Add m-esr52 at 52.6.0

35 files changed, 5036 insertions, 0 deletions

diff --git a/dom/url/URL.cpp b/dom/url/URL.cpp
new file mode 100644
index 000000000..1f15e1151
--- /dev/null
+++ b/dom/url/URL.cpp
@@ -0,0 +1,1832 @@
+/* -*- 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 "URL.h"
+
+#include "DOMMediaStream.h"
+#include "mozilla/dom/File.h"
+#include "mozilla/dom/MediaSource.h"
+#include "mozilla/dom/URLBinding.h"
+#include "mozilla/dom/ipc/BlobChild.h"
+#include "mozilla/dom/ipc/nsIRemoteBlob.h"
+#include "mozilla/ipc/BackgroundChild.h"
+#include "nsContentUtils.h"
+#include "nsEscape.h"
+#include "nsHostObjectProtocolHandler.h"
+#include "nsIIOService.h"
+#include "nsIURIWithQuery.h"
+#include "nsIURL.h"
+#include "nsNetCID.h"
+#include "nsNetUtil.h"
+#include "nsServiceManagerUtils.h"
+#include "WorkerPrivate.h"
+#include "WorkerRunnable.h"
+#include "WorkerScope.h"
+
+namespace mozilla {
+namespace dom {
+
+///////////////////////////////////////////////////////////////////////////////
+// URL for main-thread
+///////////////////////////////////////////////////////////////////////////////
+
+namespace {
+
+template<typename T>
+void
+CreateObjectURLInternal(const GlobalObject& aGlobal, T aObject,
+                        nsAString& aResult, ErrorResult& aRv)
+{
+  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
+  if (NS_WARN_IF(!global)) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+
+  nsCOMPtr<nsIPrincipal> principal =
+    nsContentUtils::ObjectPrincipal(aGlobal.Get());
+
+  nsAutoCString url;
+  aRv = nsHostObjectProtocolHandler::AddDataEntry(aObject, principal, url);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  global->RegisterHostObjectURI(url);
+  CopyASCIItoUTF16(url, aResult);
+}
+
+// The URL implementation for the main-thread
+class URLMainThread final : public URL
+{
+public:
+  static already_AddRefed<URLMainThread>
+  Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+              URL& aBase, ErrorResult& aRv);
+
+  static already_AddRefed<URLMainThread>
+  Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+              const Optional<nsAString>& aBase, ErrorResult& aRv);
+
+  static already_AddRefed<URLMainThread>
+  Constructor(nsISupports* aParent, const nsAString& aURL,
+              const nsAString& aBase, ErrorResult& aRv);
+
+  static already_AddRefed<URLMainThread>
+  Constructor(nsISupports* aParent, const nsAString& aURL, nsIURI* aBase,
+              ErrorResult& aRv);
+
+  static void
+  CreateObjectURL(const GlobalObject& aGlobal, Blob& aBlob,
+                  const objectURLOptions& aOptions, nsAString& aResult,
+                  ErrorResult& aRv)
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+    CreateObjectURLInternal(aGlobal, aBlob.Impl(), aResult, aRv);
+  }
+
+  static void
+  CreateObjectURL(const GlobalObject& aGlobal, DOMMediaStream& aStream,
+                  const objectURLOptions& aOptions, nsAString& aResult,
+                  ErrorResult& aRv)
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+    CreateObjectURLInternal(aGlobal, &aStream, aResult, aRv);
+  }
+
+  static void
+  CreateObjectURL(const GlobalObject& aGlobal, MediaSource& aSource,
+                  const objectURLOptions& aOptions, nsAString& aResult,
+                  ErrorResult& aRv);
+
+  static void
+  RevokeObjectURL(const GlobalObject& aGlobal, const nsAString& aURL,
+                  ErrorResult& aRv);
+
+  static bool
+  IsValidURL(const GlobalObject& aGlobal, const nsAString& aURL,
+             ErrorResult& aRv);
+
+  URLMainThread(nsISupports* aParent, already_AddRefed<nsIURI> aURI)
+    : URL(aParent)
+    , mURI(aURI)
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+  }
+
+  virtual void
+  GetHref(nsAString& aHref, ErrorResult& aRv) const override;
+
+  virtual void
+  SetHref(const nsAString& aHref, ErrorResult& aRv) override;
+
+  virtual void
+  GetOrigin(nsAString& aOrigin, ErrorResult& aRv) const override;
+
+  virtual void
+  GetProtocol(nsAString& aProtocol, ErrorResult& aRv) const override;
+
+  virtual void
+  SetProtocol(const nsAString& aProtocol, ErrorResult& aRv) override;
+
+  virtual void
+  GetUsername(nsAString& aUsername, ErrorResult& aRv) const override;
+
+  virtual void
+  SetUsername(const nsAString& aUsername, ErrorResult& aRv) override;
+
+  virtual void
+  GetPassword(nsAString& aPassword, ErrorResult& aRv) const override;
+
+  virtual void
+  SetPassword(const nsAString& aPassword, ErrorResult& aRv) override;
+
+  virtual void
+  GetHost(nsAString& aHost, ErrorResult& aRv) const override;
+
+  virtual void
+  SetHost(const nsAString& aHost, ErrorResult& aRv) override;
+
+  virtual void
+  GetHostname(nsAString& aHostname, ErrorResult& aRv) const override;
+
+  virtual void
+  SetHostname(const nsAString& aHostname, ErrorResult& aRv) override;
+
+  virtual void
+  GetPort(nsAString& aPort, ErrorResult& aRv) const override;
+
+  virtual void
+  SetPort(const nsAString& aPort, ErrorResult& aRv) override;
+
+  virtual void
+  GetPathname(nsAString& aPathname, ErrorResult& aRv) const override;
+
+  virtual void
+  SetPathname(const nsAString& aPathname, ErrorResult& aRv) override;
+
+  virtual void
+  GetSearch(nsAString& aSearch, ErrorResult& aRv) const override;
+
+  virtual void
+  GetHash(nsAString& aHost, ErrorResult& aRv) const override;
+
+  virtual void
+  SetHash(const nsAString& aHash, ErrorResult& aRv) override;
+
+  virtual void UpdateURLSearchParams() override;
+
+  virtual void
+  SetSearchInternal(const nsAString& aSearch, ErrorResult& aRv) override;
+
+  nsIURI*
+  GetURI() const
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+    return mURI;
+  }
+
+private:
+  ~URLMainThread()
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+  }
+
+  nsCOMPtr<nsIURI> mURI;
+};
+
+/* static */ already_AddRefed<URLMainThread>
+URLMainThread::Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+                           URL& aBase, ErrorResult& aRv)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  URLMainThread& base = static_cast<URLMainThread&>(aBase);
+  return Constructor(aGlobal.GetAsSupports(), aURL, base.GetURI(), aRv);
+}
+
+/* static */ already_AddRefed<URLMainThread>
+URLMainThread::Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+                           const Optional<nsAString>& aBase, ErrorResult& aRv)
+{
+  if (aBase.WasPassed()) {
+    return Constructor(aGlobal.GetAsSupports(), aURL, aBase.Value(), aRv);
+  }
+
+  return Constructor(aGlobal.GetAsSupports(), aURL, nullptr, aRv);
+}
+
+/* static */ already_AddRefed<URLMainThread>
+URLMainThread::Constructor(nsISupports* aParent, const nsAString& aURL,
+                           const nsAString& aBase, ErrorResult& aRv)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIURI> baseUri;
+  nsresult rv = NS_NewURI(getter_AddRefs(baseUri), aBase, nullptr, nullptr,
+                          nsContentUtils::GetIOService());
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    aRv.ThrowTypeError<MSG_INVALID_URL>(aBase);
+    return nullptr;
+  }
+
+  return Constructor(aParent, aURL, baseUri, aRv);
+}
+
+/* static */ already_AddRefed<URLMainThread>
+URLMainThread::Constructor(nsISupports* aParent, const nsAString& aURL,
+                           nsIURI* aBase, ErrorResult& aRv)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIURI> uri;
+  nsresult rv = NS_NewURI(getter_AddRefs(uri), aURL, nullptr, aBase,
+                          nsContentUtils::GetIOService());
+  if (NS_FAILED(rv)) {
+    // No need to warn in this case. It's common to use the URL constructor
+    // to determine if a URL is valid and an exception will be propagated.
+    aRv.ThrowTypeError<MSG_INVALID_URL>(aURL);
+    return nullptr;
+  }
+
+  RefPtr<URLMainThread> url = new URLMainThread(aParent, uri.forget());
+  return url.forget();
+}
+
+/* static */ void
+URLMainThread::CreateObjectURL(const GlobalObject& aGlobal,
+                               MediaSource& aSource,
+                               const objectURLOptions& aOptions,
+                               nsAString& aResult, ErrorResult& aRv)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIPrincipal> principal =
+    nsContentUtils::ObjectPrincipal(aGlobal.Get());
+
+  nsAutoCString url;
+  aRv = nsHostObjectProtocolHandler::AddDataEntry(&aSource, principal, url);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  nsCOMPtr<nsIRunnable> revocation = NS_NewRunnableFunction(
+    [url] {
+      nsHostObjectProtocolHandler::RemoveDataEntry(url);
+    });
+
+  nsContentUtils::RunInStableState(revocation.forget());
+
+  CopyASCIItoUTF16(url, aResult);
+}
+
+/* static */ void
+URLMainThread::RevokeObjectURL(const GlobalObject& aGlobal,
+                               const nsAString& aURL, ErrorResult& aRv)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  nsCOMPtr<nsIGlobalObject> global = do_QueryInterface(aGlobal.GetAsSupports());
+  if (!global) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return;
+  }
+
+  nsIPrincipal* principal = nsContentUtils::ObjectPrincipal(aGlobal.Get());
+
+  NS_LossyConvertUTF16toASCII asciiurl(aURL);
+
+  nsIPrincipal* urlPrincipal =
+    nsHostObjectProtocolHandler::GetDataEntryPrincipal(asciiurl);
+
+  if (urlPrincipal && principal->Subsumes(urlPrincipal)) {
+    global->UnregisterHostObjectURI(asciiurl);
+    nsHostObjectProtocolHandler::RemoveDataEntry(asciiurl);
+  }
+}
+
+/* static */ bool
+URLMainThread::IsValidURL(const GlobalObject& aGlobal, const nsAString& aURL,
+                          ErrorResult& aRv)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  NS_LossyConvertUTF16toASCII asciiurl(aURL);
+  return nsHostObjectProtocolHandler::HasDataEntry(asciiurl);
+}
+
+void
+URLMainThread::GetHref(nsAString& aHref, ErrorResult& aRv) const
+{
+  aHref.Truncate();
+
+  nsAutoCString href;
+  nsresult rv = mURI->GetSpec(href);
+  if (NS_SUCCEEDED(rv)) {
+    CopyUTF8toUTF16(href, aHref);
+  }
+}
+
+void
+URLMainThread::SetHref(const nsAString& aHref, ErrorResult& aRv)
+{
+  NS_ConvertUTF16toUTF8 href(aHref);
+
+  nsresult rv;
+  nsCOMPtr<nsIIOService> ioService(do_GetService(NS_IOSERVICE_CONTRACTID, &rv));
+  if (NS_FAILED(rv)) {
+    aRv.Throw(rv);
+    return;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  rv = ioService->NewURI(href, nullptr, nullptr, getter_AddRefs(uri));
+  if (NS_FAILED(rv)) {
+    aRv.ThrowTypeError<MSG_INVALID_URL>(aHref);
+    return;
+  }
+
+  mURI = uri;
+  UpdateURLSearchParams();
+}
+
+void
+URLMainThread::GetOrigin(nsAString& aOrigin, ErrorResult& aRv) const
+{
+  nsContentUtils::GetUTFOrigin(mURI, aOrigin);
+}
+
+void
+URLMainThread::GetProtocol(nsAString& aProtocol, ErrorResult& aRv) const
+{
+  nsAutoCString protocol;
+  if (NS_SUCCEEDED(mURI->GetScheme(protocol))) {
+    aProtocol.Truncate();
+  }
+
+  CopyASCIItoUTF16(protocol, aProtocol);
+  aProtocol.Append(char16_t(':'));
+}
+
+void
+URLMainThread::SetProtocol(const nsAString& aProtocol, ErrorResult& aRv)
+{
+  nsAString::const_iterator start, end;
+  aProtocol.BeginReading(start);
+  aProtocol.EndReading(end);
+  nsAString::const_iterator iter(start);
+
+  FindCharInReadable(':', iter, end);
+
+  // Changing the protocol of a URL, changes the "nature" of the URI
+  // implementation. In order to do this properly, we have to serialize the
+  // existing URL and reparse it in a new object.
+  nsCOMPtr<nsIURI> clone;
+  nsresult rv = mURI->Clone(getter_AddRefs(clone));
+  if (NS_WARN_IF(NS_FAILED(rv)) || !clone) {
+    return;
+  }
+
+  rv = clone->SetScheme(NS_ConvertUTF16toUTF8(Substring(start, iter)));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  nsAutoCString href;
+  rv = clone->GetSpec(href);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  nsCOMPtr<nsIURI> uri;
+  rv = NS_NewURI(getter_AddRefs(uri), href);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  mURI = uri;
+}
+
+#define URL_GETTER( value, func ) \
+  value.Truncate();               \
+  nsAutoCString tmp;              \
+  nsresult rv = mURI->func(tmp);  \
+  if (NS_SUCCEEDED(rv)) {         \
+    CopyUTF8toUTF16(tmp, value);  \
+  }
+
+void
+URLMainThread::GetUsername(nsAString& aUsername, ErrorResult& aRv) const
+{
+  URL_GETTER(aUsername, GetUsername);
+}
+
+void
+URLMainThread::SetUsername(const nsAString& aUsername, ErrorResult& aRv)
+{
+  mURI->SetUsername(NS_ConvertUTF16toUTF8(aUsername));
+}
+
+void
+URLMainThread::GetPassword(nsAString& aPassword, ErrorResult& aRv) const
+{
+  URL_GETTER(aPassword, GetPassword);
+}
+
+void
+URLMainThread::SetPassword(const nsAString& aPassword, ErrorResult& aRv)
+{
+  mURI->SetPassword(NS_ConvertUTF16toUTF8(aPassword));
+}
+
+void
+URLMainThread::GetHost(nsAString& aHost, ErrorResult& aRv) const
+{
+  URL_GETTER(aHost, GetHostPort);
+}
+
+void
+URLMainThread::SetHost(const nsAString& aHost, ErrorResult& aRv)
+{
+  mURI->SetHostPort(NS_ConvertUTF16toUTF8(aHost));
+}
+
+void
+URLMainThread::UpdateURLSearchParams()
+{
+  if (!mSearchParams) {
+    return;
+  }
+
+  nsAutoCString search;
+  nsCOMPtr<nsIURL> url(do_QueryInterface(mURI));
+  if (url) {
+    nsresult rv = url->GetQuery(search);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      search.Truncate();
+    }
+  }
+
+  mSearchParams->ParseInput(search);
+}
+
+void
+URLMainThread::GetHostname(nsAString& aHostname, ErrorResult& aRv) const
+{
+  aHostname.Truncate();
+  nsContentUtils::GetHostOrIPv6WithBrackets(mURI, aHostname);
+}
+
+void
+URLMainThread::SetHostname(const nsAString& aHostname, ErrorResult& aRv)
+{
+  // nsStandardURL returns NS_ERROR_UNEXPECTED for an empty hostname
+  // The return code is silently ignored
+  mURI->SetHost(NS_ConvertUTF16toUTF8(aHostname));
+}
+
+void
+URLMainThread::GetPort(nsAString& aPort, ErrorResult& aRv) const
+{
+  aPort.Truncate();
+
+  int32_t port;
+  nsresult rv = mURI->GetPort(&port);
+  if (NS_SUCCEEDED(rv) && port != -1) {
+    nsAutoString portStr;
+    portStr.AppendInt(port, 10);
+    aPort.Assign(portStr);
+  }
+}
+
+void
+URLMainThread::SetPort(const nsAString& aPort, ErrorResult& aRv)
+{
+  nsresult rv;
+  nsAutoString portStr(aPort);
+  int32_t port = -1;
+
+  // nsIURI uses -1 as default value.
+  if (!portStr.IsEmpty()) {
+    port = portStr.ToInteger(&rv);
+    if (NS_FAILED(rv)) {
+      return;
+    }
+  }
+
+  mURI->SetPort(port);
+}
+
+void
+URLMainThread::GetPathname(nsAString& aPathname, ErrorResult& aRv) const
+{
+  aPathname.Truncate();
+
+  // Do not throw!  Not having a valid URI or URL should result in an empty
+  // string.
+
+  nsCOMPtr<nsIURIWithQuery> url(do_QueryInterface(mURI));
+  if (url) {
+    nsAutoCString file;
+    nsresult rv = url->GetFilePath(file);
+    if (NS_SUCCEEDED(rv)) {
+      CopyUTF8toUTF16(file, aPathname);
+    }
+
+    return;
+  }
+
+  nsAutoCString path;
+  nsresult rv = mURI->GetPath(path);
+  if (NS_SUCCEEDED(rv)) {
+    CopyUTF8toUTF16(path, aPathname);
+  }
+}
+
+void
+URLMainThread::SetPathname(const nsAString& aPathname, ErrorResult& aRv)
+{
+  // Do not throw!
+
+  nsCOMPtr<nsIURIWithQuery> url(do_QueryInterface(mURI));
+  if (url) {
+    url->SetFilePath(NS_ConvertUTF16toUTF8(aPathname));
+    return;
+  }
+}
+
+void
+URLMainThread::GetSearch(nsAString& aSearch, ErrorResult& aRv) const
+{
+  aSearch.Truncate();
+
+  // Do not throw!  Not having a valid URI or URL should result in an empty
+  // string.
+
+  nsAutoCString search;
+  nsresult rv;
+
+  nsCOMPtr<nsIURIWithQuery> url(do_QueryInterface(mURI));
+  if (url) {
+    rv = url->GetQuery(search);
+    if (NS_SUCCEEDED(rv) && !search.IsEmpty()) {
+      CopyUTF8toUTF16(NS_LITERAL_CSTRING("?") + search, aSearch);
+    }
+    return;
+  }
+}
+
+void
+URLMainThread::GetHash(nsAString& aHash, ErrorResult& aRv) const
+{
+  aHash.Truncate();
+
+  nsAutoCString ref;
+  nsresult rv = mURI->GetRef(ref);
+  if (NS_SUCCEEDED(rv) && !ref.IsEmpty()) {
+    aHash.Assign(char16_t('#'));
+    if (nsContentUtils::GettersDecodeURLHash()) {
+      NS_UnescapeURL(ref); // XXX may result in random non-ASCII bytes!
+    }
+    AppendUTF8toUTF16(ref, aHash);
+  }
+}
+
+void
+URLMainThread::SetHash(const nsAString& aHash, ErrorResult& aRv)
+{
+  mURI->SetRef(NS_ConvertUTF16toUTF8(aHash));
+}
+
+void
+URLMainThread::SetSearchInternal(const nsAString& aSearch, ErrorResult& aRv)
+{
+  // Ignore failures to be compatible with NS4.
+
+  nsCOMPtr<nsIURIWithQuery> uriWithQuery(do_QueryInterface(mURI));
+  if (uriWithQuery) {
+    uriWithQuery->SetQuery(NS_ConvertUTF16toUTF8(aSearch));
+    return;
+  }
+}
+
+} // anonymous namespace
+
+///////////////////////////////////////////////////////////////////////////////
+// URL for Workers
+///////////////////////////////////////////////////////////////////////////////
+
+namespace {
+
+using namespace workers;
+
+// Proxy class to forward all the requests to a URLMainThread object.
