diff --git a/dom/quota/StorageManager.cpp b/dom/quota/StorageManager.cpp
index 4e9f0cf8c6b2..ba3b3fbd11ed 100644
--- a/dom/quota/StorageManager.cpp
+++ b/dom/quota/StorageManager.cpp
@@ -11,6 +11,7 @@
 #include "mozilla/dom/StorageManagerBinding.h"
 #include "mozilla/dom/WorkerPrivate.h"
 #include "mozilla/ErrorResult.h"
+#include "nsContentPermissionHelper.h"
 #include "nsIQuotaCallbacks.h"
 #include "nsIQuotaRequests.h"
 #include "nsPIDOMWindow.h"
@@ -22,10 +23,21 @@ namespace dom {
 
 namespace {
 
-// This class is used to get quota usage callback.
-class EstimateResolver final
-  : public nsIQuotaUsageCallback
+// This class is used to get quota usage, request persist and check persisted
+// status callbacks.
+class RequestResolver final
+  : public nsIQuotaCallback
+  , public nsIQuotaUsageCallback
 {
+public:
+  enum Type
+  {
+    Estimate,
+    Persist,
+    Persisted
+  };
+
+private:
   class FinishWorkerRunnable;
 
   // If this resolver was created for a window then mPromise must be non-null.
@@ -35,44 +47,69 @@ class EstimateResolver final
 
   nsresult mResultCode;
   StorageEstimate mStorageEstimate;
+  const Type mType;
+  bool mPersisted;
 
 public:
-  explicit EstimateResolver(Promise* aPromise)
+  RequestResolver(Type aType, Promise* aPromise)
     : mPromise(aPromise)
     , mResultCode(NS_OK)
+    , mType(aType)
+    , mPersisted(false)
   {
     MOZ_ASSERT(NS_IsMainThread());
     MOZ_ASSERT(aPromise);
   }
 
-  explicit EstimateResolver(PromiseWorkerProxy* aProxy)
+  RequestResolver(Type aType, PromiseWorkerProxy* aProxy)
     : mProxy(aProxy)
     , mResultCode(NS_OK)
+    , mType(aType)
+    , mPersisted(false)
   {
     MOZ_ASSERT(NS_IsMainThread());
     MOZ_ASSERT(aProxy);
   }
 
+  Type
+  GetType() const
+  {
+    return mType;
+  }
+
   void
-  ResolveOrReject(Promise* aPromise);
+  ResolveOrReject();
 
   NS_DECL_THREADSAFE_ISUPPORTS
-
+  NS_DECL_NSIQUOTACALLBACK
   NS_DECL_NSIQUOTAUSAGECALLBACK
 
 private:
-  ~EstimateResolver()
+  ~RequestResolver()
   { }
+
+  nsresult
+  GetStorageEstimate(nsIVariant* aResult);
+
+  nsresult
+  GetPersisted(nsIVariant* aResult);
+
+  template <typename T>
+  nsresult
+  OnCompleteOrUsageResult(T* aRequest);
+
+  nsresult
+  Finish();
 };
 
 // This class is used to return promise on worker thread.
-class EstimateResolver::FinishWorkerRunnable final
+class RequestResolver::FinishWorkerRunnable final
   : public WorkerRunnable
 {
-  RefPtr<EstimateResolver> mResolver;
+  RefPtr<RequestResolver> mResolver;
 
 public:
-  explicit FinishWorkerRunnable(EstimateResolver* aResolver)
+  explicit FinishWorkerRunnable(RequestResolver* aResolver)
     : WorkerRunnable(aResolver->mProxy->GetWorkerPrivate())
     , mResolver(aResolver)
   {
@@ -80,11 +117,11 @@ public:
     MOZ_ASSERT(aResolver);
   }
 
-  virtual bool
+  bool
   WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override;
 };
 
-class EstimateWorkerMainThreadRunnable
+class EstimateWorkerMainThreadRunnable final
   : public WorkerMainThreadRunnable
 {
   RefPtr<PromiseWorkerProxy> mProxy;
@@ -101,10 +138,69 @@ public:
     MOZ_ASSERT(aProxy);
   }
 
-  virtual bool
+  bool
   MainThreadRun() override;
 };
 
