MOCHITEST_MANIFESTS += ['tests/mochitest.ini']
+BROWSER_CHROME_MANIFESTS += ['tests/browser.ini']
+
+include('/ipc/chromium/chromium-config.mozbuild')
+
+FINAL_LIBRARY = 'xul'
diff --git a/dom/broadcastchannel/tests/blank.html b/dom/broadcastchannel/tests/blank.html
new file mode 100644
index 0000000000..358db717dd
--- /dev/null
+++ b/dom/broadcastchannel/tests/blank.html
@@ -0,0 +1,2 @@
+<!DOCTYPE HTML>
+<html><body></body></html>
diff --git a/dom/broadcastchannel/tests/broadcastchannel_sharedWorker.js b/dom/broadcastchannel/tests/broadcastchannel_sharedWorker.js
new file mode 100644
index 0000000000..4dad5ae825
--- /dev/null
+++ b/dom/broadcastchannel/tests/broadcastchannel_sharedWorker.js
@@ -0,0 +1,12 @@
+onconnect = function(evt) {
+  evt.ports[0].onmessage = function(evt) {
+    var bc = new BroadcastChannel('foobar');
+    bc.addEventListener('message', function(event) {
+      bc.postMessage(event.data == "hello world from the window" ?
+                       "hello world from the worker" : "KO");
+      bc.close();
+    }, false);
+
+    evt.target.postMessage("READY");
+  }
+}
diff --git a/dom/broadcastchannel/tests/broadcastchannel_worker.js b/dom/broadcastchannel/tests/broadcastchannel_worker.js
new file mode 100644
index 0000000000..4714d59d02
--- /dev/null
+++ b/dom/broadcastchannel/tests/broadcastchannel_worker.js
@@ -0,0 +1,18 @@
+onmessage = function(evt) {
+  if (evt.data != 0) {
+    var worker = new Worker("broadcastchannel_worker.js");
+    worker.onmessage = function(evt) {
+      postMessage(evt.data);
+    }
+    worker.postMessage(evt.data - 1);
+    return;
+  }
+
+  var bc = new BroadcastChannel('foobar');
+  bc.addEventListener('message', function(event) {
+    bc.postMessage(event.data == "hello world from the window" ? "hello world from the worker" : "KO");
+    bc.close();
+  }, false);
+
+  postMessage("READY");
+}
diff --git a/dom/broadcastchannel/tests/broadcastchannel_worker_alive.js b/dom/broadcastchannel/tests/broadcastchannel_worker_alive.js
new file mode 100644
index 0000000000..78ab44015c
--- /dev/null
+++ b/dom/broadcastchannel/tests/broadcastchannel_worker_alive.js
@@ -0,0 +1,8 @@
+(new BroadcastChannel('foobar')).postMessage('READY');
+
+(new BroadcastChannel('foobar')).addEventListener('message', function(event) {
+  if (event.data != 'READY') {
+    event.target.postMessage(event.data);
+  }
+}, false);
+
diff --git a/dom/broadcastchannel/tests/broadcastchannel_worker_any.js b/dom/broadcastchannel/tests/broadcastchannel_worker_any.js
new file mode 100644
index 0000000000..da8625c4d8
--- /dev/null
+++ b/dom/broadcastchannel/tests/broadcastchannel_worker_any.js
@@ -0,0 +1,5 @@
+(new BroadcastChannel('foobar')).onmessage = function(event) {
+  event.target.postMessage(event.data);
+}
+
+postMessage("READY");
diff --git a/dom/broadcastchannel/tests/browser.ini b/dom/broadcastchannel/tests/browser.ini
new file mode 100644
index 0000000000..b036a1e9bf
--- /dev/null
+++ b/dom/broadcastchannel/tests/browser.ini
@@ -0,0 +1,6 @@
+[DEFAULT]
+skip-if = os == 'android'
+support-files =
+  blank.html
+
+[browser_private_browsing.js]
diff --git a/dom/broadcastchannel/tests/browser_private_browsing.js b/dom/broadcastchannel/tests/browser_private_browsing.js
new file mode 100644
index 0000000000..5724225fc3
--- /dev/null
+++ b/dom/broadcastchannel/tests/browser_private_browsing.js
@@ -0,0 +1,74 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const URL = "http://mochi.test:8888/browser/dom/broadcastchannel/tests/blank.html";
+
+add_task(function*() {
+  var win1 = OpenBrowserWindow({private: true});
+  var win1Promise = new win1.Promise(resolve => {