+class URLProxy final
+{
+public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(URLProxy)
+
+  explicit URLProxy(already_AddRefed<URLMainThread> aURL)
+    : mURL(aURL)
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+  }
+
+  URLMainThread* URL()
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+    return mURL;
+  }
+
+  nsIURI* URI()
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+    return mURL->GetURI();
+  }
+
+  void ReleaseURI()
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+    mURL = nullptr;
+  }
+
+private:
+  // Private destructor, to discourage deletion outside of Release():
+  ~URLProxy()
+  {
+     MOZ_ASSERT(!mURL);
+  }
+
+  RefPtr<URLMainThread> mURL;
+};
+
+// URLWorker implements the URL object in workers.
+class URLWorker final : public URL
+{
+public:
+  static already_AddRefed<URLWorker>
+  Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+              URL& aBase, ErrorResult& aRv);
+
+  static already_AddRefed<URLWorker>
+  Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+              const Optional<nsAString>& aBase, ErrorResult& aRv);
+
+  static already_AddRefed<URLWorker>
+  Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+              const nsAString& aBase, ErrorResult& aRv);
+
+  static void
+  CreateObjectURL(const GlobalObject& aGlobal, Blob& aBlob,
+                  const mozilla::dom::objectURLOptions& aOptions,
+                  nsAString& aResult, mozilla::ErrorResult& aRv);
+
+  static void
+  RevokeObjectURL(const GlobalObject& aGlobal, const nsAString& aUrl,
+                  ErrorResult& aRv);
+
+  static bool
+  IsValidURL(const GlobalObject& aGlobal, const nsAString& aUrl,
+             ErrorResult& aRv);
+
+  URLWorker(WorkerPrivate* aWorkerPrivate, URLProxy* aURLProxy);
+
+  virtual void
+  GetHref(nsAString& aHref, ErrorResult& aRv) const override;
+
+  virtual void
+  SetHref(const nsAString& aHref, ErrorResult& aRv) override;
+
+  virtual void
+  GetOrigin(nsAString& aOrigin, ErrorResult& aRv) const override;
+
+  virtual void
+  GetProtocol(nsAString& aProtocol, ErrorResult& aRv) const override;
+
+  virtual void
+  SetProtocol(const nsAString& aProtocol, ErrorResult& aRv) override;
+
+  virtual void
+  GetUsername(nsAString& aUsername, ErrorResult& aRv) const override;
+
+  virtual void
+  SetUsername(const nsAString& aUsername, ErrorResult& aRv) override;
+
+  virtual void
+  GetPassword(nsAString& aPassword, ErrorResult& aRv) const override;
+
+  virtual void
+  SetPassword(const nsAString& aPassword, ErrorResult& aRv) override;
+
+  virtual void
+  GetHost(nsAString& aHost, ErrorResult& aRv) const override;
+
+  virtual void
+  SetHost(const nsAString& aHost, ErrorResult& aRv) override;
+
+  virtual void
+  GetHostname(nsAString& aHostname, ErrorResult& aRv) const override;
+
+  virtual void
+  SetHostname(const nsAString& aHostname, ErrorResult& aRv) override;
+
+  virtual void
+  GetPort(nsAString& aPort, ErrorResult& aRv) const override;
+
+  virtual void
+  SetPort(const nsAString& aPort, ErrorResult& aRv) override;
+
+  virtual void
+  GetPathname(nsAString& aPathname, ErrorResult& aRv) const override;
+
+  virtual void
+  SetPathname(const nsAString& aPathname, ErrorResult& aRv) override;
+
+  virtual void
+  GetSearch(nsAString& aSearch, ErrorResult& aRv) const override;
+
+  virtual void
+  GetHash(nsAString& aHost, ErrorResult& aRv) const override;
+
+  virtual void
+  SetHash(const nsAString& aHash, ErrorResult& aRv) override;
+
+  virtual void UpdateURLSearchParams() override;
+
+  virtual void
+  SetSearchInternal(const nsAString& aSearch, ErrorResult& aRv) override;
+
+  URLProxy*
+  GetURLProxy() const
+  {
+    mWorkerPrivate->AssertIsOnWorkerThread();
+    return mURLProxy;
+  }
+
+private:
+  ~URLWorker();
+
+  workers::WorkerPrivate* mWorkerPrivate;
+  RefPtr<URLProxy> mURLProxy;
+};
+
+// This class creates an URL from a DOM Blob on the main thread.
+class CreateURLRunnable : public WorkerMainThreadRunnable
+{
+private:
+  BlobImpl* mBlobImpl;
+  nsAString& mURL;
+
+public:
+  CreateURLRunnable(WorkerPrivate* aWorkerPrivate, BlobImpl* aBlobImpl,
+                    const objectURLOptions& aOptions,
+                    nsAString& aURL)
+  : WorkerMainThreadRunnable(aWorkerPrivate,
+                             NS_LITERAL_CSTRING("URL :: CreateURL"))
+  , mBlobImpl(aBlobImpl)
+  , mURL(aURL)
+  {
+    MOZ_ASSERT(aBlobImpl);
+
+    DebugOnly<bool> isMutable;
+    MOZ_ASSERT(NS_SUCCEEDED(aBlobImpl->GetMutable(&isMutable)));
+    MOZ_ASSERT(!isMutable);
+  }
+
+  bool
+  MainThreadRun()
+  {
+    using namespace mozilla::ipc;
+
+    AssertIsOnMainThread();
+
+    RefPtr<BlobImpl> newBlobImplHolder;
+
+    if (nsCOMPtr<nsIRemoteBlob> remoteBlob = do_QueryInterface(mBlobImpl)) {
+      if (BlobChild* blobChild = remoteBlob->GetBlobChild()) {
+        if (PBackgroundChild* blobManager = blobChild->GetBackgroundManager()) {
+          PBackgroundChild* backgroundManager =
+            BackgroundChild::GetForCurrentThread();
+          MOZ_ASSERT(backgroundManager);
+
+          if (blobManager != backgroundManager) {
+            // Always make sure we have a blob from an actor we can use on this
+            // thread.
+            blobChild = BlobChild::GetOrCreate(backgroundManager, mBlobImpl);
+            MOZ_ASSERT(blobChild);
+
+            newBlobImplHolder = blobChild->GetBlobImpl();
+            MOZ_ASSERT(newBlobImplHolder);
+
+            mBlobImpl = newBlobImplHolder;
+          }
+        }
+      }
+    }
+
+    DebugOnly<bool> isMutable;
+    MOZ_ASSERT(NS_SUCCEEDED(mBlobImpl->GetMutable(&isMutable)));
+    MOZ_ASSERT(!isMutable);
+
+    nsCOMPtr<nsIPrincipal> principal = mWorkerPrivate->GetPrincipal();
+
+    nsAutoCString url;
+    nsresult rv =
+      nsHostObjectProtocolHandler::AddDataEntry(mBlobImpl, principal, url);
+
+    if (NS_FAILED(rv)) {
+      NS_WARNING("Failed to add data entry for the blob!");
+      SetDOMStringToNull(mURL);
+      return false;
+    }
+
+    if (!mWorkerPrivate->IsSharedWorker() &&
+        !mWorkerPrivate->IsServiceWorker()) {
+      // Walk up to top worker object.
+      WorkerPrivate* wp = mWorkerPrivate;
+      while (WorkerPrivate* parent = wp->GetParent()) {
+        wp = parent;
+      }
+
+      nsCOMPtr<nsIScriptContext> sc = wp->GetScriptContext();
+      // We could not have a ScriptContext in JSM code. In this case, we leak.
+      if (sc) {
+        nsCOMPtr<nsIGlobalObject> global = sc->GetGlobalObject();
+        MOZ_ASSERT(global);
+
+        global->RegisterHostObjectURI(url);
+      }
+    }
+
+    mURL = NS_ConvertUTF8toUTF16(url);
+    return true;
+  }
+};
+
+// This class revokes an URL on the main thread.
+class RevokeURLRunnable : public WorkerMainThreadRunnable
+{
+private:
+  const nsString mURL;
+
+public:
+  RevokeURLRunnable(WorkerPrivate* aWorkerPrivate,
+                    const nsAString& aURL)
+  : WorkerMainThreadRunnable(aWorkerPrivate,
+                             NS_LITERAL_CSTRING("URL :: RevokeURL"))
+  , mURL(aURL)
+  {}
+
+  bool
+  MainThreadRun()
+  {
+    AssertIsOnMainThread();
+
+    NS_ConvertUTF16toUTF8 url(mURL);
+
+    nsIPrincipal* urlPrincipal =
+      nsHostObjectProtocolHandler::GetDataEntryPrincipal(url);
+
+    nsCOMPtr<nsIPrincipal> principal = mWorkerPrivate->GetPrincipal();
+
+    bool subsumes;
+    if (urlPrincipal &&
+        NS_SUCCEEDED(principal->Subsumes(urlPrincipal, &subsumes)) &&
+        subsumes) {
+      nsHostObjectProtocolHandler::RemoveDataEntry(url);
+    }
+
+    if (!mWorkerPrivate->IsSharedWorker() &&
+        !mWorkerPrivate->IsServiceWorker()) {
+      // Walk up to top worker object.
+      WorkerPrivate* wp = mWorkerPrivate;
+      while (WorkerPrivate* parent = wp->GetParent()) {
+        wp = parent;
+      }
+
+      nsCOMPtr<nsIScriptContext> sc = wp->GetScriptContext();
+      // We could not have a ScriptContext in JSM code. In this case, we leak.
+      if (sc) {
+        nsCOMPtr<nsIGlobalObject> global = sc->GetGlobalObject();
+        MOZ_ASSERT(global);
+
+        global->UnregisterHostObjectURI(url);
+      }
+    }
+
+    return true;
+  }
+};
+
+// This class checks if an URL is valid on the main thread.
+class IsValidURLRunnable : public WorkerMainThreadRunnable
+{
+private:
+  const nsString mURL;
+  bool mValid;
+
+public:
+  IsValidURLRunnable(WorkerPrivate* aWorkerPrivate,
+                     const nsAString& aURL)
+  : WorkerMainThreadRunnable(aWorkerPrivate,
+                             NS_LITERAL_CSTRING("URL :: IsValidURL"))
+  , mURL(aURL)
+  , mValid(false)
+  {}
+
+  bool
+  MainThreadRun()
+  {
+    AssertIsOnMainThread();
+
+    NS_ConvertUTF16toUTF8 url(mURL);
+    mValid = nsHostObjectProtocolHandler::HasDataEntry(url);
+
+    return true;
+  }
+
+  bool
+  IsValidURL() const
+  {
+    return mValid;
+  }
+};
+
+// This class creates a URL object on the main thread.
+class ConstructorRunnable : public WorkerMainThreadRunnable
+{
+private:
+  const nsString mURL;
+
+  nsString mBase; // IsVoid() if we have no base URI string.
+  RefPtr<URLProxy> mBaseProxy;
+
+  RefPtr<URLProxy> mRetval;
+
+public:
+  ConstructorRunnable(WorkerPrivate* aWorkerPrivate,
+                      const nsAString& aURL, const Optional<nsAString>& aBase)
+  : WorkerMainThreadRunnable(aWorkerPrivate,
+                             NS_LITERAL_CSTRING("URL :: Constructor"))
+  , mURL(aURL)
+  {
+    if (aBase.WasPassed()) {
+      mBase = aBase.Value();
+    } else {
+      mBase.SetIsVoid(true);
+    }
+    mWorkerPrivate->AssertIsOnWorkerThread();
+  }
+
+  ConstructorRunnable(WorkerPrivate* aWorkerPrivate,
+                      const nsAString& aURL, URLProxy* aBaseProxy)
+  : WorkerMainThreadRunnable(aWorkerPrivate,
+                             NS_LITERAL_CSTRING("URL :: Constructor with BaseURL"))
+  , mURL(aURL)
+  , mBaseProxy(aBaseProxy)
+  {
+    mBase.SetIsVoid(true);
+    mWorkerPrivate->AssertIsOnWorkerThread();
+  }
+
+  bool
+  MainThreadRun()
+  {
+    AssertIsOnMainThread();
+
+    ErrorResult rv;
+    RefPtr<URLMainThread> url;
+    if (mBaseProxy) {
+      url = URLMainThread::Constructor(nullptr, mURL, mBaseProxy->URI(), rv);
+    } else if (!mBase.IsVoid()) {
+      url = URLMainThread::Constructor(nullptr, mURL, mBase, rv);
+    } else {
+      url = URLMainThread::Constructor(nullptr, mURL, nullptr, rv);
+    }
+
+    if (rv.Failed()) {
+      rv.SuppressException();
+      return true;
+    }
+
+    mRetval = new URLProxy(url.forget());
+    return true;
+  }
+
+  URLProxy*
+  GetURLProxy(ErrorResult& aRv) const
+  {
+    MOZ_ASSERT(mWorkerPrivate);
+    mWorkerPrivate->AssertIsOnWorkerThread();
+
+    if (!mRetval) {
+      aRv.ThrowTypeError<MSG_INVALID_URL>(mURL);
+    }
+
+    return mRetval;
+  }
+};
+
+class TeardownURLRunnable : public Runnable
+{
+public:
+  explicit TeardownURLRunnable(URLProxy* aURLProxy)
+    : mURLProxy(aURLProxy)
+  {
+  }
+
+  NS_IMETHOD Run()
+  {
+    AssertIsOnMainThread();
+
+    mURLProxy->ReleaseURI();
+    mURLProxy = nullptr;
+
+    return NS_OK;
+  }
+
+private:
+  RefPtr<URLProxy> mURLProxy;
+};
+
+// This class is the generic getter for any URL property.
+class GetterRunnable : public WorkerMainThreadRunnable
+{
+public:
+  enum GetterType {
+    GetterHref,
+    GetterOrigin,
+    GetterProtocol,
+    GetterUsername,
+    GetterPassword,
+    GetterHost,
+    GetterHostname,
+    GetterPort,
+    GetterPathname,
+    GetterSearch,
+    GetterHash,
+  };
+
+  GetterRunnable(WorkerPrivate* aWorkerPrivate,
+                 GetterType aType, nsAString& aValue,
+                 URLProxy* aURLProxy)
+  : WorkerMainThreadRunnable(aWorkerPrivate,
+                             // We can have telemetry keys for each getter when
+                             // needed.
+                             NS_LITERAL_CSTRING("URL :: getter"))
+  , mValue(aValue)
+  , mType(aType)
+  , mURLProxy(aURLProxy)
+  {
+    mWorkerPrivate->AssertIsOnWorkerThread();
+  }
+
+  bool
+  MainThreadRun()
+  {
+    AssertIsOnMainThread();
+    ErrorResult rv;
+
+    switch (mType) {
+      case GetterHref:
+        mURLProxy->URL()->GetHref(mValue, rv);
+        break;
+
+      case GetterOrigin:
+        mURLProxy->URL()->GetOrigin(mValue, rv);
+        break;
+
+      case GetterProtocol:
+        mURLProxy->URL()->GetProtocol(mValue, rv);
+        break;
+
+      case GetterUsername:
+        mURLProxy->URL()->GetUsername(mValue, rv);
+        break;
+
+      case GetterPassword:
+        mURLProxy->URL()->GetPassword(mValue, rv);
+        break;
+
+      case GetterHost:
+        mURLProxy->URL()->GetHost(mValue, rv);
+        break;
+
+      case GetterHostname:
+        mURLProxy->URL()->GetHostname(mValue, rv);
+        break;
+
+      case GetterPort:
+        mURLProxy->URL()->GetPort(mValue, rv);
+        break;
+
+      case GetterPathname:
+        mURLProxy->URL()->GetPathname(mValue, rv);
+        break;
+
+      case GetterSearch:
+        mURLProxy->URL()->GetSearch(mValue, rv);
+        break;
+
+      case GetterHash:
+        mURLProxy->URL()->GetHash(mValue, rv);
+        break;
+    }
+
+    MOZ_ASSERT(!rv.Failed(), "Main-thread getters do not fail.");
+    return true;
+  }
+
+private:
+  nsAString& mValue;
+  GetterType mType;
+  RefPtr<URLProxy> mURLProxy;
+};
+
+// This class is the generic setter for any URL property.
+class SetterRunnable : public WorkerMainThreadRunnable
+{
+public:
+  enum SetterType {
+    SetterHref,
+    SetterProtocol,
+    SetterUsername,
+    SetterPassword,
+    SetterHost,
+    SetterHostname,
+    SetterPort,
+    SetterPathname,
+    SetterSearch,
+    SetterHash,
+  };
+
+  SetterRunnable(WorkerPrivate* aWorkerPrivate,
+                 SetterType aType, const nsAString& aValue,
+                 URLProxy* aURLProxy)
+  : WorkerMainThreadRunnable(aWorkerPrivate,
+                             // We can have telemetry keys for each setter when
+                             // needed.