+class PersistedWorkerMainThreadRunnable final
+  : public WorkerMainThreadRunnable
+{
+  RefPtr<PromiseWorkerProxy> mProxy;
+
+public:
+  PersistedWorkerMainThreadRunnable(WorkerPrivate* aWorkerPrivate,
+                                    PromiseWorkerProxy* aProxy)
+    : WorkerMainThreadRunnable(aWorkerPrivate,
+                               NS_LITERAL_CSTRING("StorageManager :: Persisted"))
+    , mProxy(aProxy)
+  {
+    MOZ_ASSERT(aWorkerPrivate);
+    aWorkerPrivate->AssertIsOnWorkerThread();
+    MOZ_ASSERT(aProxy);
+  }
+
+  bool
+  MainThreadRun() override;
+};
+
+/*******************************************************************************
+ * PersistentStoragePermissionRequest
+ ******************************************************************************/
+
+class PersistentStoragePermissionRequest final
+  : public nsIContentPermissionRequest
+{
+  nsCOMPtr<nsIPrincipal> mPrincipal;
+  nsCOMPtr<nsPIDOMWindowInner> mWindow;
+  RefPtr<Promise> mPromise;
+  nsCOMPtr<nsIContentPermissionRequester> mRequester;
+
+public:
+  PersistentStoragePermissionRequest(nsIPrincipal* aPrincipal,
+                                     nsPIDOMWindowInner* aWindow,
+                                     Promise* aPromise)
+    : mPrincipal(aPrincipal)
+    , mWindow(aWindow)
+    , mPromise(aPromise)
+  {
+    MOZ_ASSERT(aPrincipal);
+    MOZ_ASSERT(aWindow);
+    MOZ_ASSERT(aPromise);
+
+    mRequester = new nsContentPermissionRequester(mWindow);
+  }
+
+  nsresult
+  Start();
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSICONTENTPERMISSIONREQUEST
+
+private:
+  ~PersistentStoragePermissionRequest()
+  { }
+};
+
 nsresult
 GetUsageForPrincipal(nsIPrincipal* aPrincipal,
                      nsIQuotaUsageCallback* aCallback,
@@ -119,7 +215,10 @@ GetUsageForPrincipal(nsIPrincipal* aPrincipal,
     return NS_ERROR_FAILURE;
   }
 
-  nsresult rv = qms->GetUsageForPrincipal(aPrincipal, aCallback, true, aRequest);
+  nsresult rv = qms->GetUsageForPrincipal(aPrincipal,
+                                          aCallback,
+                                          true,
+                                          aRequest);
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }
@@ -128,20 +227,228 @@ GetUsageForPrincipal(nsIPrincipal* aPrincipal,
 };
 
 nsresult
-GetStorageEstimate(nsIQuotaUsageRequest* aRequest,
-                   StorageEstimate& aStorageEstimate)
+Persisted(nsIPrincipal* aPrincipal,
+          nsIQuotaCallback* aCallback,
+          nsIQuotaRequest** aRequest)
 {
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(aCallback);
   MOZ_ASSERT(aRequest);
 
-  nsCOMPtr<nsIVariant> result;
-  nsresult rv = aRequest->GetResult(getter_AddRefs(result));
+  nsCOMPtr<nsIQuotaManagerService> qms = QuotaManagerService::GetOrCreate();
+  if (NS_WARN_IF(!qms)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIQuotaRequest> request;
+  nsresult rv = qms->Persisted(aPrincipal, getter_AddRefs(request));
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }
 