+    win1.addEventListener("load", function onLoad() {
+      win1.removeEventListener("load", onLoad, false);
+      resolve();
+    });
+  });
+  yield win1Promise;
+
+  var win2 = OpenBrowserWindow({private: false});
+  var win2Promise = new win2.Promise(resolve => {
+    win2.addEventListener("load", function onLoad() {
+      win2.removeEventListener("load", onLoad, false);
+      resolve();
+    });
+  });
+  yield win2Promise;
+
+  var tab1 = win1.gBrowser.addTab(URL);
+  yield BrowserTestUtils.browserLoaded(win1.gBrowser.getBrowserForTab(tab1));
+  var browser1 = gBrowser.getBrowserForTab(tab1);
+
+  var tab2 = win2.gBrowser.addTab(URL);
+  yield BrowserTestUtils.browserLoaded(win2.gBrowser.getBrowserForTab(tab2));
+  var browser2 = gBrowser.getBrowserForTab(tab2);
+
+  var p1 = ContentTask.spawn(browser1, null, function(opts) {
+    return new content.window.Promise(resolve => {
+      content.window.bc = new content.window.BroadcastChannel('foobar');
+      content.window.bc.onmessage = function(e) { resolve(e.data); }
+    });
+  });
+
+  var p2 = ContentTask.spawn(browser2, null, function(opts) {
+    return new content.window.Promise(resolve => {
+      content.window.bc = new content.window.BroadcastChannel('foobar');
+      content.window.bc.onmessage = function(e) { resolve(e.data); }
+    });
+  });
+
+  yield ContentTask.spawn(browser1, null, function(opts) {
+    return new content.window.Promise(resolve => {
+      var bc = new content.window.BroadcastChannel('foobar');
+      bc.postMessage('hello world from private browsing');
+      resolve();
+    });
+  });
+
+  yield ContentTask.spawn(browser2, null, function(opts) {
+    return new content.window.Promise(resolve => {
+      var bc = new content.window.BroadcastChannel('foobar');
+      bc.postMessage('hello world from non private browsing');
+      resolve();
+    });
+  });
+
+  var what1 = yield p1;
+  ok(what1, 'hello world from private browsing', 'No messages received from the other window.');
+
+  var what2 = yield p2;
+  ok(what1, 'hello world from non private browsing', 'No messages received from the other window.');
+
+  yield BrowserTestUtils.removeTab(tab1);
+  yield BrowserTestUtils.closeWindow(win1);
+
+  yield BrowserTestUtils.removeTab(tab2);
+  yield BrowserTestUtils.closeWindow(win2);
+});
diff --git a/dom/broadcastchannel/tests/file_mozbrowser.html b/dom/broadcastchannel/tests/file_mozbrowser.html
new file mode 100644
index 0000000000..5f69021320
--- /dev/null
+++ b/dom/broadcastchannel/tests/file_mozbrowser.html
@@ -0,0 +1,20 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>MozBrowser iframe</title>
+</head>
+<body>
+<div id="container"></div>
+  <script type="application/javascript;version=1.7">
+
+  var ifr = document.createElement('iframe');
+  ifr.src = 'http://mochi.test:8888/tests/dom/broadcastchannel/tests/iframe_mozbrowser.html';
+  ifr.onload = function() { alert('DONE'); }
+
+  var domParent = document.getElementById('container');
+  domParent.appendChild(ifr);
+
+  </script>
+</body>
+</html>
diff --git a/dom/broadcastchannel/tests/file_mozbrowser2.html b/dom/broadcastchannel/tests/file_mozbrowser2.html
new file mode 100644
index 0000000000..85abce7bff
--- /dev/null
+++ b/dom/broadcastchannel/tests/file_mozbrowser2.html
@@ -0,0 +1,21 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>MozBrowser iframe</title>
+</head>
+<body>
+<div id="container"></div>
+  <script type="application/javascript;version=1.7">
+
+  var ifr = document.createElement('iframe');
+  ifr.setAttribute('mozbrowser', true);
+  ifr.src = 'http://mochi.test:8888/tests/dom/broadcastchannel/tests/iframe_mozbrowser2.html';