+                             NS_LITERAL_CSTRING("URL :: setter"))
+  , mValue(aValue)
+  , mType(aType)
+  , mURLProxy(aURLProxy)
+  , mFailed(false)
+  {
+    mWorkerPrivate->AssertIsOnWorkerThread();
+  }
+
+  bool
+  MainThreadRun()
+  {
+    AssertIsOnMainThread();
+    ErrorResult rv;
+
+    switch (mType) {
+      case SetterHref: {
+        mURLProxy->URL()->SetHref(mValue, rv);
+        break;
+      }
+
+      case SetterProtocol:
+        mURLProxy->URL()->SetProtocol(mValue, rv);
+        break;
+
+      case SetterUsername:
+        mURLProxy->URL()->SetUsername(mValue, rv);
+        break;
+
+      case SetterPassword:
+        mURLProxy->URL()->SetPassword(mValue, rv);
+        break;
+
+      case SetterHost:
+        mURLProxy->URL()->SetHost(mValue, rv);
+        break;
+
+      case SetterHostname:
+        mURLProxy->URL()->SetHostname(mValue, rv);
+        break;
+
+      case SetterPort:
+        mURLProxy->URL()->SetPort(mValue, rv);
+        break;
+
+      case SetterPathname:
+        mURLProxy->URL()->SetPathname(mValue, rv);
+        break;
+
+      case SetterSearch:
+        mURLProxy->URL()->SetSearch(mValue, rv);
+        break;
+
+      case SetterHash:
+        mURLProxy->URL()->SetHash(mValue, rv);
+        break;
+    }
+
+    if (NS_WARN_IF(rv.Failed())) {
+      rv.SuppressException();
+      mFailed = true;
+    }
+
+    return true;
+  }
+
+  bool Failed() const
+  {
+    return mFailed;
+  }
+
+private:
+  const nsString mValue;
+  SetterType mType;
+  RefPtr<URLProxy> mURLProxy;
+  bool mFailed;
+};
+
+already_AddRefed<URLWorker>
+FinishConstructor(JSContext* aCx, WorkerPrivate* aPrivate,
+                  ConstructorRunnable* aRunnable, ErrorResult& aRv)
+{
+  aRunnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  RefPtr<URLProxy> proxy = aRunnable->GetURLProxy(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  RefPtr<URLWorker> url = new URLWorker(aPrivate, proxy);
+  return url.forget();
+}
+
+/* static */ already_AddRefed<URLWorker>
+URLWorker::Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+                       URL& aBase, ErrorResult& aRv)
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  JSContext* cx = aGlobal.Context();
+  WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
+
+  URLWorker& base = static_cast<URLWorker&>(aBase);
+  RefPtr<ConstructorRunnable> runnable =
+    new ConstructorRunnable(workerPrivate, aURL, base.GetURLProxy());
+
+  return FinishConstructor(cx, workerPrivate, runnable, aRv);
+}
+
+/* static */ already_AddRefed<URLWorker>
+URLWorker::Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+                       const Optional<nsAString>& aBase, ErrorResult& aRv)
+{
+  JSContext* cx = aGlobal.Context();
+  WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
+
+  RefPtr<ConstructorRunnable> runnable =
+    new ConstructorRunnable(workerPrivate, aURL, aBase);
+
+  return FinishConstructor(cx, workerPrivate, runnable, aRv);
+}
+
+/* static */ already_AddRefed<URLWorker>
+URLWorker::Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+                       const nsAString& aBase, ErrorResult& aRv)
+{
+  JSContext* cx = aGlobal.Context();
+  WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
+
+  Optional<nsAString> base;
+  base = &aBase;
+
+  RefPtr<ConstructorRunnable> runnable =
+    new ConstructorRunnable(workerPrivate, aURL, base);
+
+  return FinishConstructor(cx, workerPrivate, runnable, aRv);
+}
+
+/* static */ void
+URLWorker::CreateObjectURL(const GlobalObject& aGlobal, Blob& aBlob,
+                           const mozilla::dom::objectURLOptions& aOptions,
+                           nsAString& aResult, mozilla::ErrorResult& aRv)
+{
+  JSContext* cx = aGlobal.Context();
+  WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
+
+  RefPtr<BlobImpl> blobImpl = aBlob.Impl();
+  MOZ_ASSERT(blobImpl);
+
+  aRv = blobImpl->SetMutable(false);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  RefPtr<CreateURLRunnable> runnable =
+    new CreateURLRunnable(workerPrivate, blobImpl, aOptions, aResult);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  if (workerPrivate->IsSharedWorker() || workerPrivate->IsServiceWorker()) {
+    WorkerGlobalScope* scope = workerPrivate->GlobalScope();
+    MOZ_ASSERT(scope);
+
+    scope->RegisterHostObjectURI(NS_ConvertUTF16toUTF8(aResult));
+  }
+}
+
+/* static */ void
+URLWorker::RevokeObjectURL(const GlobalObject& aGlobal, const nsAString& aUrl,
+                           ErrorResult& aRv)
+{
+  JSContext* cx = aGlobal.Context();
+  WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
+
+  RefPtr<RevokeURLRunnable> runnable =
+    new RevokeURLRunnable(workerPrivate, aUrl);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  if (workerPrivate->IsSharedWorker() || workerPrivate->IsServiceWorker()) {
+    WorkerGlobalScope* scope = workerPrivate->GlobalScope();
+    MOZ_ASSERT(scope);
+
+    scope->UnregisterHostObjectURI(NS_ConvertUTF16toUTF8(aUrl));
+  }
+}
+
+/* static */ bool
+URLWorker::IsValidURL(const GlobalObject& aGlobal, const nsAString& aUrl,
+                      ErrorResult& aRv)
+{
+  JSContext* cx = aGlobal.Context();
+  WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(cx);
+
+  RefPtr<IsValidURLRunnable> runnable =
+    new IsValidURLRunnable(workerPrivate, aUrl);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return false;
+  }
+
+  return runnable->IsValidURL();
+}
+
+URLWorker::URLWorker(WorkerPrivate* aWorkerPrivate, URLProxy* aURLProxy)
+  : URL(nullptr)
+  , mWorkerPrivate(aWorkerPrivate)
+  , mURLProxy(aURLProxy)
+{}
+
+URLWorker::~URLWorker()
+{
+  if (mURLProxy) {
+    mWorkerPrivate->AssertIsOnWorkerThread();
+
+    RefPtr<TeardownURLRunnable> runnable =
+      new TeardownURLRunnable(mURLProxy);
+    mURLProxy = nullptr;
+
+    if (NS_FAILED(NS_DispatchToMainThread(runnable))) {
+      NS_ERROR("Failed to dispatch teardown runnable!");
+    }
+  }
+}
+
+void
+URLWorker::GetHref(nsAString& aHref, ErrorResult& aRv) const
+{
+  RefPtr<GetterRunnable> runnable =
+    new GetterRunnable(mWorkerPrivate, GetterRunnable::GetterHref, aHref,
+                       mURLProxy);
+
+  runnable->Dispatch(aRv);
+}
+
+void
+URLWorker::SetHref(const nsAString& aHref, ErrorResult& aRv)
+{
+  RefPtr<SetterRunnable> runnable =
+    new SetterRunnable(mWorkerPrivate, SetterRunnable::SetterHref, aHref,
+                       mURLProxy);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  if (runnable->Failed()) {
+    aRv.ThrowTypeError<MSG_INVALID_URL>(aHref);
+    return;
+  }
+
+  UpdateURLSearchParams();
+}
+
+void
+URLWorker::GetOrigin(nsAString& aOrigin, ErrorResult& aRv) const
+{
+  RefPtr<GetterRunnable> runnable =
+    new GetterRunnable(mWorkerPrivate, GetterRunnable::GetterOrigin, aOrigin,
+                       mURLProxy);
+
+  runnable->Dispatch(aRv);
+}
+
+void
+URLWorker::GetProtocol(nsAString& aProtocol, ErrorResult& aRv) const
+{
+  RefPtr<GetterRunnable> runnable =
+    new GetterRunnable(mWorkerPrivate, GetterRunnable::GetterProtocol, aProtocol,
+                       mURLProxy);
+
+  runnable->Dispatch(aRv);
+}
+
+void
+URLWorker::SetProtocol(const nsAString& aProtocol, ErrorResult& aRv)
+{
+  RefPtr<SetterRunnable> runnable =
+    new SetterRunnable(mWorkerPrivate, SetterRunnable::SetterProtocol,
+                       aProtocol, mURLProxy);
+
+  runnable->Dispatch(aRv);
+
+  MOZ_ASSERT(!runnable->Failed());
+}
+
+void
+URLWorker::GetUsername(nsAString& aUsername, ErrorResult& aRv) const
+{
+  RefPtr<GetterRunnable> runnable =
+    new GetterRunnable(mWorkerPrivate, GetterRunnable::GetterUsername, aUsername,
+                       mURLProxy);
+
+  runnable->Dispatch(aRv);
+}
+
+void
+URLWorker::SetUsername(const nsAString& aUsername, ErrorResult& aRv)
+{
+  RefPtr<SetterRunnable> runnable =
+    new SetterRunnable(mWorkerPrivate, SetterRunnable::SetterUsername,
+                       aUsername, mURLProxy);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  MOZ_ASSERT(!runnable->Failed());
+}
+
+void
+URLWorker::GetPassword(nsAString& aPassword, ErrorResult& aRv) const
+{
+  RefPtr<GetterRunnable> runnable =
+    new GetterRunnable(mWorkerPrivate, GetterRunnable::GetterPassword, aPassword,
+                       mURLProxy);
+
+  runnable->Dispatch(aRv);
+}
+
+void
+URLWorker::SetPassword(const nsAString& aPassword, ErrorResult& aRv)
+{
+  RefPtr<SetterRunnable> runnable =
+    new SetterRunnable(mWorkerPrivate, SetterRunnable::SetterPassword,
+                       aPassword, mURLProxy);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  MOZ_ASSERT(!runnable->Failed());
+}
+
+void
+URLWorker::GetHost(nsAString& aHost, ErrorResult& aRv) const
+{
+  RefPtr<GetterRunnable> runnable =
+    new GetterRunnable(mWorkerPrivate, GetterRunnable::GetterHost, aHost,
+                       mURLProxy);
+
+  runnable->Dispatch(aRv);
+}
+
+void
+URLWorker::SetHost(const nsAString& aHost, ErrorResult& aRv)
+{
+  RefPtr<SetterRunnable> runnable =
+    new SetterRunnable(mWorkerPrivate, SetterRunnable::SetterHost,
+                       aHost, mURLProxy);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  MOZ_ASSERT(!runnable->Failed());
+}
+
+void
+URLWorker::GetHostname(nsAString& aHostname, ErrorResult& aRv) const
+{
+  RefPtr<GetterRunnable> runnable =
+    new GetterRunnable(mWorkerPrivate, GetterRunnable::GetterHostname, aHostname,
+                       mURLProxy);
+
+  runnable->Dispatch(aRv);
+}
+
+void
+URLWorker::SetHostname(const nsAString& aHostname, ErrorResult& aRv)
+{
+  RefPtr<SetterRunnable> runnable =
+    new SetterRunnable(mWorkerPrivate, SetterRunnable::SetterHostname,
+                       aHostname, mURLProxy);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  MOZ_ASSERT(!runnable->Failed());
+}
+
+void
+URLWorker::GetPort(nsAString& aPort, ErrorResult& aRv) const
+{
+  RefPtr<GetterRunnable> runnable =
+    new GetterRunnable(mWorkerPrivate, GetterRunnable::GetterPort, aPort,
+                       mURLProxy);
+
+  runnable->Dispatch(aRv);
+}
+
+void
+URLWorker::SetPort(const nsAString& aPort, ErrorResult& aRv)
+{
+  RefPtr<SetterRunnable> runnable =
+    new SetterRunnable(mWorkerPrivate, SetterRunnable::SetterPort,
+                       aPort, mURLProxy);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  MOZ_ASSERT(!runnable->Failed());
+}
+
+void
+URLWorker::GetPathname(nsAString& aPathname, ErrorResult& aRv) const
+{
+  RefPtr<GetterRunnable> runnable =
+    new GetterRunnable(mWorkerPrivate, GetterRunnable::GetterPathname,
+                       aPathname, mURLProxy);
+
+  runnable->Dispatch(aRv);
+}
+
+void
+URLWorker::SetPathname(const nsAString& aPathname, ErrorResult& aRv)
+{
+  RefPtr<SetterRunnable> runnable =
+    new SetterRunnable(mWorkerPrivate, SetterRunnable::SetterPathname,
+                       aPathname, mURLProxy);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  MOZ_ASSERT(!runnable->Failed());
+}
+
+void
+URLWorker::GetSearch(nsAString& aSearch, ErrorResult& aRv) const
+{
+  RefPtr<GetterRunnable> runnable =
+    new GetterRunnable(mWorkerPrivate, GetterRunnable::GetterSearch, aSearch,
+                       mURLProxy);
+
+  runnable->Dispatch(aRv);
+}
+
+void
+URLWorker::GetHash(nsAString& aHash, ErrorResult& aRv) const
+{
+  RefPtr<GetterRunnable> runnable =
+    new GetterRunnable(mWorkerPrivate, GetterRunnable::GetterHash, aHash,
+                       mURLProxy);
+
+  runnable->Dispatch(aRv);
+}
+
+void
+URLWorker::SetHash(const nsAString& aHash, ErrorResult& aRv)
+{
+  RefPtr<SetterRunnable> runnable =
+    new SetterRunnable(mWorkerPrivate, SetterRunnable::SetterHash,
+                       aHash, mURLProxy);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  MOZ_ASSERT(!runnable->Failed());
+}
+
+void
+URLWorker::SetSearchInternal(const nsAString& aSearch, ErrorResult& aRv)
+{
+  RefPtr<SetterRunnable> runnable =
+    new SetterRunnable(mWorkerPrivate, SetterRunnable::SetterSearch,
+                       aSearch, mURLProxy);
+
+  runnable->Dispatch(aRv);
+  if (NS_WARN_IF(aRv.Failed())) {
+    return;
+  }
+
+  MOZ_ASSERT(!runnable->Failed());
+}
+
+void
+URLWorker::UpdateURLSearchParams()
+{
+  if (mSearchParams) {
+    nsAutoString search;
+
+    ErrorResult rv;
+    GetSearch(search, rv);
+    if (NS_WARN_IF(rv.Failed())) {
+      rv.SuppressException();
+    }
+
+    mSearchParams->ParseInput(NS_ConvertUTF16toUTF8(Substring(search, 1)));
+  }
+}
+
+} // anonymous namespace
+
+///////////////////////////////////////////////////////////////////////////////
+// Base class for URL
+///////////////////////////////////////////////////////////////////////////////
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(URL, mParent, mSearchParams)
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(URL)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(URL)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(URL)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+JSObject*
+URL::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return URLBinding::Wrap(aCx, this, aGivenProto);
+}
+
+/* static */ already_AddRefed<URL>
+URL::Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+                 URL& aBase, ErrorResult& aRv)
+{
+  if (NS_IsMainThread()) {
+    return URLMainThread::Constructor(aGlobal, aURL, aBase, aRv);
+  }
+
+  return URLWorker::Constructor(aGlobal, aURL, aBase, aRv);
+}
+
+/* static */ already_AddRefed<URL>
+URL::Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+                 const Optional<nsAString>& aBase, ErrorResult& aRv)
+{
+  if (NS_IsMainThread()) {
+    return URLMainThread::Constructor(aGlobal, aURL, aBase, aRv);
+  }
+
+  return URLWorker::Constructor(aGlobal, aURL, aBase, aRv);
+}
+
+/* static */ already_AddRefed<URL>
+URL::WorkerConstructor(const GlobalObject& aGlobal, const nsAString& aURL,
+                       const nsAString& aBase, ErrorResult& aRv)
+{
+  return URLWorker::Constructor(aGlobal, aURL, aBase, aRv);
+}
+
+void
+URL::CreateObjectURL(const GlobalObject& aGlobal, Blob& aBlob,
+                     const objectURLOptions& aOptions, nsAString& aResult,
+                     ErrorResult& aRv)
+{
+  if (NS_IsMainThread()) {
+    URLMainThread::CreateObjectURL(aGlobal, aBlob, aOptions, aResult, aRv);
+  } else {
+    URLWorker::CreateObjectURL(aGlobal, aBlob, aOptions, aResult, aRv);
+  }
+}
+
+void
+URL::CreateObjectURL(const GlobalObject& aGlobal, DOMMediaStream& aStream,
+                     const objectURLOptions& aOptions, nsAString& aResult,
+                     ErrorResult& aRv)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  URLMainThread::CreateObjectURL(aGlobal, aStream, aOptions, aResult, aRv);
+}
+
+void
+URL::CreateObjectURL(const GlobalObject& aGlobal, MediaSource& aSource,
+                     const objectURLOptions& aOptions,
+                     nsAString& aResult,
+                     ErrorResult& aRv)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  URLMainThread::CreateObjectURL(aGlobal, aSource, aOptions, aResult, aRv);
+}
+
+void
+URL::RevokeObjectURL(const GlobalObject& aGlobal, const nsAString& aURL,
+                     ErrorResult& aRv)
+{
+  if (NS_IsMainThread()) {
+    URLMainThread::RevokeObjectURL(aGlobal, aURL, aRv);
+  } else {
+    URLWorker::RevokeObjectURL(aGlobal, aURL, aRv);
+  }
+}
+
+bool
+URL::IsValidURL(const GlobalObject& aGlobal, const nsAString& aURL,
+                ErrorResult& aRv)
+{
+  if (NS_IsMainThread()) {
+    return URLMainThread::IsValidURL(aGlobal, aURL, aRv);
+  }
+  return URLWorker::IsValidURL(aGlobal, aURL, aRv);
+}
+
+URLSearchParams*
+URL::SearchParams()
+{
+  CreateSearchParamsIfNeeded();
+  return mSearchParams;
+}
+
+bool IsChromeURI(nsIURI* aURI)
+{
+  bool isChrome = false;
+  if (NS_SUCCEEDED(aURI->SchemeIs("chrome", &isChrome)))
+      return isChrome;
+  return false;
+}
+
+void
+URL::CreateSearchParamsIfNeeded()
+{
+  if (!mSearchParams) {
+    mSearchParams = new URLSearchParams(mParent, this);
+    UpdateURLSearchParams();
+  }
+}
+
+void
+URL::SetSearch(const nsAString& aSearch, ErrorResult& aRv)
+{
+  SetSearchInternal(aSearch, aRv);
+  UpdateURLSearchParams();
+}
+
+void
+URL::URLSearchParamsUpdated(URLSearchParams* aSearchParams)
+{
+  MOZ_ASSERT(mSearchParams);
+  MOZ_ASSERT(mSearchParams == aSearchParams);
+
+  nsAutoString search;
+  mSearchParams->Serialize(search);
+
+  ErrorResult rv;
+  SetSearchInternal(search, rv);
+  NS_WARNING_ASSERTION(!rv.Failed(), "SetSearchInternal failed");
+  rv.SuppressException();
+}
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/url/URL.h b/dom/url/URL.h
new file mode 100644
index 000000000..16b4678ba
--- /dev/null
+++ b/dom/url/URL.h
@@ -0,0 +1,183 @@
+/* -*- 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_URL_h
+#define mozilla_dom_URL_h
+
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/dom/URLSearchParams.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsString.h"
+#include "nsWrapperCache.h"
+
+class nsISupports;
+class nsIURI;
+
+namespace mozilla {
+
+class ErrorResult;
+class DOMMediaStream;
+
+namespace dom {
+
+class Blob;
+class MediaSource;
+class GlobalObject;
+struct objectURLOptions;
+
+class URL : public URLSearchParamsObserver
+          , public nsWrapperCache
+{
+public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(URL)
+
+  URL(nsISupports* aParent)
+    : mParent(aParent)
+  {}
+
+  // WebIDL methods
+  nsISupports* GetParentObject() const
+  {
+    return mParent;
+  }
+
+  virtual JSObject*
+  WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  static already_AddRefed<URL>
+  Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+              URL& aBase, ErrorResult& aRv);
+
+  static already_AddRefed<URL>
+  Constructor(const GlobalObject& aGlobal, const nsAString& aURL,
+              const Optional<nsAString>& aBase, ErrorResult& aRv);
+
+  // Helper for Fetch API
+  static already_AddRefed<URL>
+  WorkerConstructor(const GlobalObject& aGlobal, const nsAString& aURL,
+                    const nsAString& aBase, ErrorResult& aRv);
+
+
+  static void
+  CreateObjectURL(const GlobalObject& aGlobal, Blob& aBlob,
+                  const objectURLOptions& aOptions,
+                  nsAString& aResult, ErrorResult& aRv);
+
+  static void
+  CreateObjectURL(const GlobalObject& aGlobal, DOMMediaStream& aStream,
+                  const objectURLOptions& aOptions, nsAString& aResult,
+                  ErrorResult& aRv);
+
+  static void
+  CreateObjectURL(const GlobalObject& aGlobal, MediaSource& aSource,
+                  const objectURLOptions& aOptions, nsAString& aResult,
+                  ErrorResult& aRv);
+
+  static void
+  RevokeObjectURL(const GlobalObject& aGlobal, const nsAString& aURL,
+                  ErrorResult& aRv);
+
+  static bool
+  IsValidURL(const GlobalObject& aGlobal, const nsAString& aURL,
+             ErrorResult& aRv);
+
+  virtual void
+  GetHref(nsAString& aHref, ErrorResult& aRv) const = 0;
+
+  virtual void
+  SetHref(const nsAString& aHref, ErrorResult& aRv) = 0;
+
+  virtual void
+  GetOrigin(nsAString& aOrigin, ErrorResult& aRv) const = 0;
+
+  virtual void
+  GetProtocol(nsAString& aProtocol, ErrorResult& aRv) const = 0;
+
+  virtual void
+  SetProtocol(const nsAString& aProtocol, ErrorResult& aRv) = 0;
+
+  virtual void
+  GetUsername(nsAString& aUsername, ErrorResult& aRv) const = 0;
+
+  virtual void
+  SetUsername(const nsAString& aUsername, ErrorResult& aRv) = 0;
+
+  virtual void
+  GetPassword(nsAString& aPassword, ErrorResult& aRv) const = 0;
+
+  virtual void
+  SetPassword(const nsAString& aPassword, ErrorResult& aRv) = 0;
+
+  virtual void
+  GetHost(nsAString& aHost, ErrorResult& aRv) const = 0;
+
+  virtual void
+  SetHost(const nsAString& aHost, ErrorResult& aRv) = 0;
+
+  virtual void
+  GetHostname(nsAString& aHostname, ErrorResult& aRv) const = 0;
+
+  virtual void
+  SetHostname(const nsAString& aHostname, ErrorResult& aRv) = 0;
+
+  virtual void
+  GetPort(nsAString& aPort, ErrorResult& aRv) const = 0;
+
+  virtual void
+  SetPort(const nsAString& aPort, ErrorResult& aRv) = 0;
+
+  virtual void
+  GetPathname(nsAString& aPathname, ErrorResult& aRv) const = 0;
+
+  virtual void
+  SetPathname(const nsAString& aPathname, ErrorResult& aRv) = 0;
+
+  virtual void
+  GetSearch(nsAString& aSearch, ErrorResult& aRv) const = 0;
+
+  virtual void
+  SetSearch(const nsAString& aSearch, ErrorResult& aRv);
+
+  URLSearchParams* SearchParams();
+
+  virtual void
+  GetHash(nsAString& aHost, ErrorResult& aRv) const = 0;
+
+  virtual void
+  SetHash(const nsAString& aHash, ErrorResult& aRv) = 0;
+
+  void Stringify(nsAString& aRetval, ErrorResult& aRv) const
+  {
+    GetHref(aRetval, aRv);
+  }
+
+  // URLSearchParamsObserver
+  void
+  URLSearchParamsUpdated(URLSearchParams* aSearchParams) override;
+
+protected:
+  virtual ~URL()
+  {}
+
+  virtual void
+  UpdateURLSearchParams() = 0;
+
+  virtual void
+  SetSearchInternal(const nsAString& aSearch, ErrorResult& aRv) = 0;
+
+  void CreateSearchParamsIfNeeded();
+
+  nsCOMPtr<nsISupports> mParent;
+  RefPtr<URLSearchParams> mSearchParams;
+};
+
+bool IsChromeURI(nsIURI* aURI);
+
+} // namespace dom
+} // namespace mozilla
+
+#endif /* mozilla_dom_URL_h */
diff --git a/dom/url/URLSearchParams.cpp b/dom/url/URLSearchParams.cpp
new file mode 100644
index 000000000..d9492f81c
--- /dev/null
+++ b/dom/url/URLSearchParams.cpp
@@ -0,0 +1,549 @@
+/* -*- 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 "URLSearchParams.h"
+#include "mozilla/dom/URLSearchParamsBinding.h"
+#include "mozilla/dom/EncodingUtils.h"
+#include "nsDOMString.h"
+#include "nsIInputStream.h"
+#include "nsStringStream.h"
+
+namespace mozilla {
+namespace dom {
+
+bool
+URLParams::Has(const nsAString& aName)
+{
+  for (uint32_t i = 0, len = mParams.Length(); i < len; ++i) {
+    if (mParams[i].mKey.Equals(aName)) {
+      return true;
+    }
+  }
+
+  return false;
+}
+
+void
+URLParams::Get(const nsAString& aName, nsString& aRetval)
+{
+  SetDOMStringToNull(aRetval);
+
+  for (uint32_t i = 0, len = mParams.Length(); i < len; ++i) {
+    if (mParams[i].mKey.Equals(aName)) {
+      aRetval.Assign(mParams[i].mValue);
+      break;
+    }
+  }
+}
+
+void
+URLParams::GetAll(const nsAString& aName, nsTArray<nsString>& aRetval)
+{
+  aRetval.Clear();
+
+  for (uint32_t i = 0, len = mParams.Length(); i < len; ++i) {
+    if (mParams[i].mKey.Equals(aName)) {
+      aRetval.AppendElement(mParams[i].mValue);
+    }
+  }
+}
+
+void
+URLParams::Append(const nsAString& aName, const nsAString& aValue)
+{
+  Param* param = mParams.AppendElement();
+  param->mKey = aName;
+  param->mValue = aValue;
+}
+
+void
+URLParams::Set(const nsAString& aName, const nsAString& aValue)
+{
+  Param* param = nullptr;
+  for (uint32_t i = 0, len = mParams.Length(); i < len;) {
+    if (!mParams[i].mKey.Equals(aName)) {
+      ++i;
+      continue;
+    }
+    if (!param) {
+      param = &mParams[i];
+      ++i;
+      continue;
+    }
+    // Remove duplicates.