+  // All the methods in nsIQuotaManagerService shouldn't synchronously fire
+  // any callbacks when they are being executed. Even when a result is ready,
+  // a new runnable should be dispatched to current thread to fire the callback
+  // asynchronously. It's safe to set the callback after we call Persisted().
+  MOZ_ALWAYS_SUCCEEDS(request->SetCallback(aCallback));
+
+  request.forget(aRequest);
+
+  return NS_OK;
+};
+
+already_AddRefed<Promise>
+ExecuteOpOnMainOrWorkerThread(nsIGlobalObject* aGlobal,
+                              RequestResolver::Type aType,
+                              ErrorResult& aRv)
+{
+  MOZ_ASSERT(aGlobal);
+  MOZ_ASSERT_IF(aType == RequestResolver::Type::Persist,
+                NS_IsMainThread());
+
+  RefPtr<Promise> promise = Promise::Create(aGlobal, aRv);
+  if (NS_WARN_IF(!promise)) {
+    return nullptr;
+  }
+
+  if (NS_IsMainThread()) {
+    nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aGlobal);
+    if (NS_WARN_IF(!window)) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return nullptr;
+    }
+
+    nsCOMPtr<nsIDocument> doc = window->GetExtantDoc();
+    if (NS_WARN_IF(!doc)) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return nullptr;
+    }
+
+    nsCOMPtr<nsIPrincipal> principal = doc->NodePrincipal();
+    MOZ_ASSERT(principal);
+
+    switch (aType) {
+      case RequestResolver::Type::Persisted: {
+        RefPtr<RequestResolver> resolver =
+          new RequestResolver(RequestResolver::Type::Persisted, promise);
+
+        RefPtr<nsIQuotaRequest> request;
+        aRv = Persisted(principal, resolver, getter_AddRefs(request));
+
+        break;
+      }
+
+      case RequestResolver::Type::Persist: {
+        RefPtr<PersistentStoragePermissionRequest> request =
+          new PersistentStoragePermissionRequest(principal, window, promise);
+
+        aRv = request->Start();
+
+        break;
+      }
+
+      case RequestResolver::Type::Estimate: {
+        RefPtr<RequestResolver> resolver =
+          new RequestResolver(RequestResolver::Type::Estimate, promise);
+
+        RefPtr<nsIQuotaUsageRequest> request;
+        aRv = GetUsageForPrincipal(principal,
+                                   resolver,
+                                   getter_AddRefs(request));
+
+        break;
+      }
+
+      default:
+        MOZ_CRASH("Invalid aRequest type!");
+    }
+
+    if (NS_WARN_IF(aRv.Failed())) {
+      return nullptr;
+    }
+
+    return promise.forget();
+  }
+
+  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+  MOZ_ASSERT(workerPrivate);
+
+  RefPtr<PromiseWorkerProxy> promiseProxy =
+    PromiseWorkerProxy::Create(workerPrivate, promise);
+  if (NS_WARN_IF(!promiseProxy)) {
+    return nullptr;
+  }
+
+  switch (aType) {
+    case RequestResolver::Type::Estimate: {
+      RefPtr<EstimateWorkerMainThreadRunnable> runnnable =
+        new EstimateWorkerMainThreadRunnable(promiseProxy->GetWorkerPrivate(),
+                                             promiseProxy);
+      runnnable->Dispatch(Terminating, aRv);
+
+      break;
+    }
+
+    case RequestResolver::Type::Persisted: {
+      RefPtr<PersistedWorkerMainThreadRunnable> runnnable =
+        new PersistedWorkerMainThreadRunnable(promiseProxy->GetWorkerPrivate(),
+                                              promiseProxy);
+      runnnable->Dispatch(Terminating, aRv);
+
+      break;
+    }
+
+    default:
+      MOZ_CRASH("Invalid aRequest type");
+  }
+
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  return promise.forget();
+};
+
+} // namespace
+
+/*******************************************************************************
+ * Local class implementations
+ ******************************************************************************/
+
+void
+RequestResolver::ResolveOrReject()
+{
+  class MOZ_STACK_CLASS AutoCleanup final
+  {
+    RefPtr<PromiseWorkerProxy> mProxy;
+
+  public:
+    explicit AutoCleanup(PromiseWorkerProxy* aProxy)
+      : mProxy(aProxy)
+    {
+      MOZ_ASSERT(aProxy);
+    }
+
+    ~AutoCleanup()
+    {
+      MOZ_ASSERT(mProxy);
+
+      mProxy->CleanUp();
+    }
+  };
+
+  RefPtr<Promise> promise;
+  Maybe<AutoCleanup> autoCleanup;
+
+  if (mPromise) {
+    promise = mPromise;
+  } else {
+    MOZ_ASSERT(mProxy);
+
+    promise = mProxy->WorkerPromise();
+
+    // Only clean up for worker case.
+    autoCleanup.emplace(mProxy);
+  }
+
+  MOZ_ASSERT(promise);
+
+  if (mType == Type::Estimate) {
+    if (NS_SUCCEEDED(mResultCode)) {
+      promise->MaybeResolve(mStorageEstimate);
+    } else {
+      promise->MaybeReject(NS_ERROR_DOM_TYPE_ERR);
+    }
+
+    return;
+  }
+
+  MOZ_ASSERT(mType == Type::Persist || mType == Type::Persisted);
+
+  if (NS_SUCCEEDED(mResultCode)) {
+    promise->MaybeResolve(mPersisted);
+  } else {
+    promise->MaybeResolve(false);
+  }
+}
+
+NS_IMPL_ISUPPORTS(RequestResolver, nsIQuotaUsageCallback, nsIQuotaCallback)
+
+nsresult
+RequestResolver::GetStorageEstimate(nsIVariant* aResult)
+{
+  MOZ_ASSERT(aResult);
+  MOZ_ASSERT(mType == Type::Estimate);
+
+#ifdef DEBUG
+  uint16_t dataType;
+  MOZ_ALWAYS_SUCCEEDS(aResult->GetDataType(&dataType));
+  MOZ_ASSERT(dataType == nsIDataType::VTYPE_INTERFACE_IS);
+#endif
+
   nsID* iid;
   nsCOMPtr<nsISupports> supports;
-  rv = result->GetAsInterface(&iid, getter_AddRefs(supports));
+  nsresult rv = aResult->GetAsInterface(&iid, getter_AddRefs(supports));
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }
@@ -153,89 +460,151 @@ GetStorageEstimate(nsIQuotaUsageRequest* aRequest,
   MOZ_ASSERT(originUsageResult);
 