+  ifr.onload = function() { alert('DONE'); }
+
+  var domParent = document.getElementById('container');
+  domParent.appendChild(ifr);
+
+  </script>
+</body>
+</html>
diff --git a/dom/broadcastchannel/tests/iframe_broadcastchannel.html b/dom/broadcastchannel/tests/iframe_broadcastchannel.html
new file mode 100644
index 0000000000..fb9a12b4bd
--- /dev/null
+++ b/dom/broadcastchannel/tests/iframe_broadcastchannel.html
@@ -0,0 +1,35 @@
+<!DOCTYPE HTML>
+<html>
+<body>
+  <script type="application/javascript">
+
+function is(a, b, msg) {
+  ok(a == b, msg);
+}
+
+function ok(a, msg) {
+  window.parent.postMessage({ status: a ? "OK" : "KO", message: msg }, "*");
+}
+
+ok("BroadcastChannel" in window, "BroadcastChannel exists");
+
+var bc = new BroadcastChannel("foobar");
+ok(bc, "BroadcastChannel can be created");
+is(bc.name, 'foobar', "BroadcastChannel.name is foobar");
+
+ok("postMessage" in bc, "BroadcastChannel has postMessage() method");
+
+bc.onmessage = function(evt) {
+  ok(evt instanceof MessageEvent, 'evt is a MessageEvent');
+  is(evt.target, bc, 'MessageEvent.target is bc');
+  is(evt.target.name, 'foobar', 'MessageEvent.target.name is foobar');
+  is(evt.target.name, bc.name, 'MessageEvent.target.name is bc.name');
+  is(evt.data, "Hello world from the window!", "Message received from the window");
+  bc.postMessage("Hello world from the iframe!");
+}
+
+  </script>
+</body>
+</html>
+
+
diff --git a/dom/broadcastchannel/tests/iframe_mozbrowser.html b/dom/broadcastchannel/tests/iframe_mozbrowser.html
new file mode 100644
index 0000000000..dbcf63d883
--- /dev/null
+++ b/dom/broadcastchannel/tests/iframe_mozbrowser.html
@@ -0,0 +1,15 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>MozBrowser iframe</title>
+</head>
+<body>
+  <script type="application/javascript;version=1.7">
+
+var bc = new BroadcastChannel('foobar');
+bc.postMessage('This is wrong!');
+
+  </script>
+</body>
+</html>
diff --git a/dom/broadcastchannel/tests/iframe_mozbrowser2.html b/dom/broadcastchannel/tests/iframe_mozbrowser2.html
new file mode 100644
index 0000000000..dbcf63d883
--- /dev/null
+++ b/dom/broadcastchannel/tests/iframe_mozbrowser2.html
@@ -0,0 +1,15 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>MozBrowser iframe</title>
+</head>
+<body>
+  <script type="application/javascript;version=1.7">
+
+var bc = new BroadcastChannel('foobar');
+bc.postMessage('This is wrong!');
+
+  </script>
+</body>
+</html>
diff --git a/dom/broadcastchannel/tests/mochitest.ini b/dom/broadcastchannel/tests/mochitest.ini
new file mode 100644
index 0000000000..6dff47db48
--- /dev/null
+++ b/dom/broadcastchannel/tests/mochitest.ini
@@ -0,0 +1,24 @@
+[DEFAULT]
+support-files =
+  iframe_broadcastchannel.html
+  broadcastchannel_sharedWorker.js
+  broadcastchannel_worker.js
+  broadcastchannel_worker_alive.js
+  broadcastchannel_worker_any.js
+  file_mozbrowser.html
+  file_mozbrowser2.html
+  iframe_mozbrowser.html
+  iframe_mozbrowser2.html
+
+[test_broadcastchannel_any.html]
+[test_broadcastchannel_basic.html]
+[test_broadcastchannel_close.html]
+[test_broadcastchannel_close2.html]
+[test_broadcastchannel_self.html]
+[test_broadcastchannel_sharedWorker.html]
+[test_broadcastchannel_worker.html]
+[test_broadcastchannel_worker_alive.html]
+[test_bfcache.html]
+[test_invalidState.html]
+[test_ordering.html]
+[test_dataCloning.html]
diff --git a/dom/broadcastchannel/tests/test_bfcache.html b/dom/broadcastchannel/tests/test_bfcache.html
new file mode 100644
index 0000000000..e42496bac8
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_bfcache.html