+    mParams.RemoveElementAt(i);
+    --len;
+  }
+
+  if (!param) {
+    param = mParams.AppendElement();
+    param->mKey = aName;
+  }
+
+  param->mValue = aValue;
+}
+
+bool
+URLParams::Delete(const nsAString& aName)
+{
+  bool found = false;
+  for (uint32_t i = 0; i < mParams.Length();) {
+    if (mParams[i].mKey.Equals(aName)) {
+      mParams.RemoveElementAt(i);
+      found = true;
+    } else {
+      ++i;
+    }
+  }
+
+  return found;
+}
+
+void
+URLParams::ConvertString(const nsACString& aInput, nsAString& aOutput)
+{
+  aOutput.Truncate();
+
+  if (!mDecoder) {
+    mDecoder = EncodingUtils::DecoderForEncoding("UTF-8");
+    if (!mDecoder) {
+      MOZ_ASSERT(mDecoder, "Failed to create a decoder.");
+      return;
+    }
+  }
+
+  int32_t inputLength = aInput.Length();
+  int32_t outputLength = 0;
+
+  nsresult rv = mDecoder->GetMaxLength(aInput.BeginReading(), inputLength,
+                                       &outputLength);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  if (!aOutput.SetLength(outputLength, fallible)) {
+    return;
+  }
+
+  int32_t newOutputLength = outputLength;
+  rv = mDecoder->Convert(aInput.BeginReading(), &inputLength,
+                         aOutput.BeginWriting(), &newOutputLength);
+  if (NS_FAILED(rv)) {
+    aOutput.Truncate();
+    return;
+  }
+  if (newOutputLength < outputLength) {
+    aOutput.Truncate(newOutputLength);
+  }
+}
+
+void
+URLParams::DecodeString(const nsACString& aInput, nsAString& aOutput)
+{
+  nsACString::const_iterator start, end;
+  aInput.BeginReading(start);
+  aInput.EndReading(end);
+
+  nsCString unescaped;
+
+  while (start != end) {
+    // replace '+' with U+0020
+    if (*start == '+') {
+      unescaped.Append(' ');
+      ++start;
+      continue;
+    }
+
+    // Percent decode algorithm
+    if (*start == '%') {
+      nsACString::const_iterator first(start);
+      ++first;
+
+      nsACString::const_iterator second(first);
+      ++second;
+
+#define ASCII_HEX_DIGIT( x )    \
+  ((x >= 0x41 && x <= 0x46) ||  \
+   (x >= 0x61 && x <= 0x66) ||  \
+   (x >= 0x30 && x <= 0x39))
+
+#define HEX_DIGIT( x )              \
+   (*x >= 0x30 && *x <= 0x39        \
+     ? *x - 0x30                    \
+     : (*x >= 0x41 && *x <= 0x46    \
+        ? *x - 0x37                 \
+        : *x - 0x57))
+
+      if (first != end && second != end &&
+          ASCII_HEX_DIGIT(*first) && ASCII_HEX_DIGIT(*second)) {
+        unescaped.Append(HEX_DIGIT(first) * 16 + HEX_DIGIT(second));
+        start = ++second;
+        continue;
+
+      } else {
+        unescaped.Append('%');
+        ++start;
+        continue;
+      }
+    }
+
+    unescaped.Append(*start);
+    ++start;
+  }
+
+  ConvertString(unescaped, aOutput);
+}
+
+void
+URLParams::ParseInput(const nsACString& aInput)
+{
+  // Remove all the existing data before parsing a new input.
+  DeleteAll();
+
+  nsACString::const_iterator start, end;
+  aInput.BeginReading(start);
+  aInput.EndReading(end);
+  nsACString::const_iterator iter(start);
+
+  while (start != end) {
+    nsAutoCString string;
+
+    if (FindCharInReadable('&', iter, end)) {
+      string.Assign(Substring(start, iter));
+      start = ++iter;
+    } else {
+      string.Assign(Substring(start, end));
+      start = end;
+    }
+
+    if (string.IsEmpty()) {
+      continue;
+    }
+
+    nsACString::const_iterator eqStart, eqEnd;
+    string.BeginReading(eqStart);
+    string.EndReading(eqEnd);
+    nsACString::const_iterator eqIter(eqStart);
+
+    nsAutoCString name;
+    nsAutoCString value;
+
+    if (FindCharInReadable('=', eqIter, eqEnd)) {
+      name.Assign(Substring(eqStart, eqIter));
+
+      ++eqIter;
+      value.Assign(Substring(eqIter, eqEnd));
+    } else {
+      name.Assign(string);
+    }
+
+    nsAutoString decodedName;
+    DecodeString(name, decodedName);
+
+    nsAutoString decodedValue;
+    DecodeString(value, decodedValue);
+
+    Append(decodedName, decodedValue);
+  }
+}
+
+namespace {
+
+void SerializeString(const nsCString& aInput, nsAString& aValue)
+{
+  const unsigned char* p = (const unsigned char*) aInput.get();
+  const unsigned char* end = p + aInput.Length();
+
+  while (p != end) {
+    // ' ' to '+'
+    if (*p == 0x20) {
+      aValue.Append(0x2B);
+    // Percent Encode algorithm
+    } else if (*p == 0x2A || *p == 0x2D || *p == 0x2E ||
+               (*p >= 0x30 && *p <= 0x39) ||
+               (*p >= 0x41 && *p <= 0x5A) || *p == 0x5F ||
+               (*p >= 0x61 && *p <= 0x7A)) {
+      aValue.Append(*p);
+    } else {
+      aValue.AppendPrintf("%%%.2X", *p);
+    }
+
+    ++p;
+  }
+}
+
+} // namespace
+
+void
+URLParams::Serialize(nsAString& aValue) const
+{
+  aValue.Truncate();
+  bool first = true;
+
+  for (uint32_t i = 0, len = mParams.Length(); i < len; ++i) {
+    if (first) {
+      first = false;
+    } else {
+      aValue.Append('&');
+    }
+
+    SerializeString(NS_ConvertUTF16toUTF8(mParams[i].mKey), aValue);
+    aValue.Append('=');
+    SerializeString(NS_ConvertUTF16toUTF8(mParams[i].mValue), aValue);
+  }
+}
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(URLSearchParams, mParent, mObserver)
+NS_IMPL_CYCLE_COLLECTING_ADDREF(URLSearchParams)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(URLSearchParams)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(URLSearchParams)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsIXHRSendable)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+URLSearchParams::URLSearchParams(nsISupports* aParent,
+                                 URLSearchParamsObserver* aObserver)
+  : mParams(new URLParams())
+  , mParent(aParent)
+  , mObserver(aObserver)
+{
+}
+
+URLSearchParams::URLSearchParams(nsISupports* aParent,
+                                 const URLSearchParams& aOther)
+  : mParams(new URLParams(*aOther.mParams.get()))
+  , mParent(aParent)
+  , mObserver(nullptr)
+{
+}
+
+URLSearchParams::~URLSearchParams()
+{
+  DeleteAll();
+}
+
+JSObject*
+URLSearchParams::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return URLSearchParamsBinding::Wrap(aCx, this, aGivenProto);
+}
+
+/* static */ already_AddRefed<URLSearchParams>
+URLSearchParams::Constructor(const GlobalObject& aGlobal,
+                             const nsAString& aInit,
+                             ErrorResult& aRv)
+{
+  RefPtr<URLSearchParams> sp =
+    new URLSearchParams(aGlobal.GetAsSupports(), nullptr);
+
+  NS_ConvertUTF16toUTF8 input(aInit);
+
+  if (StringBeginsWith(input, NS_LITERAL_CSTRING("?"))) {
+    sp->ParseInput(Substring(input, 1, input.Length() - 1));
+  } else {
+    sp->ParseInput(input);
+  }
+
+  return sp.forget();
+}
+
+/* static */ already_AddRefed<URLSearchParams>
+URLSearchParams::Constructor(const GlobalObject& aGlobal,
+                             URLSearchParams& aInit,
+                             ErrorResult& aRv)
+{
+  RefPtr<URLSearchParams> sp =
+    new URLSearchParams(aGlobal.GetAsSupports(), aInit);
+
+  return sp.forget();
+}
+
+void
+URLSearchParams::ParseInput(const nsACString& aInput)
+{
+  mParams->ParseInput(aInput);
+}
+
+void
+URLSearchParams::Get(const nsAString& aName, nsString& aRetval)
+{
+  return mParams->Get(aName, aRetval);
+}
+
+void
+URLSearchParams::GetAll(const nsAString& aName, nsTArray<nsString>& aRetval)
+{
+  return mParams->GetAll(aName, aRetval);
+}
+
+void
+URLSearchParams::Set(const nsAString& aName, const nsAString& aValue)
+{
+  mParams->Set(aName, aValue);
+  NotifyObserver();
+}
+
+void
+URLSearchParams::Append(const nsAString& aName, const nsAString& aValue)
+{
+  mParams->Append(aName, aValue);
+  NotifyObserver();
+}
+
+bool
+URLSearchParams::Has(const nsAString& aName)
+{
+  return mParams->Has(aName);
+}
+
+void
+URLSearchParams::Delete(const nsAString& aName)
+{
+  if (mParams->Delete(aName)) {
+    NotifyObserver();
+  }
+}
+
+void
+URLSearchParams::DeleteAll()
+{
+  mParams->DeleteAll();
+}
+
+void
+URLSearchParams::Serialize(nsAString& aValue) const
+{
+  mParams->Serialize(aValue);
+}
+
+void
+URLSearchParams::NotifyObserver()
+{
+  if (mObserver) {
+    mObserver->URLSearchParamsUpdated(this);
+  }
+}
+
+uint32_t
+URLSearchParams::GetIterableLength() const
+{
+  return mParams->Length();
+}
+
+const nsAString&
+URLSearchParams::GetKeyAtIndex(uint32_t aIndex) const
+{
+  return mParams->GetKeyAtIndex(aIndex);
+}
+
+const nsAString&
+URLSearchParams::GetValueAtIndex(uint32_t aIndex) const
+{
+  return mParams->GetValueAtIndex(aIndex);
+}
+
+// Helper functions for structured cloning
+inline bool
+ReadString(JSStructuredCloneReader* aReader, nsString& aString)
+{
+  MOZ_ASSERT(aReader);
+
+  bool read;
+  uint32_t nameLength, zero;
+  read = JS_ReadUint32Pair(aReader, &nameLength, &zero);
+  if (!read) {
+    return false;
+  }
+  MOZ_ASSERT(zero == 0);
+  aString.SetLength(nameLength);
+  size_t charSize = sizeof(nsString::char_type);
+  read = JS_ReadBytes(aReader, (void*) aString.BeginWriting(),
+                      nameLength * charSize);
+  if (!read) {
+    return false;
+  }
+
+  return true;
+}
+
+inline bool
+WriteString(JSStructuredCloneWriter* aWriter, const nsString& aString)
+{
+  MOZ_ASSERT(aWriter);
+
+  size_t charSize = sizeof(nsString::char_type);
+  return JS_WriteUint32Pair(aWriter, aString.Length(), 0) &&
+         JS_WriteBytes(aWriter, aString.get(), aString.Length() * charSize);
+}
+
+bool
+URLParams::WriteStructuredClone(JSStructuredCloneWriter* aWriter) const
+{
+  const uint32_t& nParams = mParams.Length();
+  if (!JS_WriteUint32Pair(aWriter, nParams, 0)) {
+    return false;
+  }
+  for (uint32_t i = 0; i < nParams; ++i) {
+    if (!WriteString(aWriter, mParams[i].mKey) ||
+        !WriteString(aWriter, mParams[i].mValue)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+bool
+URLParams::ReadStructuredClone(JSStructuredCloneReader* aReader)
+{
+  MOZ_ASSERT(aReader);
+
+  DeleteAll();
+
+  uint32_t nParams, zero;
+  nsAutoString key, value;
+  if (!JS_ReadUint32Pair(aReader, &nParams, &zero)) {
+    return false;
+  }
+  MOZ_ASSERT(zero == 0);
+  for (uint32_t i = 0; i < nParams; ++i) {
+    if (!ReadString(aReader, key) || !ReadString(aReader, value)) {
+      return false;
+    }
+    Append(key, value);
+  }
+  return true;
+}
+
+bool
+URLSearchParams::WriteStructuredClone(JSStructuredCloneWriter* aWriter) const
+{
+  return mParams->WriteStructuredClone(aWriter);
+}
+
+bool
+URLSearchParams::ReadStructuredClone(JSStructuredCloneReader* aReader)
+{
+ return mParams->ReadStructuredClone(aReader);
+}
+
+NS_IMETHODIMP
+URLSearchParams::GetSendInfo(nsIInputStream** aBody, uint64_t* aContentLength,
+                             nsACString& aContentType, nsACString& aCharset)
+{
+  aContentType.AssignLiteral("application/x-www-form-urlencoded");
+  aCharset.AssignLiteral("UTF-8");
+
+  nsAutoString serialized;
+  Serialize(serialized);
+  NS_ConvertUTF16toUTF8 converted(serialized);
+  *aContentLength = converted.Length();
+  return NS_NewCStringInputStream(aBody, converted);
+}
+
+} // namespace dom
+} // namespace mozilla
diff --git a/dom/url/URLSearchParams.h b/dom/url/URLSearchParams.h
new file mode 100644
index 000000000..4b0aaa991
--- /dev/null
+++ b/dom/url/URLSearchParams.h
@@ -0,0 +1,223 @@
+/* -*- 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_URLSearchParams_h
+#define mozilla_dom_URLSearchParams_h
+
+#include "js/StructuredClone.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "mozilla/ErrorResult.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsWrapperCache.h"
+#include "nsISupports.h"
+#include "nsIUnicodeDecoder.h"
+#include "nsIXMLHttpRequest.h"
+
+namespace mozilla {
+namespace dom {
+
+class URLSearchParams;
+
+class URLSearchParamsObserver : public nsISupports
+{
+public:
+  virtual ~URLSearchParamsObserver() {}
+
+  virtual void URLSearchParamsUpdated(URLSearchParams* aFromThis) = 0;
+};
+
+// This class is used in BasePrincipal and it's _extremely_ important that the
+// attributes are kept in the correct order. If this changes, please, update
+// BasePrincipal code.