   MOZ_ALWAYS_SUCCEEDS(
-    originUsageResult->GetUsage(&aStorageEstimate.mUsage.Construct()));
+    originUsageResult->GetUsage(&mStorageEstimate.mUsage.Construct()));
 
   MOZ_ALWAYS_SUCCEEDS(
-    originUsageResult->GetLimit(&aStorageEstimate.mQuota.Construct()));
+    originUsageResult->GetLimit(&mStorageEstimate.mQuota.Construct()));
 
   return NS_OK;
 }
 
-} // namespace
-
-/*******************************************************************************
- * Local class implementations
- ******************************************************************************/
-
-void
-EstimateResolver::ResolveOrReject(Promise* aPromise)
+nsresult
+RequestResolver::GetPersisted(nsIVariant* aResult)
 {
-  MOZ_ASSERT(aPromise);
+  MOZ_ASSERT(aResult);
+  MOZ_ASSERT(mType == Type::Persist || mType == Type::Persisted);
 
-  if (NS_SUCCEEDED(mResultCode)) {
-    aPromise->MaybeResolve(mStorageEstimate);
-  } else {
-    aPromise->MaybeReject(mResultCode);
+#ifdef DEBUG
+  uint16_t dataType;
+  MOZ_ALWAYS_SUCCEEDS(aResult->GetDataType(&dataType));
+#endif
+
+  if (mType == Type::Persist) {
+    MOZ_ASSERT(dataType == nsIDataType::VTYPE_VOID);
+
+    mPersisted = true;
+    return NS_OK;
   }
+
+  MOZ_ASSERT(dataType == nsIDataType::VTYPE_BOOL);
+
+  bool persisted;
+  nsresult rv = aResult->GetAsBool(&persisted);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  mPersisted = persisted;
+  return NS_OK;
 }
 
-NS_IMPL_ISUPPORTS(EstimateResolver, nsIQuotaUsageCallback)
-
-NS_IMETHODIMP
-EstimateResolver::OnUsageResult(nsIQuotaUsageRequest *aRequest)
+template <typename T>
+nsresult
+RequestResolver::OnCompleteOrUsageResult(T* aRequest)
 {
   MOZ_ASSERT(NS_IsMainThread());
   MOZ_ASSERT(aRequest);
 
-  nsresult rv = aRequest->GetResultCode(&mResultCode);
+  nsresult resultCode;
+  nsresult rv = aRequest->GetResultCode(&resultCode);
   if (NS_WARN_IF(NS_FAILED(rv))) {
-    mResultCode = rv;
-  } else if (NS_SUCCEEDED(mResultCode)) {
-    rv = GetStorageEstimate(aRequest, mStorageEstimate);
-    if (NS_WARN_IF(NS_FAILED(rv))) {
-      mResultCode = rv;
-    }
+    return rv;
   }
 