@@ -0,0 +1,96 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test for bfcache and BroadcastChannel</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+  <script type="application/javascript">
+
+  /* This test is hard to follow so here a quick description of what it is about.
+   * We want to test that when BroadcastChannel is used in a bfcached page,
+   * this page is fully removed by bfcache.
+   *
+   * To test it we have 2 pages (testUrl1 and testUrl2).
+   * The steps are:
+   * - we show testUrl1. When this is shown page1Shown is called.
+   * - page1Shown creates a BroadcastChannel object, then it loads testUrl2.
+   * - page2Shown is called by testUrl2.
+   * - Based on expectedPersisted we use or not the BroadcastChannel object of
+   *   testUrl1.
+   * - Then we call history.back() and testUrl1 will be loaded again.
+   * - when page1Shown is called by testUrl1, if BroadcastChannel has been used
+   *   when testUrl2 was shown, we want event.persisted be false, otherwise
+   *   true.
+   */
+  var testUrl1 = "data:text/html,<script>onpageshow = function(e) { opener.page1Shown(e); };<" + "/script>";
+  var testUrl2 = "data:text/html,<script>onpageshow = function(e) { opener.page2Shown(e); };<" + "/script>";
+
+  var testWin;
+  var counter = 0;
+  var expectedPersisted = false;
+  var bc;
+
+  function page1Shown(e) {
+    info("Page1Shown: " + testWin.location.href);
+
+    if (counter == 0) {
+      ok(!e.persisted, "test page should have been persisted initially");
+
+      bc = new testWin.BroadcastChannel('a');
+
+      SimpleTest.executeSoon(function() {
+        info("New location: " + testUrl2);
+        testWin.location.href = testUrl2;
+      });
+    } else {
+      is(e.persisted, expectedPersisted, "test page should have been persisted in pageshow");
+      testWin.close();
+      runTest();
+    }
+
+    counter++;
+  }
+
+  function page2Shown(e) {
+    info("Page2Shown: " + testWin.location.href);
+
+    if (!expectedPersisted) {
+      SimpleTest.executeSoon(function() {
+        info("Posting a message.");
+        bc.postMessage(42);
+      });
+    }
+
+    SimpleTest.executeSoon(function() {
+      info("Going back");
+      testWin.history.back();
+    });
+  }
+
+  var tests = [
+    { expectedPersisted: true },
+    { expectedPersisted: false },
+  ];
+
+  function runTest() {
+    if (!tests.length) {
+      SimpleTest.finish();
+      return;
+    }
+
+    var test = tests.shift();
+
+    counter = 0;
+    expectedPersisted = test.expectedPersisted;
+    testWin = window.open(testUrl1);
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  runTest();
+
+  </script>
+</body>
+</html>
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_any.html b/dom/broadcastchannel/tests/test_broadcastchannel_any.html
new file mode 100644
index 0000000000..2225e7cad9
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_any.html
@@ -0,0 +1,138 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for BroadcastChannel</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<div id="content"></div>
+
+<script type="application/javascript">
+
+var tests = [
+ 'hello world',
+ 123,
+ null,
+ true,
+ new Date(),
+ [ 1, 'test', true, new Date() ],
+ { a: true, b:  null, c: new Date(), d: [ true, false, {} ] },
+ new Blob([123], { type: 'plain/text' })
+];
+
+var currentTest = null;
+
+function getType(a) {
+  if (a === null || a === undefined)
+    return 'null';
+
+  if (Array.isArray(a))
+    return 'array';
+
+  if (typeof a == 'object')
+    return 'object';
+
+  return 'primitive';
+}
+
+function compare(a, b) {
+  is (getType(a), getType(b), 'Type matches');
+
+  var type = getType(a);