+
+class URLParams final
+{
+public:
+  URLParams() {}
+
+  ~URLParams()
+  {
+    DeleteAll();
+  }
+
+  explicit URLParams(const URLParams& aOther)
+    : mParams(aOther.mParams)
+  {}
+
+  URLParams(const URLParams&& aOther)
+    : mParams(Move(aOther.mParams))
+  {}
+
+  class ForEachIterator
+  {
+  public:
+    virtual bool
+    URLParamsIterator(const nsString& aName, const nsString& aValue) = 0;
+  };
+
+  void
+  ParseInput(const nsACString& aInput);
+
+  bool
+  ForEach(ForEachIterator& aIterator) const
+  {
+    for (uint32_t i = 0; i < mParams.Length(); ++i) {
+      if (!aIterator.URLParamsIterator(mParams[i].mKey, mParams[i].mValue)) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  void Serialize(nsAString& aValue) const;
+
+  void Get(const nsAString& aName, nsString& aRetval);
+
+  void GetAll(const nsAString& aName, nsTArray<nsString >& aRetval);
+
+  void Set(const nsAString& aName, const nsAString& aValue);
+
+  void Append(const nsAString& aName, const nsAString& aValue);
+
+  bool Has(const nsAString& aName);
+
+  // Returns true if aName was found and deleted, false otherwise.
+  bool Delete(const nsAString& aName);
+
+  void DeleteAll()
+  {
+    mParams.Clear();
+  }
+
+  uint32_t Length() const
+  {
+    return mParams.Length();
+  }
+
+  const nsAString& GetKeyAtIndex(uint32_t aIndex) const
+  {
+    MOZ_ASSERT(aIndex < mParams.Length());
+    return mParams[aIndex].mKey;
+  }
+
+  const nsAString& GetValueAtIndex(uint32_t aIndex) const
+  {
+    MOZ_ASSERT(aIndex < mParams.Length());
+    return mParams[aIndex].mValue;
+  }
+
+  bool
+  ReadStructuredClone(JSStructuredCloneReader* aReader);
+
+  bool
+  WriteStructuredClone(JSStructuredCloneWriter* aWriter) const;
+
+private:
+  void DecodeString(const nsACString& aInput, nsAString& aOutput);
+  void ConvertString(const nsACString& aInput, nsAString& aOutput);
+
+  struct Param
+  {
+    nsString mKey;
+    nsString mValue;
+  };
+
+  nsTArray<Param> mParams;
+  nsCOMPtr<nsIUnicodeDecoder> mDecoder;
+};
+
+class URLSearchParams final : public nsIXHRSendable,
+                              public nsWrapperCache
+{
+  ~URLSearchParams();
+
+public:
+  NS_DECL_NSIXHRSENDABLE
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(URLSearchParams)
+
+  explicit URLSearchParams(nsISupports* aParent,
+                           URLSearchParamsObserver* aObserver=nullptr);
+
+  URLSearchParams(nsISupports* aParent,
+                  const URLSearchParams& aOther);
+
+  // WebIDL methods
+  nsISupports* GetParentObject() const
+  {
+    return mParent;
+  }
+
+  virtual JSObject*
+  WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  static already_AddRefed<URLSearchParams>
+  Constructor(const GlobalObject& aGlobal, const nsAString& aInit,
+              ErrorResult& aRv);
+
+  static already_AddRefed<URLSearchParams>
+  Constructor(const GlobalObject& aGlobal, URLSearchParams& aInit,
+              ErrorResult& aRv);
+
+  void ParseInput(const nsACString& aInput);
+
+  void Serialize(nsAString& aValue) const;
+
+  void Get(const nsAString& aName, nsString& aRetval);
+
+  void GetAll(const nsAString& aName, nsTArray<nsString>& aRetval);
+
+  void Set(const nsAString& aName, const nsAString& aValue);
+
+  void Append(const nsAString& aName, const nsAString& aValue);
+
+  bool Has(const nsAString& aName);
+
+  void Delete(const nsAString& aName);
+
+  uint32_t GetIterableLength() const;
+  const nsAString& GetKeyAtIndex(uint32_t aIndex) const;
+  const nsAString& GetValueAtIndex(uint32_t aIndex) const;
+
+  void Stringify(nsString& aRetval) const
+  {
+    Serialize(aRetval);
+  }
+
+  typedef URLParams::ForEachIterator ForEachIterator;
+
+  bool
+  ForEach(ForEachIterator& aIterator) const
+  {
+    return mParams->ForEach(aIterator);
+
+    return true;
+  }
+
+  bool
+  ReadStructuredClone(JSStructuredCloneReader* aReader);
+
+  bool
+  WriteStructuredClone(JSStructuredCloneWriter* aWriter) const;
+
+private:
+  void AppendInternal(const nsAString& aName, const nsAString& aValue);
+
+  void DeleteAll();
+
+  void NotifyObserver();
+
+  UniquePtr<URLParams> mParams;
+  nsCOMPtr<nsISupports> mParent;
+  RefPtr<URLSearchParamsObserver> mObserver;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif /* mozilla_dom_URLSearchParams_h */
diff --git a/dom/url/moz.build b/dom/url/moz.build
new file mode 100644
index 000000000..628b69101
--- /dev/null
+++ b/dom/url/moz.build
@@ -0,0 +1,27 @@
+# -*- 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 += [
+    'URL.h',
+    'URLSearchParams.h',
+]
+
+UNIFIED_SOURCES += [
+    'URL.cpp',
+    'URLSearchParams.cpp',
+]
+
+LOCAL_INCLUDES += [
+    '../workers',
+]
+
+MOCHITEST_MANIFESTS += ['tests/mochitest.ini']
+MOCHITEST_CHROME_MANIFESTS += [ 'tests/chrome.ini' ]
+BROWSER_CHROME_MANIFESTS += [ 'tests/browser.ini' ]
+
+include('/ipc/chromium/chromium-config.mozbuild')
+
+FINAL_LIBRARY = 'xul'
diff --git a/dom/url/tests/browser.ini b/dom/url/tests/browser.ini
new file mode 100644
index 000000000..ad58be903
--- /dev/null
+++ b/dom/url/tests/browser.ini
@@ -0,0 +1,5 @@
+[DEFAULT]
+support-files =
+  empty.html
+
+[browser_download_after_revoke.js]
diff --git a/dom/url/tests/browser_download_after_revoke.js b/dom/url/tests/browser_download_after_revoke.js
new file mode 100644
index 000000000..3e521eafe
--- /dev/null
+++ b/dom/url/tests/browser_download_after_revoke.js
@@ -0,0 +1,53 @@
+function test () {
+  waitForExplicitFinish();
+  gBrowser.selectedTab = gBrowser.addTab();
+
+  function onLoad() {
+    info("Page loaded.");
+    gBrowser.selectedBrowser.removeEventListener("load", onLoad, true);
+
+    var listener = {
+      onOpenWindow: function(aXULWindow) {
+        info("Download window shown...");
+        Services.wm.removeListener(listener);
+
+        function downloadOnLoad() {
+          domwindow.removeEventListener("load", downloadOnLoad, true);
+
+	  is(domwindow.document.location.href, "chrome://mozapps/content/downloads/unknownContentType.xul", "Download page appeared");
+
+	  domwindow.close();
+          gBrowser.removeTab(gBrowser.selectedTab);
+	  finish();
+        }
+
+        var domwindow = aXULWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+                                  .getInterface(Ci.nsIDOMWindow);
+        domwindow.addEventListener("load", downloadOnLoad, true);
+      },
+      onCloseWindow: function(aXULWindow) {},
+      onWindowTitleChange: function(aXULWindow, aNewTitle) {}
+    }
+
+    Services.wm.addListener(listener);
+
+    info("Creating BlobURL and clicking on a HTMLAnchorElement...");
+    ContentTask.spawn(gBrowser.selectedBrowser, null, function() {
+      let blob = new content.Blob(['test'], { type: 'text/plain' });
+      let url = content.URL.createObjectURL(blob);
+
+      let link = content.document.createElement('a');
+      link.href = url;
+      link.download = 'example.txt';
+      content.document.body.appendChild(link);
+      link.click();
+
+      content.URL.revokeObjectURL(url);
+    });
+  }
+
+  gBrowser.selectedBrowser.addEventListener("load", onLoad, true);
+
+  info("Loading download page...");
+  content.location = "http://example.com/browser/dom/url/tests/empty.html";
+}
diff --git a/dom/url/tests/chrome.ini b/dom/url/tests/chrome.ini
new file mode 100644
index 000000000..256fda02b
--- /dev/null
+++ b/dom/url/tests/chrome.ini
@@ -0,0 +1,12 @@
+[DEFAULT]
+skip-if = os == 'android'
+support-files =
+  file_url.jsm
+  file_worker_url.jsm
+  test_bug883784.jsm
+  jsm_url_worker.js
+  !/dom/workers/test/dom_worker_helper.js
+
+[test_bug883784.xul]
+[test_url.xul]
+[test_worker_url.xul]
diff --git a/dom/url/tests/empty.html b/dom/url/tests/empty.html
new file mode 100644
index 000000000..358db717d
--- /dev/null
+++ b/dom/url/tests/empty.html
@@ -0,0 +1,2 @@
+<!DOCTYPE HTML>
+<html><body></body></html>
diff --git a/dom/url/tests/file_url.jsm b/dom/url/tests/file_url.jsm
new file mode 100644
index 000000000..a90f8c95d
--- /dev/null
+++ b/dom/url/tests/file_url.jsm
@@ -0,0 +1,22 @@
+this.EXPORTED_SYMBOLS = ['checkFromJSM'];
+
+this.checkFromJSM = function checkFromJSM(ok, is) {
+  Components.utils.importGlobalProperties(['URL', 'Blob']);
+
+  var url = new URL('http://www.example.com');
+  is(url.href, "http://www.example.com/", "JSM should have URL");
+
+  var url2 = new URL('/foobar', url);
+  is(url2.href, "http://www.example.com/foobar", "JSM should have URL - based on another URL");
+
+  var blob = new Blob(['a']);
+  var url = URL.createObjectURL(blob);
+  ok(url, "URL is created!");
+
+  var u = new URL(url);
+  ok(u, "URL created");
+  is(u.origin, "null", "Url doesn't have an origin if created in a JSM");
+
+  URL.revokeObjectURL(url);
+  ok(true, "URL is revoked");
+}
diff --git a/dom/url/tests/file_worker_url.jsm b/dom/url/tests/file_worker_url.jsm
new file mode 100644
index 000000000..d0bbf62fe
--- /dev/null
+++ b/dom/url/tests/file_worker_url.jsm
@@ -0,0 +1,26 @@
+this.EXPORTED_SYMBOLS = ['checkFromJSM'];
+
+Components.utils.importGlobalProperties(['URL']);
+
+this.checkFromJSM = function checkFromJSM(ok, is, finish) {
+  let worker = new ChromeWorker("jsm_url_worker.js");
+  worker.onmessage = function(event) {
+
+   if (event.data.type == 'finish') {
+     finish();
+    } else if (event.data.type == 'url') {
+      URL.revokeObjectURL(event.data.url);
+    } else if (event.data.type == 'status') {
+      ok(event.data.status, event.data.msg);
+    }
+  }
+
+  worker.onerror = function(event) {
+    is(event.target, worker);
+    ok(false, "Worker had an error: " + event.data);
+    worker.terminate();
+    finish();
+  };
+
+  worker.postMessage(0);
+}
diff --git a/dom/url/tests/jsm_url_worker.js b/dom/url/tests/jsm_url_worker.js
new file mode 100644
index 000000000..539ace40d
--- /dev/null
+++ b/dom/url/tests/jsm_url_worker.js
@@ -0,0 +1,83 @@
+onmessage = function(event) {
+  if (event.data != 0) {
+    var worker = new Worker('jsm_url_worker.js');
+    worker.onmessage = function(event) {
+      postMessage(event.data);
+    }
+
+    worker.postMessage(event.data - 1);
+    return;
+  }
+
+  status = false;
+  try {
+    if ((URL instanceof Object)) {
+      status = true;
+    }
+  } catch(e) {
+  }
+
+  postMessage({type: 'status', status: status, msg: 'URL object:' + URL});
+
+  status = false;
+  var blob = null;
+  try {
+    blob = new Blob([]);
+    status = true;
+  } catch(e) {
+  }
+
+  postMessage({type: 'status', status: status, msg: 'Blob:' + blob});
+
+  status = false;
+  var url = null;
+  try {
+    url = URL.createObjectURL(blob);
+    status = true;
+  } catch(e) {
+  }
+
+  postMessage({type: 'status', status: status, msg: 'Blob URL:' + url});
+
+  status = false;
+  try {
+    URL.revokeObjectURL(url);
+    status = true;
+  } catch(e) {
+  }
+
+  postMessage({type: 'status', status: status, msg: 'Blob Revoke URL'});
+
+  status = false;
+  var url = null;
+  try {
+    url = URL.createObjectURL(true);
+  } catch(e) {
+    status = true;
+  }
+
+  postMessage({type: 'status', status: status, msg: 'CreateObjectURL should fail if the arg is not a blob'});
+
+  status = false;
+  var url = null;
+  try {
+    url = URL.createObjectURL(blob);
+    status = true;
+  } catch(e) {
+  }
+
+  postMessage({type: 'status', status: status, msg: 'Blob URL2:' + url});
+
+  status = false;
+  try {
+    URL.createObjectURL(new Object());
+  } catch(e) {
+    status = true;
+  }
+
+  postMessage({type: 'status', status: status, msg: 'Exception wanted' });
+
+  postMessage({type: 'url', url: url});
+
+  postMessage({type: 'finish' });
+}
diff --git a/dom/url/tests/mochitest.ini b/dom/url/tests/mochitest.ini
new file mode 100644
index 000000000..3c641ba96
--- /dev/null
+++ b/dom/url/tests/mochitest.ini
@@ -0,0 +1,21 @@
+[DEFAULT]
+support-files =
+  url_worker.js
+  urlApi_worker.js
+  urlSearchParams_worker.js
+  url_exceptions_worker.js
+
+[test_url.html]
+[test_url_data.html]
+[test_url_empty_port.html]
+[test_url_malformedHost.html]
+[test_urlExceptions.html]
+[test_urlSearchParams.html]
+[test_urlSearchParams_utf8.html]
+[test_urlutils_stringify.html]
+[test_worker_url.html]
+[test_worker_urlApi.html]
+[test_worker_url_exceptions.html]
+[test_worker_urlSearchParams.html]
+[test_unknown_url_origin.html]
+[test_bloburl_location.html]
diff --git a/dom/url/tests/test_bloburl_location.html b/dom/url/tests/test_bloburl_location.html
new file mode 100644
index 000000000..3d190e125
--- /dev/null
+++ b/dom/url/tests/test_bloburl_location.html
@@ -0,0 +1,31 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test for blobURL in location</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">
+
+var expectedData = null;
+onmessage = function(e) {
+  if (expectedData === null) {
+    expectedData = e.data;
+  } else {
+    is(e.data, expectedData, "Pathname should be not be changed");
+    SimpleTest.finish();
+  }
+}
+
+var ifr = document.createElement('iframe');
+document.body.appendChild(ifr);
+
+ifr.src = "data:html,<script>location=URL.createObjectURL(new%20Blob(['<script>parent.postMessage(location.pathname,\"*\");location.pathname=\"foo\";parent.postMessage(location.pathname,\"*\");<\/s' +'cript>'], {type:\"text/html\"}));<\/script>";
+
+SimpleTest.waitForExplicitFinish();
+
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_bug883784.jsm b/dom/url/tests/test_bug883784.jsm
new file mode 100644
index 000000000..a5747817d
--- /dev/null
+++ b/dom/url/tests/test_bug883784.jsm
@@ -0,0 +1,42 @@
+this.EXPORTED_SYMBOLS = ["Test"];
+
+const { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
+Cu.importGlobalProperties(["URL"]);
+
+this.Test = {
+  start: function(ok, is, finish) {
+    let worker = new ChromeWorker("jsm_url_worker.js");
+    worker.onmessage = function(event) {
+      if (event.data.type == 'status') {
+        ok(event.data.status, event.data.msg);
+      } else if (event.data.type == 'url') {
+        var xhr = Components.classes["@mozilla.org/xmlextras/xmlhttprequest;1"]
+                  .createInstance(Components.interfaces.nsIXMLHttpRequest);
+        xhr.open('GET', event.data.url, false);
+        xhr.onreadystatechange = function() {
+          if (xhr.readyState == 4) {
+            ok(true, "Blob readable!");
+            URL.revokeObjectURL(event.data.url);
+            finish();
+          }
+        }
+        xhr.onerror = function() {
+          ok(false, "Blob unreadable, should not happen!");
+          URL.revokeObjectURL(event.data.url);
+          finish();
+        }
+        xhr.send();
+      }
+    };
+
+    var self = this;
+    worker.onerror = function(event) {
+      is(event.target, worker);
+      ok(false, "Worker had an error: " + event.data);
+      self.worker.terminate();
+      finish();
+    };
+
+    worker.postMessage(0);
+  }
+};
diff --git a/dom/url/tests/test_bug883784.xul b/dom/url/tests/test_bug883784.xul
new file mode 100644
index 000000000..4fdcf5eb1
--- /dev/null
+++ b/dom/url/tests/test_bug883784.xul
@@ -0,0 +1,36 @@
+<?xml version="1.0"?>
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<window title="DOM Worker Threads Test"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="test();">
+
+  <script type="application/javascript"
+          src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script type="application/javascript"
+          src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"/>