+  if (type == 'array') {
+    is (a.length, b.length, 'Array.length matches');
+    for (var i = 0; i < a.length; ++i) {
+      compare(a[i], b[i]);
+    }
+
+    return;
+  }
+
+  if (type == 'object') {
+    ok (a !== b, 'They should not match');
+
+    var aProps = [];
+    for (var p in a) aProps.push(p);
+
+    var bProps = [];
+    for (var p in b) bProps.push(p);
+
+    is (aProps.length, bProps.length, 'Props match');
+    is (aProps.sort().toSource(), bProps.sort().toSource(), 'Props match - using toSource()');
+
+    for (var p in a) {
+      compare(a[p], b[p]);
+    }
+
+    return;
+  }
+
+  if (type != 'null') {
+    is (a.toSource(), b.toSource(), 'Matching using toSource()');
+  }
+}
+
+function runTest() {
+  var count = 2;
+
+  var bc = new BroadcastChannel("foobar");
+  ok(bc, "BroadcastChannel can be created");
+
+  bc.onmessage = function(event) {
+    ok(count < 2, "Still comparing...");
+    info("bc: " + currentTest);
+    compare(event.data, currentTest);
+    ++count;
+    next();
+  }
+
+  var bc2 = new BroadcastChannel("foobar");
+  ok(bc2, "BroadcastChannel can be created");
+
+  var toSkip = true;
+  bc2.onmessage = function(event) {
+    toSkip = !toSkip;
+    if (toSkip) return;
+
+    ok(count < 2, "Still comparing...");
+    info("bc2: " + currentTest);
+    compare(event.data, currentTest);
+    ++count;
+    next();
+  }
+
+  function next() {
+    if (count < 2) {
+      return;
+    }
+
+    is(count, 2, "Just 2 comparations");
+    count = 0;
+
+    if (!tests.length) {
+      SimpleTest.finish();
+      return;
+    }
+
+    currentTest = tests.shift();
+    bc.postMessage(currentTest);
+    info("Posted: " + currentTest);
+  }
+
+  var worker = new Worker("broadcastchannel_worker_any.js");
+  worker.onmessage = function(event) {
+    if (event.data == "READY") {
+      next();
+    }
+  };
+}
+
+SimpleTest.waitForExplicitFinish();
+runTest();
+
+</script>
+</body>
+</html>
+
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_basic.html b/dom/broadcastchannel/tests/test_broadcastchannel_basic.html
new file mode 100644
index 0000000000..45fa3c4a9d
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_basic.html
@@ -0,0 +1,68 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for BroadcastChannel</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<div id="content"></div>
+
+<script type="application/javascript">
+
+function runTest() {
+  addEventListener('message', receiveMessage, false);
+  function receiveMessage(evt) {
+    if (evt.data.status == 'OK') {
+      ok(true, evt.data.message);
+    } else if (evt.data.status == 'KO') {
+      ok(false, evt.data.message);
+    } else {
+      ok(false, "Unknown message");
+    }
+  }
+
+  ok("BroadcastChannel" in window, "BroadcastChannel exists");
+
+  var bc = new BroadcastChannel("foobar");
+  ok(bc, "BroadcastChannel can be created");
+  is(bc.name, 'foobar', "BroadcastChannel.name is foobar");
+
+  ok("postMessage" in bc, "BroadcastChannel has postMessage() method");
+
+  bc.onmessage = function(evt) {
+    ok(evt instanceof MessageEvent, "This is a MessageEvent");
+    is(evt.target, bc, "MessageEvent.target is bc");
+    is(evt.target.name, 'foobar', "MessageEvent.target.name is foobar");
+    is(evt.target.name, bc.name, "MessageEvent.target.name == bc.name");
+    ok(evt.origin.indexOf('http://mochi.test:8888') == 0, "MessageEvent.origin is correct");
+    is(evt.data, "Hello world from the iframe!", "The message from the iframe has been received!");
+    SimpleTest.finish();
+  }
+
+  var div = document.getElementById("content");
+  ok(div, "Parent exists");
+
+  var ifr = document.createElement("iframe");
+  ifr.addEventListener("load", iframeLoaded, false);
+  ifr.setAttribute('src', "iframe_broadcastchannel.html");
+  div.appendChild(ifr);
+
+  function iframeLoaded() {
+    bc.postMessage("Hello world from the window!");
+  }
+
+  // A leak test
+  var dummyBc = new BroadcastChannel("dont_leak_this");
+  dummyBc.foo = "bar";
+  // don't add message listener!
+}
+
+SimpleTest.waitForExplicitFinish();
+runTest();
+
+</script>
+</body>
+</html>
+
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_close.html b/dom/broadcastchannel/tests/test_broadcastchannel_close.html
new file mode 100644
index 0000000000..84d41db4f9
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_close.html
@@ -0,0 +1,61 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for BroadcastChannel</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<div id="content"></div>
+
+<script type="application/javascript">
+
+function runTest() {
+  var receiver = new BroadcastChannel('foo');
+  var sequence = [ '2', 'done' ];
+  receiver.onmessage = function(e) {
+    if (!sequence.length) {
+      ok (false, 'No more data is expected');
+      return;
+    }
+
+    var data = sequence.shift();
+    is(e.data, data);
+
+    if (!sequence.length) {
+      SimpleTest.executeSoon(function() {
+        SimpleTest.finish();
+      });
+    }
+  }
+
+  var x = new BroadcastChannel('foo');
+  x.close();
+  try {
+    x.postMessage('1');
+    ok(false, "PostMessage should throw if called after a close().");
+  } catch(e) {
+    ok(true, "PostMessage should throw if called after a close().");
+  }
+
+  var y = new BroadcastChannel('foo');
+  y.postMessage('2');
+  y.close();
+  try {
+    y.postMessage('3');
+    ok(false, "PostMessage should throw if called after a close().");
+  } catch(e) {
+    ok(true, "PostMessage should throw if called after a close().");
+  }
+
+  var z = new BroadcastChannel('foo');
+  z.postMessage('done');
+}
+
+SimpleTest.waitForExplicitFinish();
+runTest();
+
+</script>
+</body>
+</html>
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_close2.html b/dom/broadcastchannel/tests/test_broadcastchannel_close2.html
new file mode 100644
index 0000000000..a8a748c462
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_close2.html
@@ -0,0 +1,39 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for BroadcastChannel</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<div id="content"></div>
+
+<script type="application/javascript">
+
+function runTest() {
+  var c1 = new BroadcastChannel('foo');
+  var c2 = new BroadcastChannel('foo');
+
+  var status = [];
+  c2.onmessage = function(e) {
+    status.push(e.data);
+    if (status.length == 2) {
+      is (status[0], 'first', "First message has been received");
+      is (status[1], 'second', "Second message has been received");
+      SimpleTest.finish();
+    }
+
+    c2.close();
+  }
+
+  c1.postMessage('first');
+  c1.postMessage('second');
+}
+
+SimpleTest.waitForExplicitFinish();
+runTest();
+
+</script>
+</body>
+</html>
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_self.html b/dom/broadcastchannel/tests/test_broadcastchannel_self.html
new file mode 100644
index 0000000000..32df390be1
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_self.html
@@ -0,0 +1,38 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for BroadcastChannel</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<div id="content"></div>
+
+<script type="application/javascript">
+
+function runTest() {
+  x = new BroadcastChannel('foo');
+  y = new BroadcastChannel('foo');
+
+  function func(e) {
+    is(e.target, y, "The target is !x");
+