+  <script type="application/javascript" src="chrome://mochitests/content/chrome/dom/workers/test/dom_worker_helper.js"/>
+
+  <script type="application/javascript">
+  <![CDATA[
+
+    function test()
+    {
+      waitForWorkerFinish();
+
+      Components.utils.import("chrome://mochitests/content/chrome/dom/url/tests/test_bug883784.jsm");
+      Test.start(ok, is, finish);
+    }
+
+  ]]>
+  </script>
+
+  <body xmlns="http://www.w3.org/1999/xhtml">
+    <p id="display"></p>
+    <div id="content" style="display:none;"></div>
+    <pre id="test"></pre>
+  </body>
+  <label id="test-result"/>
+</window>
diff --git a/dom/url/tests/test_unknown_url_origin.html b/dom/url/tests/test_unknown_url_origin.html
new file mode 100644
index 000000000..052bb6ca4
--- /dev/null
+++ b/dom/url/tests/test_unknown_url_origin.html
@@ -0,0 +1,17 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test for unknwon URL.origin</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">
+
+  is ((new URL("blob:http://foo.com/bar")).origin, "http://foo.com");
+  is ((new URL("blob:blob:http://foo.com/bar")).origin, "http://foo.com");
+
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_url.html b/dom/url/tests/test_url.html
new file mode 100644
index 000000000..3f3f727d6
--- /dev/null
+++ b/dom/url/tests/test_url.html
@@ -0,0 +1,442 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test URL API</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=887364">Mozilla Bug 887364</a>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=991471">Mozilla Bug 991471</a>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=996055">Mozilla Bug 996055</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+  <script type="application/javascript">
+
+  /** Test for Bug 887364 **/
+  ok("URL" in window, "window.URL exists");
+
+  var tests = [
+    { url: 'http://www.abc.com',
+      base: undefined,
+      error: false,
+      href: 'http://www.abc.com/',
+      origin: 'http://www.abc.com',
+      protocol: 'http:',
+      username: '',
+      password: '',
+      host: 'www.abc.com',
+      hostname: 'www.abc.com',
+      port: '',
+      pathname: '/',
+      search: '',
+      hash: ''
+    },
+    { url: 'ftp://auser:apw@www.abc.com',
+      base: undefined,
+      error: false,
+      href: 'ftp://auser:apw@www.abc.com/',
+      origin: 'ftp://www.abc.com',
+      protocol: 'ftp:',
+      username: 'auser',
+      password: 'apw',
+      host: 'www.abc.com',
+      hostname: 'www.abc.com',
+      port: '',
+      pathname: '/',
+      search: '',
+      hash: ''
+    },
+    { url: 'http://www.abc.com:90/apath/',
+      base: undefined,
+      error: false,
+      href: 'http://www.abc.com:90/apath/',
+      origin: 'http://www.abc.com:90',
+      protocol: 'http:',
+      username: '',
+      password: '',
+      host: 'www.abc.com:90',
+      hostname: 'www.abc.com',
+      port: '90',
+      pathname: '/apath/',
+      search: '',
+      hash: ''
+    },
+    { url: 'http://www.abc.com/apath/afile.txt#ahash',
+      base: undefined,
+      error: false,
+      href: 'http://www.abc.com/apath/afile.txt#ahash',
+      origin: 'http://www.abc.com',
+      protocol: 'http:',
+      username: '',
+      password: '',
+      host: 'www.abc.com',
+      hostname: 'www.abc.com',
+      port: '',
+      pathname: '/apath/afile.txt',
+      search: '',
+      hash: '#ahash'
+    },
+    { url: 'http://example.com/?test#hash',
+      base: undefined,
+      error: false,
+      href: 'http://example.com/?test#hash',
+      origin: 'http://example.com',
+      protocol: 'http:',
+      username: '',
+      password: '',
+      host: 'example.com',
+      hostname: 'example.com',
+      port: '',
+      pathname: '/',
+      search: '?test',
+      hash: '#hash'
+    },
+    { url: 'http://example.com/?test',
+      base: undefined,
+      error: false,
+      href: 'http://example.com/?test',
+      origin: 'http://example.com',
+      protocol: 'http:',
+      username: '',
+      password: '',
+      host: 'example.com',
+      hostname: 'example.com',
+      port: '',
+      pathname: '/',
+      search: '?test',
+      hash: ''
+    },
+    { url: 'http://example.com/carrot#question%3f',
+      base: undefined,
+      error: false,
+      hash: '#question%3f'
+    },
+    { url: 'https://example.com:4443?',
+      base: undefined,
+      error: false,
+      protocol: 'https:',
+      port: '4443',
+      pathname: '/',
+      hash: '',
+      search: ''
+    },
+    { url: 'http://www.abc.com/apath/afile.txt#ahash?asearch',
+      base: undefined,
+      error: false,
+      href: 'http://www.abc.com/apath/afile.txt#ahash?asearch',
+      protocol: 'http:',
+      pathname: '/apath/afile.txt',
+      hash: '#ahash?asearch',
+      search: ''
+    },
+    { url: 'http://www.abc.com/apath/afile.txt?asearch#ahash',
+      base: undefined,
+      error: false,
+      href: 'http://www.abc.com/apath/afile.txt?asearch#ahash',
+      protocol: 'http:',
+      pathname: '/apath/afile.txt',
+      hash: '#ahash',
+      search: '?asearch'
+    },
+    { url: 'http://abc.com/apath/afile.txt?#ahash',
+      base: undefined,
+      error: false,
+      pathname: '/apath/afile.txt',
+      hash: '#ahash',
+      search: ''
+    },
+    { url: 'http://auser:apassword@www.abc.com:90/apath/afile.txt?asearch#ahash',
+      base: undefined,
+      error: false,
+      protocol: 'http:',
+      username: 'auser',
+      password: 'apassword',
+      host: 'www.abc.com:90',
+      hostname: 'www.abc.com',
+      port: '90',
+      pathname: '/apath/afile.txt',
+      hash: '#ahash',
+      search: '?asearch',
+      origin: 'http://www.abc.com:90'
+    },
+
+    { url: '/foo#bar',
+      base: 'www.test.org',
+      error: true,
+    },
+    { url: '/foo#bar',
+      base: null,
+      error: true,
+    },
+    { url: '/foo#bar',
+      base: 42,
+      error: true,
+    },
+    { url: 'ftp://ftp.something.net',
+      base: undefined,
+      error: false,
+      protocol: 'ftp:',
+    },
+    { url: 'file:///tmp/file',
+      base: undefined,
+      error: false,
+      protocol: 'file:',
+    },
+    { url: 'gopher://gopher.something.net',
+      base: undefined,
+      error: false,
+      protocol: 'gopher:',
+    },
+    { url: 'ws://ws.something.net',
+      base: undefined,
+      error: false,
+      protocol: 'ws:',
+    },
+    { url: 'wss://ws.something.net',
+      base: undefined,
+      error: false,
+      protocol: 'wss:',
+    },
+    { url: 'foo://foo.something.net',
+      base: undefined,
+      error: false,
+      protocol: 'foo:',
+    },
+
+    { url: 'about:blank',
+      base: undefined,
+      error: false,
+      protocol: 'about:',
+      pathname: 'blank',
+      skip_setters: false,
+    },
+
+    { url: 'foo:bar?what#yeah',
+      base: undefined,
+      error: false,
+      protocol: 'foo:',
+      pathname: 'bar',
+      search: '?what',
+      hash: '#yeah',
+      skip_setters: false,
+    },
+  ];
+
+  while(tests.length) {
+    var test = tests.shift();
+
+    var error = false;
+    var url;
+    try {
+      if (test.base) {
+        url = new URL(test.url, test.base);
+      } else {
+        url = new URL(test.url);
+      }
+    } catch(e) {
+      error = true;
+    }
+
+    is(test.error, error, "Error creating URL");
+    if (test.error) {
+      continue;
+    }
+
+    if ('href' in test) is(url.href, test.href, "href");
+    if ('origin' in test) is(url.origin, test.origin, "origin");
+    if ('protocol' in test) is(url.protocol, test.protocol, "protocol");
+    if ('username' in test) is(url.username, test.username, "username");
+    if ('password' in test) is(url.password, test.password, "password");
+    if ('host' in test) is(url.host, test.host, "host");
+    if ('hostname' in test) is(url.hostname, test.hostname, "hostname");
+    if ('port' in test) is(url.port, test.port, "port");
+    if ('pathname' in test) is(url.pathname, test.pathname, "pathname");
+    if ('search' in test) is(url.search, test.search, "search");
+    if ('hash' in test) is(url.hash, test.hash, "hash");
+
+    if ('skip_setters' in test && test.skip_setters == false) {
+      info("Skip setter methods for URL: " + test);
+      continue;
+    }
+
+    url = new URL('https://www.example.net/what#foo?bar');
+    ok(url, "Url exists!");
+
+    if ('href' in test) url.href = test.href;
+    if ('protocol' in test) url.protocol = test.protocol;
+    if ('username' in test && test.username) url.username = test.username;
+    if ('password' in test && test.password) url.password = test.password;
+    if ('host' in test) url.host = test.host;
+    if ('hostname' in test) url.hostname = test.hostname;
+    if ('port' in test) url.port = test.port;
+    if ('pathname' in test) url.pathname = test.pathname;
+    if ('search' in test) url.search = test.search;
+    if ('hash' in test) url.hash = test.hash;
+
+    if ('href' in test) is(url.href, test.href, "href");
+    if ('origin' in test) is(url.origin, test.origin, "origin");
+    if ('protocol' in test) is(url.protocol, test.protocol, "protocol");
+    if ('username' in test) is(url.username, test.username, "username");
+    if ('password' in test) is(url.password, test.password, "password");
+    if ('host' in test) is(url.host, test.host, "host");
+    if ('hostname' in test) is(test.hostname, url.hostname, "hostname");
+    if ('port' in test) is(test.port, url.port, "port");
+    if ('pathname' in test) is(test.pathname, url.pathname, "pathname");
+    if ('search' in test) is(test.search, url.search, "search");
+    if ('hash' in test) is(test.hash, url.hash, "hash");
+
+    if ('href' in test) is (test.href, url + '', 'stringify works');
+  }
+
+  </script>
+
+  <script>
+    /** Test for Bug 991471 **/
+    var url = new URL("http://localhost/");
+    url.hostname = "";
+    url.username = "tttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt";
+    url.hostname = "www.mozilla.org";
+    url.username = "";
+    url.hostname = "www.mozilla.org";
+    is(url.href, "http://www.mozilla.org/", "No parsing error with empty host");
+  </script>
+
+  <script>
+    /** Test for Bug 996055 **/
+    var url = new URL("http://localhost/");
+    url.hostname = "";
+    is(url.href, "http://localhost/", "Empty hostname is ignored");
+  </script>
+
+  <script>
+    /** Test for Bug 960014 **/
+    var url = new URL("http://localhost/");
+    url.hostname = "[2001::1]";
+    is(url.hostname, "[2001::1]", "IPv6 hostname");
+    is(url.href, "http://[2001::1]/");
+
+    url.hostname = "[::192.9.5.5]";
+    is(url.hostname, "[::192.9.5.5]", "IPv6 hostname");
+    is(url.href, "http://[::192.9.5.5]/");
+
+    url = new URL("http://localhost/");
+    url.hostname = "[::]";
+    is(url.hostname, "[::]", "IPv6 hostname");
+
+    url = new URL("http://localhost/");
+    url.host = "[2001::1]:30";
+    is(url.hostname, "[2001::1]", "IPv6 hostname");
+    is(url.port, "30", "Port");
+    is(url.host, "[2001::1]:30", "IPv6 host");
+
+    url = new URL("http://localhost/");
+    // This should silently fail since it's missing the brackets
+    url.hostname = "2001::1";
+    is(url.hostname, "localhost", "Setting bad hostname fails");
+  </script>
+
+  <script>
+    var blob = new Blob(['a']);
+    var url = URL.createObjectURL(blob);
+
+    var u = new URL(url);
+    ok(u.origin, 'http://mochi.test:8888', "The URL generated from a blob URI has an origin");
+  </script>
+
+  <script>
+    var blob = new Blob(['a']);
+    var url = URL.createObjectURL(blob);
+
+    var a = document.createElement('A');
+    a.href = url;
+    ok(a.origin, 'http://mochi.test:8888', "The 'a' element has the correct origin");
+  </script>
+
+  <script>
+    var blob = new Blob(['a']);
+    var url = URL.createObjectURL(blob);
+    URL.revokeObjectURL(url);
+    URL.revokeObjectURL(url);
+    ok(true, "Calling revokeObjectURL twice should be ok");
+  </script>
+
+  <script>
+    URL.revokeObjectURL('blob:something');
+    ok(true, "This should not throw.");
+  </script>
+
+  <script>
+    var base = new URL("http:\\\\test.com\\path/to\\file?query\\backslash#hash\\");
+    is(base.href, "http://test.com/path/to/file?query\\backslash#hash\\");
+
+    var url = new URL("..\\", base);
+    is(url.href, "http://test.com/path/");
+
+    url = new URL("\\test", base);
+    is(url.href, "http://test.com/test");
+
+    url = new URL("\\test\\", base);
+    is(url.href, "http://test.com/test/");
+
+    url = new URL("http://example.org/test", base);
+    is(url.href, "http://example.org/test");
+
+    url = new URL("ftp://tmp/test", base);
+    is(url.href, "ftp://tmp/test");
+
+    url = new URL("ftp:\\\\tmp\\test", base);
+    is(url.href, "ftp://tmp/test");
+
+    url = new URL("scheme://tmp\\test", base);
+    is(url.href, "scheme://tmp\\test");
+  </script>
+
+  <script>
+    var url = new URL("scheme:path/to/file?query#hash");
+    is(url.href, "scheme:path/to/file?query#hash");
+    is(url.pathname, "path/to/file");
+    is(url.search, "?query");
+    is(url.hash, "#hash");
+
+    // pathname cannot be overwritten.
+    url.pathname = "new/path?newquery#newhash";
+    is(url.href, "scheme:path/to/file?query#hash");
+
+    // don't escape '#' until we implement a spec-compliant parser.
+    url.search = "?newquery#newhash";
+    is(url.href, "scheme:path/to/file?newquery#newhash#hash");
+
+    // nulls get encoded, whitespace gets stripped
+    url = new URL("scheme:pa\0\nth/to/fi\0\nle?qu\0\nery#ha\0\nsh");
+    is(url.href, "scheme:pa%00th/to/fi%00le?qu%00ery#ha%00sh");
+
+    url.search = "new\0\nquery";
+    is(url.href, "scheme:pa%00th/to/fi%00le?new%00%0Aquery#ha%00sh");
+    url.hash = "new\0\nhash";
+    is(url.href, "scheme:pa%00th/to/fi%00le?new%00%0Aquery#new%00%0Ahash");
+
+    url = new URL("scheme:path#hash");
+    is(url.href, "scheme:path#hash");
+    url.search = "query";
+    is(url.href, "scheme:path?query#hash");
+    url.hash = "";
+    is(url.href, "scheme:path?query");
+    url.hash = "newhash";
+    is(url.href, "scheme:path?query#newhash");
+    url.search = "";
+    is(url.href, "scheme:path#newhash");
+
+    // we don't implement a spec-compliant parser yet.
+    // make sure we are bug compatible with existing implementations.
+    url = new URL("data:text/html,<a href=\"http://example.org/?q\">Link</a>");
+    is(url.href, "data:text/html,<a%20href=\"http://example.org/?q\">Link</a>");
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_url.xul b/dom/url/tests/test_url.xul
new file mode 100644
index 000000000..026e9df93
--- /dev/null
+++ b/dom/url/tests/test_url.xul
@@ -0,0 +1,26 @@
+<?xml version="1.0"?>
+<?xml-stylesheet type="text/css" href="chrome://global/skin"?>
+<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>
+<window title="Test for URL API"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+  <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+
+  <!-- test results are displayed in the html:body -->
+  <body xmlns="http://www.w3.org/1999/xhtml">
+  </body>
+
+  <!-- test code goes here -->
+  <script type="application/javascript"><![CDATA[
+
+  /** Test for URL API. **/
+  const Cu = Components.utils;
+
+  // Import our test JSM. We first strip the filename off
+  // the chrome url, then append the jsm filename.
+  var base = /.*\//.exec(window.location.href)[0];
+  Cu.import(base + "file_url.jsm");
+
+  checkFromJSM(ok, is);
+
+  ]]></script>
+</window>
diff --git a/dom/url/tests/test_urlExceptions.html b/dom/url/tests/test_urlExceptions.html
new file mode 100644
index 000000000..b75c9d114
--- /dev/null
+++ b/dom/url/tests/test_urlExceptions.html
@@ -0,0 +1,57 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=926890
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 926890</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=926890">Mozilla Bug 926890</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+  <script type="application/javascript">
+
+  // URL.href throws
+  var url = new URL('http://www.example.com');
+  ok(url, "URL created");
+
+  try {
+    url.href = '42';
+    ok(false, "url.href = 42 should throw");
+  } catch(e) {
+    ok(true, "url.href = 42 should throw");
+    ok(e instanceof TypeError, "error type typeError");
+  }
+
+  url.href = 'http://www.example.org';
+  ok(true, "url.href should not throw");
+
+  try {
+    new URL('42');
+    ok(false, "new URL(42) should throw");
+  } catch(e) {
+    ok(true, "new URL(42) should throw");
+    ok(e instanceof TypeError, "error type typeError");
+  }
+
+  try {
+    new URL('http://www.example.com', '42');
+    ok(false, "new URL(something, 42) should throw");
+  } catch(e) {
+    ok(true, "new URL(something, 42) should throw");
+    ok(e instanceof TypeError, "error type typeError");
+  }
+
+  </script>
+</body>
+</html>
+
diff --git a/dom/url/tests/test_urlSearchParams.html b/dom/url/tests/test_urlSearchParams.html
new file mode 100644
index 000000000..d5a65e1c5
--- /dev/null
+++ b/dom/url/tests/test_urlSearchParams.html
@@ -0,0 +1,334 @@
+
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=887836
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for URLSearchParams</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=887836">Mozilla Bug 887836</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+<script type="application/javascript">
+
+  /** Test for Bug 887836 **/
+  ok("URLSearchParams" in window, "window.URLSearchParams exists");
+
+  function testSimpleURLSearchParams() {
+    var u = new URLSearchParams();
+    ok(u, "URLSearchParams created");
+    is(u.has('foo'), false, 'URLSearchParams.has(foo)');
+    is(u.get('foo'), null, 'URLSearchParams.get(foo)');
+    is(u.getAll('foo').length, 0, 'URLSearchParams.getAll(foo)');
+
+    u.append('foo', 'bar');
+    is(u.has('foo'), true, 'URLSearchParams.has(foo)');
+    is(u.get('foo'), 'bar', 'URLSearchParams.get(foo)');
+    is(u.getAll('foo').length, 1, 'URLSearchParams.getAll(foo)');
+
+    u.set('foo', 'bar2');
+    is(u.get('foo'), 'bar2', 'URLSearchParams.get(foo)');
+    is(u.getAll('foo').length, 1, 'URLSearchParams.getAll(foo)');
+
+    is(u + "", "foo=bar2", "stringifier");
+
+    u.delete('foo');
+
+    runTest();
+  }
+
+  function testCopyURLSearchParams() {
+    var u = new URLSearchParams();
+    ok(u, "URLSearchParams created");
+    u.append('foo', 'bar');
+
+    var uu = new URLSearchParams(u);
+    is(uu.get('foo'), 'bar', 'uu.get()');
+
+    u.append('foo', 'bar2');
+    is(u.getAll('foo').length, 2, "u.getAll()");
+    is(uu.getAll('foo').length, 1, "uu.getAll()");
+
+    runTest();
+  }
+
+  function testParserURLSearchParams() {
+    var checks = [
+      { input: '', data: {} },
+      { input: 'a', data: { 'a' : [''] } },
+      { input: 'a=b', data: { 'a' : ['b'] } },
+      { input: 'a=', data: { 'a' : [''] } },
+      { input: '=b', data: { '' : ['b'] } },
+      { input: '&', data: {} },
+      { input: '&a', data: { 'a' : [''] } },
+      { input: 'a&', data: { 'a' : [''] } },
+      { input: 'a&a', data: { 'a' : ['', ''] } },
+      { input: 'a&b&c', data: { 'a' : [''], 'b' : [''], 'c' : [''] } },
+      { input: 'a=b&c=d', data: { 'a' : ['b'], 'c' : ['d'] } },
+      { input: 'a=b&c=d&', data: { 'a' : ['b'], 'c' : ['d'] } },
+      { input: '&&&a=b&&&&c=d&', data: { 'a' : ['b'], 'c' : ['d'] } },
+      { input: 'a=a&a=b&a=c', data: { 'a' : ['a', 'b', 'c'] } },
+      { input: 'a==a', data: { 'a' : ['=a'] } },
+      { input: 'a=a+b+c+d', data: { 'a' : ['a b c d'] } },
+      { input: '%=a', data: { '%' : ['a'] } },
+      { input: '%a=a', data: { '%a' : ['a'] } },
+      { input: '%a_=a', data: { '%a_' : ['a'] } },
+      { input: '%61=a', data: { 'a' : ['a'] } },
+      { input: '%=a', data: { '%' : ['a'] } },
+      { input: '%a=a', data: { '%a' : ['a'] } },
+      { input: '%a_=a', data: { '%a_' : ['a'] } },
+      { input: '%61=a', data: { 'a' : ['a'] } },
+      { input: '%61+%4d%4D=', data: { 'a MM' : [''] } },
+      { input: '?a=1', data: { 'a' : ['1'] } },
+      { input: '?', data: {} },
+      { input: '?=b', data: { '' : ['b'] } },
+    ];
+
+    for (var i = 0; i < checks.length; ++i) {
+      var u = new URLSearchParams(checks[i].input);
+
+      var count = 0;
+      for (var key in checks[i].data) {
+        ++count;
+        ok(u.has(key), "key " + key + " found");
+
+        var all = u.getAll(key);
+        is(all.length, checks[i].data[key].length, "same number of elements");
+
+        for (var k = 0; k < all.length; ++k) {
+          is(all[k], checks[i].data[key][k], "value matches");
+        }
+      }
+    }
+
+    runTest();
+  }
+
+  function testURL() {
+    var url = new URL('http://www.example.net?a=b&c=d');
+    ok(url.searchParams, "URL searchParams exists!");
+    ok(url.searchParams.has('a'), "URL.searchParams.has('a')");
+    is(url.searchParams.get('a'), 'b', "URL.searchParams.get('a')");
+    ok(url.searchParams.has('c'), "URL.searchParams.has('c')");
+    is(url.searchParams.get('c'), 'd', "URL.searchParams.get('c')");
+
+    url.searchParams.set('e', 'f');
+    ok(url.href.indexOf('e=f') != 1, 'URL right');
+
+    runTest();
+  }
+
+  function testEncoding() {
+    var encoding = [ [ '1', '1' ],
+                     [ 'a b', 'a+b' ],
+                     [ '<>', '%3C%3E' ],
+                     [ '\u0541', '%D5%81'] ];
+
+    for (var i = 0; i < encoding.length; ++i) {
+      var url = new URL('http://www.example.net');
+      url.searchParams.set('a', encoding[i][0]);
+      is(url.href, 'http://www.example.net/?a=' + encoding[i][1]);
+
+      var url2 = new URL(url.href);
+      is(url2.searchParams.get('a'), encoding[i][0], 'a is still there');
+    }
+
+    runTest();
+  }
+
+  function testOrdering() {
+    var a = new URLSearchParams("a=1&a=2&b=3&c=4&c=5&a=6");
+    is(a.toString(), "a=1&a=2&b=3&c=4&c=5&a=6", "Order is correct");
+    is(a.getAll('a').length, 3, "Correct length of getAll()");
+
+    var b = new URLSearchParams();
+    b.append('a', '1');
+    b.append('b', '2');
+    b.append('a', '3');
+    is(b.toString(), "a=1&b=2&a=3", "Order is correct");
+    is(b.getAll('a').length, 2, "Correct length of getAll()");
+
+    runTest();
+  }
+
+  function testDelete() {
+    var a = new URLSearchParams("a=1&a=2&b=3&c=4&c=5&a=6");
+    is(a.toString(), "a=1&a=2&b=3&c=4&c=5&a=6", "Order is correct");
+    is(a.getAll('a').length, 3, "Correct length of getAll()");
+
+    a.delete('a');
+    is(a.getAll('a').length, 0, "Correct length of getAll()");
+    is(a.toString(), "b=3&c=4&c=5", "Order is correct");
+
+    runTest();
+  }
+
+  function testGetNULL() {
+      
+    var u = new URLSearchParams();
+    is(typeof u.get(''), "object", "typeof URL.searchParams.get('')");
+    is(u.get(''), null, "URL.searchParams.get('') should be null");
+
+    var url = new URL('http://www.example.net?a=b');
+    is(url.searchParams.get('b'), null, "URL.searchParams.get('b') should be null");
+    is(url.searchParams.get('a'), 'b', "URL.searchParams.get('a')");
+
+    runTest();
+  }
+
+  function testSet() {
+    var u = new URLSearchParams();
+    u.set('a','b');
+    u.set('e','c');
+    u.set('i','d');
+    u.set('o','f');
+    u.set('u','g');
+
+    is(u.get('a'), 'b', "URL.searchParams.get('a') should return b");
+    is(u.getAll('a').length, 1, "URLSearchParams.getAll('a').length should be 1");
+
+    u.set('a','h1');
+    u.set('a','h2');
+    u.set('a','h3');
+    u.set('a','h4');
+    is(u.get('a'), 'h4', "URL.searchParams.get('a') should return h4");
+    is(u.getAll('a').length, 1, "URLSearchParams.getAll('a').length should be 1");
+
+    is(u.get('e'), 'c', "URL.searchParams.get('e') should return c");
+    is(u.get('i'), 'd', "URL.searchParams.get('i') should return d");
+    is(u.get('o'), 'f', "URL.searchParams.get('o') should return f");
+    is(u.get('u'), 'g', "URL.searchParams.get('u') should return g");
+
+    is(u.getAll('e').length, 1, "URLSearchParams.getAll('e').length should be 1");
+    is(u.getAll('i').length, 1, "URLSearchParams.getAll('i').length should be 1");
+    is(u.getAll('o').length, 1, "URLSearchParams.getAll('o').length should be 1");
+    is(u.getAll('u').length, 1, "URLSearchParams.getAll('u').length should be 1");
+
+    u = new URLSearchParams("name1=value1&name1=value2&name1=value3");
+    is(u.get('name1'), 'value1', "URL.searchParams.get('name1') should return value1");
+    is(u.getAll('name1').length, 3, "URLSearchParams.getAll('name1').length should be 3");
+    u.set('name1','firstPair');
+    is(u.get('name1'), 'firstPair', "URL.searchParams.get('name1') should return firstPair");
+    is(u.getAll('name1').length, 1, "URLSearchParams.getAll('name1').length should be 1");
+
+    runTest();
+  }
+
+  function testIterable() {
+    var u = new URLSearchParams();
+    u.set('1','2');
+    u.set('2','4');
+    u.set('3','6');
+    u.set('4','8');
+    u.set('5','10');
+
+    var key_iter = u.keys();
+    var value_iter = u.values();
+    var entries_iter = u.entries();
+    for (var i = 0; i < 5; ++i) {
+      var v = i + 1;
+      var key = key_iter.next();
+      var value = value_iter.next();
+      var entry = entries_iter.next();
+      is(key.value, v.toString(), "Correct Key iterator: " + v.toString());
+      ok(!key.done, "Key.done is false");
+      is(value.value, (v * 2).toString(), "Correct Value iterator: " + (v * 2).toString());
+      ok(!value.done, "Value.done is false");
+      is(entry.value[0], v.toString(), "Correct Entry 0 iterator: " + v.toString());
+      is(entry.value[1], (v * 2).toString(), "Correct Entry 1 iterator: " + (v * 2).toString());
+      ok(!entry.done, "Entry.done is false");
+    }
+
+    var last = key_iter.next();
+    ok(last.done, "Nothing more to read.");
+    is(last.value, undefined, "Undefined is the last key");
+
+    last = value_iter.next();
+    ok(last.done, "Nothing more to read.");
+    is(last.value, undefined, "Undefined is the last value");
+
+    last = entries_iter.next();
+    ok(last.done, "Nothing more to read.");
+
+    key_iter = u.keys();
+    key_iter.next();
+    key_iter.next();
+    u.delete('1');
+    u.delete('2');
+    u.delete('3');
+    u.delete('4');
+    u.delete('5');
+
+    last = key_iter.next();
+    ok(last.done, "Nothing more to read.");
+    is(last.value, undefined, "Undefined is the last key");
+
+    runTest();
+  }
+
+  function testZeroHandling() {
+    var u = new URLSearchParams;
+    u.set("a", "b\0c");
+    u.set("d\0e", "f");
+    u.set("g\0h", "i\0j");
+    is(u.toString(), "a=b%00c&d%00e=f&g%00h=i%00j",
+       "Should encode U+0000 as %00");
+
+    runTest();
+  }
+
+  function testCopyConstructor() {
+    var url = new URL("http://example.com/");
+    var p = url.searchParams;
+    var q = new URLSearchParams(p);
+    q.set("a", "b");
+    is(url.href, "http://example.com/",
+       "Messing with copy of URLSearchParams should not affect URL");
+    p.set("c", "d");
+    is(url.href, "http://example.com/?c=d",
+       "Messing with URLSearchParams should affect URL");
+
+    runTest();
+  }
+
+  var tests = [
+    testSimpleURLSearchParams,
+    testCopyURLSearchParams,
+    testParserURLSearchParams,
+    testURL,
+    testEncoding,
+    testOrdering,
+    testDelete,
+    testGetNULL,
+    testSet,
+    testIterable,
+    testZeroHandling,
+    testCopyConstructor,
+  ];
+
+  function runTest() {
+    if (!tests.length) {
+      SimpleTest.finish();
+      return;
+    }
+
+    var test = tests.shift();
+    test();
+  }
+
+  SimpleTest.waitForExplicitFinish();
+  runTest();
+
+</script>
+</body>
+</html>
diff --git a/dom/url/tests/test_urlSearchParams_utf8.html b/dom/url/tests/test_urlSearchParams_utf8.html
new file mode 100644
index 000000000..22c85de45
--- /dev/null
+++ b/dom/url/tests/test_urlSearchParams_utf8.html
@@ -0,0 +1,40 @@
+
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1032511
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1032511</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1032511">Mozilla Bug 1032511</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+<a href="http://www.example.net?a=b&c=d" id="anchor">foobar</a>
+<area href="http://www.example.net?a=b&c=d" id="area">foobar</area>
+<script type="application/javascript">
+
+  /** Test for Bug 1032511 **/
+  var a = new URLSearchParams("%e2");
+  ok(a, "a exists");
+  is(a.toString(), '=', "The value should be here.");
+
+  a = new URLSearchParams("a%e2");
+  // This is a known decoder bug that fails to emit a REPLACEMENT CHARACTER.
+  is(a.toString(), 'a=', "The value should be here.");
+
+  a = new URLSearchParams("a%e2b");
+  is(a.toString(), 'a%EF%BF%BDb=', "The value should be here.");
+
+</script>
+</body>
+</html>
diff --git a/dom/url/tests/test_url_data.html b/dom/url/tests/test_url_data.html
new file mode 100644
index 000000000..082128f6d
--- /dev/null
+++ b/dom/url/tests/test_url_data.html
@@ -0,0 +1,37 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test URL API - data:plain</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1018682">Mozilla Bug 1018682</a>
+
+<script type="application/javascript">
+
+var base = new URL("data:text/plain,");
+
+base.protocol = "chrome:";
+is(base.protocol, 'data:', "The protocol should not change from data to chrome.");
+
+try {
+  var relative = new URL("a", base);
+  ok(false, "Relative URL from a data:text/plain should not work.");
+} catch(e) {
+  ok(true, "Relative URL from a data:text/plain should not work.");
+}
+
+base.protocol = "http:";
+ok(true, "Protocol: http changed");
+is(base.href, "http://text/plain,", "Base URL is correct");
+
+var relative = new URL("a", base);
+ok(relative, "This works.");
+is(relative.href, "http://text/a", "Relative URL is correct");
+
+</script>
+
+</body>
+</html>
diff --git a/dom/url/tests/test_url_empty_port.html b/dom/url/tests/test_url_empty_port.html
new file mode 100644
index 000000000..f3169730c
--- /dev/null
+++ b/dom/url/tests/test_url_empty_port.html
@@ -0,0 +1,53 @@
+
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=930450
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 930450</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=930450">Mozilla Bug 930450</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+  <a id="link" href="http://www.example.com:8080">foobar</a>
+  <area id="area" href="http://www.example.com:8080" />
+  <script type="application/javascript">
+
+  var url = new URL('http://www.example.com:8080');
+  is(url.port, '8080', 'URL.port is 8080');
+  url.port = '';
+  is(url.port, '', 'URL.port is \'\'');
+  url.port = 0;
+  is(url.port, '0', 'URL.port is 0');
+
+  var link = document.getElementById("link");
+  is(link.port, '8080', 'URL.port is 8080');
+  link.port = '';
+  is(link.href, 'http://www.example.com/', "link.href matches");
+  is(link.port, '', 'URL.port is \'\'');
+  link.port = 0;
+  is(link.href, 'http://www.example.com:0/', "link.href matches");
+  is(link.port, '0', 'URL.port is 0');
+
+  var area = document.getElementById("area");
+  is(area.port, '8080', 'URL.port is 8080');
+  area.port = '';
+  is(area.href, 'http://www.example.com/', "area.href matches");
+  is(area.port, '', 'URL.port is \'\'');
+  area.port = 0;
+  is(area.href, 'http://www.example.com:0/', "area.href matches");
+  is(area.port, '0', 'URL.port is 0');
+
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_url_malformedHost.html b/dom/url/tests/test_url_malformedHost.html
new file mode 100644
index 000000000..5b813b817
--- /dev/null
+++ b/dom/url/tests/test_url_malformedHost.html
@@ -0,0 +1,48 @@
+
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1020041
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1020041</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1020041">Mozilla Bug 1020041</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+  <a id="link" href="http://www.example.com:8080">foobar</a>
+  <area id="area" href="http://www.example.com:8080" />
+  <script type="application/javascript">
+
+  var tests = [
+    { host: '?', expected: 'www.example.com' },
+    { host: 'what?' , expected: 'what' },
+    { host: 'so what' , expected: 'www.example.com' },
+    { host: 'aa#bb' , expected: 'aa' },
+    { host: 'a/b' , expected: 'a' },
+    { host: 'a\\b', expected: 'a' },
+    { host: '[2001::1]#bla:10', expected: '[2001::1]'}
+  ];
+
+  for (var i = 0; i < tests.length; ++i) {
+    var url = new URL('http://www.example.com');
+    url.host = tests[i].host;
+    is (url.host, tests[i].expected, "URL.host is: " + url.host);
+
+    url = new URL('http://www.example.com');
+    url.hostname = tests[i].host;
+    is (url.hostname, tests[i].expected, "URL.hostname is: " + url.host);
+  }
+
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_urlutils_stringify.html b/dom/url/tests/test_urlutils_stringify.html
new file mode 100644
index 000000000..a2b32d45f
--- /dev/null
+++ b/dom/url/tests/test_urlutils_stringify.html
@@ -0,0 +1,38 @@
+
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=959190
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 959190</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=959190">Mozilla Bug 959190</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe name="x" id="x"></iframe>
+  <iframe name="y" id="y"></iframe>
+</div>
+<pre id="test">
+</pre>
+  <a id="link" href="http://www.example.com:8080">foobar</a>
+  <area id="area" href="http://www.example.com:8080" />
+  <script type="application/javascript">
+
+  var url = new URL('http://www.example.com:8080');
+  is(url + '', 'http://www.example.com:8080/', 'URL stringify');
+
+  var link = document.getElementById("link");
+  is(link + '', 'http://www.example.com:8080/', 'Anchor stringify');
+
+  var area = document.getElementById("area");
+  is(area + '', 'http://www.example.com:8080/', 'Area stringify');
+
+  is((location + '').indexOf('http://mochi.test:8888/tests/dom/url/tests/test_urlutils_stringify.html'), 0, 'Location stringify');
+  </script>
+</body>
+</html>
diff --git a/dom/url/tests/test_worker_url.html b/dom/url/tests/test_worker_url.html
new file mode 100644
index 000000000..6b010608c
--- /dev/null
+++ b/dom/url/tests/test_worker_url.html
@@ -0,0 +1,67 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for URL object 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"></pre>
+<script class="testbody" type="text/javascript">
+
+  var worker = new Worker("url_worker.js");
+
+  worker.onmessage = function(event) {
+    is(event.target, worker, "Correct worker");
+
+    if (event.data.type == 'finish') {
+      runTest();
+    } else if (event.data.type == 'status') {
+      ok(event.data.status, event.data.msg);
+    } else if (event.data.type == 'url') {
+      var xhr = new XMLHttpRequest();
+      xhr.open('GET', event.data.url, false);
+      xhr.onreadystatechange = function() {
+        if (xhr.readyState == 4) {
+          ok(true, "Blob readable!");
+        }
+      }
+      xhr.send();
+    }
+  };
+
+  worker.onerror = function(event) {
+    is(event.target, worker, "Correct worker");
+    ok(false, "Worker had an error: " + event.message);
+    SimpleTest.finish();
+  };
+
+  var tests = [
+    function() { worker.postMessage(0); },
+    function() { worker.postMessage(1); }
+  ];
+
+  function runTest() {
+    if (!tests.length) {
+      SimpleTest.finish();
+      return;
+    }
+
+    var test = tests.shift();
+    test();
+  }
+
+  runTest();
+  SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+</body>
+</html>
+
diff --git a/dom/url/tests/test_worker_url.xul b/dom/url/tests/test_worker_url.xul
new file mode 100644
index 000000000..2f4d79b2c
--- /dev/null
+++ b/dom/url/tests/test_worker_url.xul
@@ -0,0 +1,35 @@
+<?xml version="1.0"?>
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<window title="DOM Worker Threads Test"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+        onload="test();">