+    SimpleTest.executeSoon(function() {
+      SimpleTest.finish();
+    });
+  }
+
+  x.onmessage = func;
+  y.onmessage = func;
+
+  x.postMessage('foo');
+}
+
+SimpleTest.waitForExplicitFinish();
+runTest();
+
+</script>
+</body>
+</html>
+
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_sharedWorker.html b/dom/broadcastchannel/tests/test_broadcastchannel_sharedWorker.html
new file mode 100644
index 0000000000..16f847acae
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_sharedWorker.html
@@ -0,0 +1,52 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<!--
+Tests of DOM BroadcastChannel in SharedWorkers
+-->
+<head>
+  <title>Test for BroadcastChannel in SharedWorkers</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script class="testbody" language="javascript">
+
+function runTests() {
+  var worker = new SharedWorker("broadcastchannel_sharedWorker.js");
+
+  var bc = new BroadcastChannel('foobar');
+
+  worker.port.onmessage = function(event) {
+    if (event.data == "READY") {
+      ok(true, "SharedWorker is ready!");
+      bc.postMessage('hello world from the window');
+    } else {
+      ok(false, "Something wrong happened");
+    }
+  };
+
+  bc.onmessage = function(event) {
+    is("hello world from the worker", event.data, "The message matches!");
+    bc.close();
+    SimpleTest.finish();
+  }
+
+  worker.port.postMessage('go');
+}
+
+SimpleTest.waitForExplicitFinish();
+runTests();
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_worker.html b/dom/broadcastchannel/tests/test_broadcastchannel_worker.html
new file mode 100644
index 0000000000..42e93cc1e1
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_worker.html
@@ -0,0 +1,62 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<!--
+Tests of DOM BroadcastChannel in workers
+-->
+<head>
+  <title>Test for BroadcastChannel in workers</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script class="testbody" language="javascript">
+
+function testWorker(x) {
+  var worker = new Worker("broadcastchannel_worker.js");
+
+  var bc = new BroadcastChannel('foobar');
+
+  worker.onmessage = function(event) {
+    if (event.data == "READY") {
+      ok(true, "Worker is ready!");
+      bc.postMessage('hello world from the window');
+    } else {
+      ok(false, "Something wrong happened");
+    }
+  };
+
+  bc.onmessage = function(event) {
+    is("hello world from the worker", event.data, "The message matches!");
+    bc.close();
+    runTests();
+  }
+
+  worker.postMessage(x);
+}
+
+var tests = [ 0, 3 ];
+function runTests() {
+  if (tests.length == 0) {
+    SimpleTest.finish();
+    return;
+  }
+
+  testWorker(tests.shift());
+}
+
+SimpleTest.waitForExplicitFinish();
+runTests();
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/broadcastchannel/tests/test_broadcastchannel_worker_alive.html b/dom/broadcastchannel/tests/test_broadcastchannel_worker_alive.html
new file mode 100644
index 0000000000..8b1b03c4e7
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_broadcastchannel_worker_alive.html
@@ -0,0 +1,56 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<!--
+Tests of DOM BroadcastChannel in workers
+-->
+<head>
+  <title>Test for BroadcastChannel in workers</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script class="testbody" language="javascript">
+
+function runTests() {
+  var id = 0;
+  (new BroadcastChannel('foobar')).onmessage = function(event) {
+    info("MSG: " + event.data);
+
+    if (event.data == "READY") {
+      ok(true, "Worker is ready!");
+    } else {
+      is(id, event.data, "The message is correct: " + id);
+    }
+
+    for (var i = 0; i < 3; ++i) {
+      SpecialPowers.forceCC();
+      SpecialPowers.forceGC();
+    }
+
+    if (id == 5) {
+      SimpleTest.finish();
+      return;
+    }
+
+    event.target.postMessage(++id);
+  };
+
+  new Worker("broadcastchannel_worker_alive.js");
+}
+
+SimpleTest.waitForExplicitFinish();
+runTests();
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/broadcastchannel/tests/test_dataCloning.html b/dom/broadcastchannel/tests/test_dataCloning.html
new file mode 100644
index 0000000000..6aa164e944
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_dataCloning.html
@@ -0,0 +1,27 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for BroadcastChannel.postMessage invalid State</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<div id="content"></div>
+
+<script type="application/javascript">
+
+
+let c = new BroadcastChannel("foo");
+
+try  {
+  c.postMessage(Symbol());
+  ok(false, "This should throw!");
+} catch(e) {
+  ok(true, "This should throw!");
+  is(e.name, "DataCloneError", "Correct DataCloneError exception thrown");
+}
+
+</script>
+</body>
+</html>
diff --git a/dom/broadcastchannel/tests/test_invalidState.html b/dom/broadcastchannel/tests/test_invalidState.html
new file mode 100644
index 0000000000..8e4a1df354
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_invalidState.html
@@ -0,0 +1,28 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for BroadcastChannel.postMessage invalid State</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<div id="content"></div>
+
+<script type="application/javascript">
+
+var c = new BroadcastChannel("foo");
+c.close();
+
+try  {
+  c.postMessage("bar");
+  ok(false, "This should throw!");
+} catch(e) {
+  ok(true, "This should throw!");
+  is(e.name, "InvalidStateError", "Correct invalid-state exception thrown");
+}
+
+</script>
+</body>
+</html>
+
diff --git a/dom/broadcastchannel/tests/test_ordering.html b/dom/broadcastchannel/tests/test_ordering.html
new file mode 100644
index 0000000000..eab1f955e5
--- /dev/null
+++ b/dom/broadcastchannel/tests/test_ordering.html
@@ -0,0 +1,65 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for BroadcastChannel.postMessage invalid State</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<div id="content"></div>
+
+<script type="application/javascript">
+
+let c1 = new BroadcastChannel('order');
+let c2 = new BroadcastChannel('order');
+let c3 = new BroadcastChannel('order');
+
+let events = [];
+let doneCount = 0;
+
+function whichBC(bc) {
+  if (bc == c1) return "c1";
+  if (bc == c2) return "c2";
+  if (bc == c3) return "c3";
+  return "What?!?";
+}
+
+function handler(e) {
+  events.push(e);
+  if (e.data == 'done') {
+    doneCount++;
+    if (doneCount == 2) {
+      is(events.length, 6, "Correct length");
+      is(whichBC(events[0].target), "c2", 'target for event 0');
+      is(events[0].data, 'from c1');
+      is(whichBC(events[1].target), "c3", 'target for event 1');
+      is(events[1].data, 'from c1');
+      is(whichBC(events[2].target), "c1", 'target for event 2');
+      is(events[2].data, 'from c3');
+      is(whichBC(events[3].target), "c2", 'target for event 3');
+      is(events[3].data, 'from c3');
+      is(whichBC(events[4].target), "c1", 'target for event 4');
+      is(events[4].data, 'done');
+      is(whichBC(events[5].target), "c3", 'target for event 5');
+      is(events[5].data, 'done');
+
+      SimpleTest.finish();
+    }
+  }
+}
+
+c1.onmessage = handler;
+c2.onmessage = handler;
+c3.onmessage = handler;
+
+c1.postMessage('from c1');
+c3.postMessage('from c3');
+c2.postMessage('done');
+
+SimpleTest.waitForExplicitFinish();
+
+</script>
+</body>
+</html>
+