+
+  <script type="application/javascript"
+          src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>
+  <script type="application/javascript"
+          src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"/>
+
+  <script type="application/javascript">
+  <![CDATA[
+
+    function test()
+    {
+      SimpleTest.waitForExplicitFinish();
+
+      Components.utils.import("chrome://mochitests/content/chrome/dom/url/tests/file_worker_url.jsm");
+      checkFromJSM(ok, is, SimpleTest.finish);
+    }
+
+  ]]>
+  </script>
+
+  <body xmlns="http://www.w3.org/1999/xhtml">
+    <p id="display"></p>
+    <div id="content" style="display:none;"></div>
+    <pre id="test"></pre>
+  </body>
+  <label id="test-result"/>
+</window>
diff --git a/dom/url/tests/test_worker_urlApi.html b/dom/url/tests/test_worker_urlApi.html
new file mode 100644
index 000000000..654d2a197
--- /dev/null
+++ b/dom/url/tests/test_worker_urlApi.html
@@ -0,0 +1,45 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for URL API object 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"></pre>
+<script class="testbody" type="text/javascript">
+
+  var worker = new Worker("urlApi_worker.js");
+
+  worker.onmessage = function(event) {
+    is(event.target, worker);
+
+    if (event.data.type == 'finish') {
+      SimpleTest.finish();
+    } else if (event.data.type == 'status') {
+      ok(event.data.status, event.data.msg);
+    }
+  };
+
+  worker.onerror = function(event) {
+    is(event.target, worker);
+    ok(false, "Worker had an error: " + event.data);
+    SimpleTest.finish();
+  };
+
+  worker.postMessage(true);
+
+  SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+</body>
+</html>
+
+
diff --git a/dom/url/tests/test_worker_urlSearchParams.html b/dom/url/tests/test_worker_urlSearchParams.html
new file mode 100644
index 000000000..7578d5c35
--- /dev/null
+++ b/dom/url/tests/test_worker_urlSearchParams.html
@@ -0,0 +1,43 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for URLSearchParams object 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"></pre>
+<script class="testbody" type="text/javascript">
+
+  var worker = new Worker("urlSearchParams_worker.js");
+
+  worker.onmessage = function(event) {
+    is(event.target, worker);
+
+    if (event.data.type == 'finish') {
+      SimpleTest.finish();
+    } else if (event.data.type == 'status') {
+      ok(event.data.status, event.data.msg);
+    }
+  };
+
+  worker.onerror = function(event) {
+    is(event.target, worker);
+    ok(false, "Worker had an error: " + event.message);
+    SimpleTest.finish();
+  };
+
+  worker.postMessage(true);
+
+  SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/url/tests/test_worker_url_exceptions.html b/dom/url/tests/test_worker_url_exceptions.html
new file mode 100644
index 000000000..17993fe4d
--- /dev/null
+++ b/dom/url/tests/test_worker_url_exceptions.html
@@ -0,0 +1,44 @@
+<!--
+  Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for URL exceptions 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"></pre>
+<script class="testbody" type="text/javascript">
+
+  var worker = new Worker("url_exceptions_worker.js");
+
+  worker.onmessage = function(event) {
+    is(event.target, worker);
+
+    if (event.data.type == 'finish') {
+      SimpleTest.finish();
+    } else if (event.data.type == 'status') {
+      ok(event.data.status, event.data.msg);
+    }
+  };
+
+  worker.onerror = function(event) {
+    is(event.target, worker);
+    ok(false, "Worker had an error: " + event.message);
+    SimpleTest.finish();
+  };
+
+  worker.postMessage(0);
+  SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+</body>
+</html>
+
+
diff --git a/dom/url/tests/urlApi_worker.js b/dom/url/tests/urlApi_worker.js
new file mode 100644
index 000000000..a8b88e046
--- /dev/null
+++ b/dom/url/tests/urlApi_worker.js
@@ -0,0 +1,272 @@
+function ok(a, msg) {
+  dump("OK: " + !!a + "  =>  " + a + " " + msg + "\n");
+  postMessage({type: 'status', status: !!a, msg: a + ": " + msg });
+}
+
+function is(a, b, msg) {
+  dump("IS: " + (a===b) + "  =>  " + a + " | " + b + " " + msg + "\n");
+  postMessage({type: 'status', status: a === b, msg: a + " === " + b + ": " + msg });
+}
+
+onmessage = function() {
+  status = false;
+  try {
+    if ((URL instanceof Object)) {
+      status = true;
+    }
+  } catch(e) {
+  }
+
+  var tests = [
+    { url: 'http://www.abc.com',
+      base: undefined,
+      error: false,
+      href: 'http://www.abc.com/',
+      origin: 'http://www.abc.com',
+      protocol: 'http:',
+      username: '',
+      password: '',
+      host: 'www.abc.com',
+      hostname: 'www.abc.com',
+      port: '',
+      pathname: '/',
+      search: '',
+      hash: ''
+    },
+    { url: 'ftp://auser:apw@www.abc.com',
+      base: undefined,
+      error: false,
+      href: 'ftp://auser:apw@www.abc.com/',
+      origin: 'ftp://www.abc.com',
+      protocol: 'ftp:',
+      username: 'auser',
+      password: 'apw',
+      host: 'www.abc.com',
+      hostname: 'www.abc.com',
+      port: '',
+      pathname: '/',
+      search: '',
+      hash: ''
+    },
+    { url: 'http://www.abc.com:90/apath/',
+      base: undefined,
+      error: false,
+      href: 'http://www.abc.com:90/apath/',
+      origin: 'http://www.abc.com:90',
+      protocol: 'http:',
+      username: '',
+      password: '',
+      host: 'www.abc.com:90',
+      hostname: 'www.abc.com',
+      port: '90',
+      pathname: '/apath/',
+      search: '',
+      hash: ''
+    },
+    { url: 'http://www.abc.com/apath/afile.txt#ahash',
+      base: undefined,
+      error: false,
+      href: 'http://www.abc.com/apath/afile.txt#ahash',
+      origin: 'http://www.abc.com',
+      protocol: 'http:',
+      username: '',
+      password: '',
+      host: 'www.abc.com',
+      hostname: 'www.abc.com',
+      port: '',
+      pathname: '/apath/afile.txt',
+      search: '',
+      hash: '#ahash'
+    },
+    { url: 'http://example.com/?test#hash',
+      base: undefined,
+      error: false,
+      href: 'http://example.com/?test#hash',
+      origin: 'http://example.com',
+      protocol: 'http:',
+      username: '',
+      password: '',
+      host: 'example.com',
+      hostname: 'example.com',
+      port: '',
+      pathname: '/',
+      search: '?test',
+      hash: '#hash'
+    },
+    { url: 'http://example.com/?test',
+      base: undefined,
+      error: false,
+      href: 'http://example.com/?test',
+      origin: 'http://example.com',
+      protocol: 'http:',
+      username: '',
+      password: '',
+      host: 'example.com',
+      hostname: 'example.com',
+      port: '',
+      pathname: '/',
+      search: '?test',
+      hash: ''
+    },
+    { url: 'http://example.com/carrot#question%3f',
+      base: undefined,
+      error: false,
+      hash: '#question%3f'
+    },
+    { url: 'https://example.com:4443?',
+      base: undefined,
+      error: false,
+      protocol: 'https:',
+      port: '4443',
+      pathname: '/',
+      hash: '',
+      search: ''
+    },
+    { url: 'http://www.abc.com/apath/afile.txt#ahash?asearch',
+      base: undefined,
+      error: false,
+      href: 'http://www.abc.com/apath/afile.txt#ahash?asearch',
+      protocol: 'http:',
+      pathname: '/apath/afile.txt',
+      hash: '#ahash?asearch',
+      search: ''
+    },
+    { url: 'http://www.abc.com/apath/afile.txt?asearch#ahash',
+      base: undefined,
+      error: false,
+      href: 'http://www.abc.com/apath/afile.txt?asearch#ahash',
+      protocol: 'http:',
+      pathname: '/apath/afile.txt',
+      hash: '#ahash',
+      search: '?asearch'
+    },
+    { url: 'http://abc.com/apath/afile.txt?#ahash',
+      base: undefined,
+      error: false,
+      pathname: '/apath/afile.txt',
+      hash: '#ahash',
+      search: ''
+    },
+    { url: 'http://auser:apassword@www.abc.com:90/apath/afile.txt?asearch#ahash',
+      base: undefined,
+      error: false,
+      protocol: 'http:',
+      username: 'auser',
+      password: 'apassword',
+      host: 'www.abc.com:90',
+      hostname: 'www.abc.com',
+      port: '90',
+      pathname: '/apath/afile.txt',
+      hash: '#ahash',
+      search: '?asearch',
+      origin: 'http://www.abc.com:90'
+    },
+
+    { url: '/foo#bar',
+      base: 'www.test.org',
+      error: true,
+    },
+    { url: '/foo#bar',
+      base: null,
+      error: true,
+    },
+    { url: '/foo#bar',
+      base: 42,
+      error: true,
+    },
+    { url: 'ftp://ftp.something.net',
+      base: undefined,
+      error: false,
+      protocol: 'ftp:',
+    },
+    { url: 'file:///tmp/file',
+      base: undefined,
+      error: false,
+      protocol: 'file:',
+    },
+    { url: 'gopher://gopher.something.net',
+      base: undefined,
+      error: false,
+      protocol: 'gopher:',
+    },
+    { url: 'ws://ws.something.net',
+      base: undefined,
+      error: false,
+      protocol: 'ws:',
+    },
+    { url: 'wss://ws.something.net',
+      base: undefined,
+      error: false,
+      protocol: 'wss:',
+    },
+    { url: 'foo://foo.something.net',
+      base: undefined,
+      error: false,
+      protocol: 'foo:',
+    },
+  ];
+
+  while(tests.length) {
+    var test = tests.shift();
+
+    var error = false;
+    var url;
+    try {
+      if (test.base) {
+        url = new URL(test.url, test.base);
+      } else {
+        url = new URL(test.url);
+      }
+    } catch(e) {
+      error = true;
+    }
+
+    is(test.error, error, "Error creating URL");
+    if (test.error) {
+      continue;
+    }
+
+    if ('href' in test) is(url.href, test.href, "href");
+    if ('origin' in test) is(url.origin, test.origin, "origin");
+    if ('protocol' in test) is(url.protocol, test.protocol, "protocol");
+    if ('username' in test) is(url.username, test.username, "username");
+    if ('password' in test) is(url.password, test.password, "password");
+    if ('host' in test) is(url.host, test.host, "host");
+    if ('hostname' in test) is(url.hostname, test.hostname, "hostname");
+    if ('port' in test) is(url.port, test.port, "port");
+    if ('pathname' in test) is(url.pathname, test.pathname, "pathname");
+    if ('search' in test) is(url.search, test.search, "search");
+    if ('hash' in test) is(url.hash, test.hash, "hash");
+
+    url = new URL('https://www.example.net/what#foo?bar');
+    ok(url, "Url exists!");
+
+    if ('href' in test) url.href = test.href;
+    if ('protocol' in test) url.protocol = test.protocol;
+    if ('username' in test && test.username) url.username = test.username;
+    if ('password' in test && test.password) url.password = test.password;
+    if ('host' in test) url.host = test.host;
+    if ('hostname' in test) url.hostname = test.hostname;
+    if ('port' in test) url.port = test.port;
+    if ('pathname' in test) url.pathname = test.pathname;
+    if ('search' in test) url.search = test.search;
+    if ('hash' in test) url.hash = test.hash;
+
+    if ('href' in test) is(url.href, test.href, "href");
+    if ('origin' in test) is(url.origin, test.origin, "origin");
+    if ('protocol' in test) is(url.protocol, test.protocol, "protocol");
+    if ('username' in test) is(url.username, test.username, "username");
+    if ('password' in test) is(url.password, test.password, "password");
+    if ('host' in test) is(url.host, test.host, "host");
+    if ('hostname' in test) is(test.hostname, url.hostname, "hostname");
+    if ('port' in test) is(test.port, url.port, "port");
+    if ('pathname' in test) is(test.pathname, url.pathname, "pathname");
+    if ('search' in test) is(test.search, url.search, "search");
+    if ('hash' in test) is(test.hash, url.hash, "hash");
+
+    if ('href' in test) is (test.href, url + '', 'stringify works');
+  }
+
+  postMessage({type: 'finish' });
+}
+
diff --git a/dom/url/tests/urlSearchParams_worker.js b/dom/url/tests/urlSearchParams_worker.js
new file mode 100644
index 000000000..03b104f3f
--- /dev/null
+++ b/dom/url/tests/urlSearchParams_worker.js
@@ -0,0 +1,162 @@
+function ok(a, msg) {
+  dump("OK: " + !!a + "  =>  " + a + " " + msg + "\n");
+  postMessage({type: 'status', status: !!a, msg: a + ": " + msg });
+}
+
+function is(a, b, msg) {
+  dump("IS: " + (a===b) + "  =>  " + a + " | " + b + " " + msg + "\n");
+  postMessage({type: 'status', status: a === b, msg: a + " === " + b + ": " + msg });
+}
+
+onmessage = function() {
+  status = false;
+  try {
+    if ((URLSearchParams instanceof Object)) {
+      status = true;
+    }
+  } catch(e) {
+  }
+  ok(status, "URLSearchParams in workers \\o/");
+
+  function testSimpleURLSearchParams() {
+    var u = new URLSearchParams();
+    ok(u, "URLSearchParams created");
+    is(u.has('foo'), false, 'URLSearchParams.has(foo)');
+    is(u.get('foo'), null, 'URLSearchParams.get(foo)');
+    is(u.getAll('foo').length, 0, 'URLSearchParams.getAll(foo)');
+
+    u.append('foo', 'bar');
+    is(u.has('foo'), true, 'URLSearchParams.has(foo)');
+    is(u.get('foo'), 'bar', 'URLSearchParams.get(foo)');
+    is(u.getAll('foo').length, 1, 'URLSearchParams.getAll(foo)');
+
+    u.set('foo', 'bar2');
+    is(u.get('foo'), 'bar2', 'URLSearchParams.get(foo)');
+    is(u.getAll('foo').length, 1, 'URLSearchParams.getAll(foo)');
+
+    is(u + "", "foo=bar2", "stringify");
+
+    u.delete('foo');
+
+    runTest();
+  }
+
+  function testCopyURLSearchParams() {
+    var u = new URLSearchParams();
+    ok(u, "URLSearchParams created");
+    u.append('foo', 'bar');
+
+    var uu = new URLSearchParams(u);
+    is(uu.get('foo'), 'bar', 'uu.get()');
+
+    u.append('foo', 'bar2');
+    is(u.getAll('foo').length, 2, "u.getAll()");
+    is(uu.getAll('foo').length, 1, "uu.getAll()");
+
+    runTest();
+  }
+
+  function testParserURLSearchParams() {
+    var checks = [
+      { input: '', data: {} },
+      { input: 'a', data: { 'a' : [''] } },
+      { input: 'a=b', data: { 'a' : ['b'] } },
+      { input: 'a=', data: { 'a' : [''] } },
+      { input: '=b', data: { '' : ['b'] } },
+      { input: '&', data: {} },
+      { input: '&a', data: { 'a' : [''] } },
+      { input: 'a&', data: { 'a' : [''] } },
+      { input: 'a&a', data: { 'a' : ['', ''] } },
+      { input: 'a&b&c', data: { 'a' : [''], 'b' : [''], 'c' : [''] } },
+      { input: 'a=b&c=d', data: { 'a' : ['b'], 'c' : ['d'] } },
+      { input: 'a=b&c=d&', data: { 'a' : ['b'], 'c' : ['d'] } },
+      { input: '&&&a=b&&&&c=d&', data: { 'a' : ['b'], 'c' : ['d'] } },
+      { input: 'a=a&a=b&a=c', data: { 'a' : ['a', 'b', 'c'] } },
+      { input: 'a==a', data: { 'a' : ['=a'] } },
+      { input: 'a=a+b+c+d', data: { 'a' : ['a b c d'] } },
+      { input: '%=a', data: { '%' : ['a'] } },
+      { input: '%a=a', data: { '%a' : ['a'] } },
+      { input: '%a_=a', data: { '%a_' : ['a'] } },
+      { input: '%61=a', data: { 'a' : ['a'] } },
+      { input: '%=a', data: { '%' : ['a'] } },
+      { input: '%a=a', data: { '%a' : ['a'] } },
+      { input: '%a_=a', data: { '%a_' : ['a'] } },
+      { input: '%61=a', data: { 'a' : ['a'] } },
+      { input: '%61+%4d%4D=', data: { 'a MM' : [''] } },
+      { input: '?a=1', data: { 'a' : ['1'] } },
+      { input: '?', data: {} },
+      { input: '?=b', data: { '' : ['b'] } },
+    ];
+
+    for (var i = 0; i < checks.length; ++i) {
+      var u = new URLSearchParams(checks[i].input);
+
+      var count = 0;
+      for (var key in checks[i].data) {
+        ++count;
+        ok(u.has(key), "key " + key + " found");
+
+        var all = u.getAll(key);
+        is(all.length, checks[i].data[key].length, "same number of elements");
+
+        for (var k = 0; k < all.length; ++k) {
+          is(all[k], checks[i].data[key][k], "value matches");
+        }
+      }
+    }
+
+    runTest();
+  }
+
+  function testURL() {
+    var url = new URL('http://www.example.net?a=b&c=d');
+    ok(url.searchParams, "URL searchParams exists!");
+    ok(url.searchParams.has('a'), "URL.searchParams.has('a')");
+    is(url.searchParams.get('a'), 'b', "URL.searchParams.get('a')");
+    ok(url.searchParams.has('c'), "URL.searchParams.has('c')");
+    is(url.searchParams.get('c'), 'd', "URL.searchParams.get('c')");
+
+    url.searchParams.set('e', 'f');
+    ok(url.href.indexOf('e=f') != 1, 'URL right');
+
+    runTest();
+  }
+
+  function testEncoding() {
+    var encoding = [ [ '1', '1' ],
+                     [ 'a b', 'a+b' ],
+                     [ '<>', '%3C%3E' ],
+                     [ '\u0541', '%D5%81'] ];
+
+    for (var i = 0; i < encoding.length; ++i) {
+      var url = new URL('http://www.example.net');
+      url.searchParams.set('a', encoding[i][0]);
+      is(url.href, 'http://www.example.net/?a=' + encoding[i][1]);
+
+      var url2 = new URL(url.href);
+      is(url2.searchParams.get('a'), encoding[i][0], 'a is still there');
+    }
+
+    runTest();
+  }
+
+  var tests = [
+    testSimpleURLSearchParams,
+    testCopyURLSearchParams,
+    testParserURLSearchParams,
+    testURL,
+    testEncoding,
+  ];
+
+  function runTest() {
+    if (!tests.length) {
+      postMessage({type: 'finish' });
+      return;
+    }
+
+    var test = tests.shift();
+    test();
+  }
+
+  runTest();
+}
diff --git a/dom/url/tests/url_exceptions_worker.js b/dom/url/tests/url_exceptions_worker.js
new file mode 100644
index 000000000..caefc2202
--- /dev/null
+++ b/dom/url/tests/url_exceptions_worker.js
@@ -0,0 +1,38 @@
+function ok(a, msg) {
+  postMessage({type: 'status', status: !!a, msg: msg });
+}
+
+onmessage = function(event) {
+  // URL.href throws
+  var url = new URL('http://www.example.com');
+  ok(url, "URL created");
+
+  var status = false;
+  try {
+    url.href = '42';
+  } catch(e) {
+    status = true;
+  }
+  ok(status, "url.href = 42 should throw");
+
+  url.href = 'http://www.example.org';
+  ok(true, "url.href should not throw");
+
+  status = false
+  try {
+    new URL('42');
+  } catch(e) {
+    status = true;
+  }
+  ok(status, "new URL(42) should throw");
+
+  status = false
+  try {
+    new URL('http://www.example.com', '42');
+  } catch(e) {
+    status = true;
+  }
+  ok(status, "new URL(something, 42) should throw");
+
+  postMessage({type: 'finish' });
+}
diff --git a/dom/url/tests/url_worker.js b/dom/url/tests/url_worker.js
new file mode 100644
index 000000000..2127acee7
--- /dev/null
+++ b/dom/url/tests/url_worker.js
@@ -0,0 +1,91 @@
+onmessage = function(event) {
+  if (event.data != 0) {
+    var worker = new Worker('url_worker.js');
+    worker.onmessage = function(event) {
+      postMessage(event.data);
+    }
+
+    worker.postMessage(event.data - 1);
+    return;
+  }
+
+  status = false;
+  try {
+    if ((URL instanceof Object)) {
+      status = true;
+    }
+  } catch(e) {
+  }
+
+  postMessage({type: 'status', status: status, msg: 'URL object:' + URL});
+
+  status = false;
+  var blob = null;
+  try {
+    blob = new Blob([]);
+    status = true;
+  } catch(e) {
+  }
+
+  postMessage({type: 'status', status: status, msg: 'Blob:' + blob});
+
+  status = false;
+  var url = null;
+  try {
+    url = URL.createObjectURL(blob);
+    status = true;
+  } catch(e) {
+  }
+
+  postMessage({type: 'status', status: status, msg: 'Blob URL:' + url});
+
+  status = false;
+  try {
+    URL.revokeObjectURL(url);
+    status = true;
+  } catch(e) {
+  }
+
+  postMessage({type: 'status', status: status, msg: 'Blob Revoke URL'});
+
+  status = false;
+  var url = null;
+  try {
+    url = URL.createObjectURL(true);
+  } catch(e) {
+    status = true;
+  }
+
+  postMessage({type: 'status', status: status, msg: 'CreateObjectURL should fail if the arg is not a blob'});
+
+  status = false;
+  var url = null;
+  try {
+    url = URL.createObjectURL(blob);
+    status = true;
+  } catch(e) {
+  }
+
+  postMessage({type: 'status', status: status, msg: 'Blob URL2:' + url});
+  postMessage({type: 'url', url: url});
+
+  status = false;
+  try {
+    URL.createObjectURL(new Object());
+  } catch(e) {
+    status = true;
+  }
+
+  postMessage({type: 'status', status: status, msg: 'Exception wanted' });
+
+  var blob = new Blob([123]);
+  var uri = URL.createObjectURL(blob);
+  postMessage({type: 'status', status: !!uri,
+               msg: "The URI has been generated from the blob"});
+
+  var u = new URL(uri);
+  postMessage({type: 'status', status: u.origin == 'http://mochi.test:8888',
+               msg: "The URL generated from a blob URI has an origin."});
+
+  postMessage({type: 'finish' });
+}