+  if (NS_FAILED(resultCode)) {
+    return resultCode;
+  }
+
+  nsCOMPtr<nsIVariant> result;
+  rv = aRequest->GetResult(getter_AddRefs(result));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (mType == Type::Estimate) {
+    rv = GetStorageEstimate(result);
+  } else {
+    MOZ_ASSERT(mType == Type::Persist || mType == Type::Persisted);
+
+    rv = GetPersisted(result);
+  }
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+nsresult
+RequestResolver::Finish()
+{
   // In a main thread request.
   if (!mProxy) {
     MOZ_ASSERT(mPromise);
 
-    ResolveOrReject(mPromise);
+    ResolveOrReject();
     return NS_OK;
   }
 
-  // In a worker thread request.
-  MutexAutoLock lock(mProxy->Lock());
+  {
+    // In a worker thread request.
+    MutexAutoLock lock(mProxy->Lock());
 
-  if (NS_WARN_IF(mProxy->CleanedUp())) {
-    return NS_ERROR_FAILURE;
+    if (NS_WARN_IF(mProxy->CleanedUp())) {
+      return NS_ERROR_FAILURE;
+    }
+
+    RefPtr<FinishWorkerRunnable> runnable = new FinishWorkerRunnable(this);
+    if (NS_WARN_IF(!runnable->Dispatch())) {
+      return NS_ERROR_FAILURE;
+    }
   }
 
-  RefPtr<FinishWorkerRunnable> runnable = new FinishWorkerRunnable(this);
-  if (NS_WARN_IF(!runnable->Dispatch())) {
-    return NS_ERROR_FAILURE;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+RequestResolver::OnComplete(nsIQuotaRequest *aRequest)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aRequest);
+
+  mResultCode = OnCompleteOrUsageResult(aRequest);
+
+  nsresult rv = Finish();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+RequestResolver::OnUsageResult(nsIQuotaUsageRequest *aRequest)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aRequest);
+
+  mResultCode = OnCompleteOrUsageResult(aRequest);
+
+  nsresult rv = Finish();
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
   }
 
   return NS_OK;
 }
 
 bool
-EstimateResolver::
+RequestResolver::
 FinishWorkerRunnable::WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate)
 {
+  MOZ_ASSERT(aCx);
   MOZ_ASSERT(aWorkerPrivate);
   aWorkerPrivate->AssertIsOnWorkerThread();
 
-  RefPtr<PromiseWorkerProxy> proxy = mResolver->mProxy;
-  MOZ_ASSERT(proxy);
-
-  RefPtr<Promise> promise = proxy->WorkerPromise();
-  MOZ_ASSERT(promise);
-
-  mResolver->ResolveOrReject(promise);
-
-  proxy->CleanUp();
+  MOZ_ASSERT(mResolver);
+  mResolver->ResolveOrReject();
 
   return true;
 }
@@ -257,7 +626,8 @@ EstimateWorkerMainThreadRunnable::MainThreadRun()
 
   MOZ_ASSERT(principal);
 
-  RefPtr<EstimateResolver> resolver = new EstimateResolver(mProxy);
+  RefPtr<RequestResolver> resolver =
+    new RequestResolver(RequestResolver::Type::Estimate, mProxy);
 
   RefPtr<nsIQuotaUsageRequest> request;
   nsresult rv =
@@ -269,6 +639,156 @@ EstimateWorkerMainThreadRunnable::MainThreadRun()
   return true;
 }
 
+bool
+PersistedWorkerMainThreadRunnable::MainThreadRun()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  nsCOMPtr<nsIPrincipal> principal;
+
+  {
+    MutexAutoLock lock(mProxy->Lock());
+    if (mProxy->CleanedUp()) {
+      return true;
+    }
+    principal = mProxy->GetWorkerPrivate()->GetPrincipal();
+  }
+
+  MOZ_ASSERT(principal);
+
+  RefPtr<RequestResolver> resolver =
+    new RequestResolver(RequestResolver::Type::Persisted, mProxy);
+
+  RefPtr<nsIQuotaRequest> request;
+  nsresult rv = Persisted(principal, resolver, getter_AddRefs(request));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  return true;
+}
+
+nsresult
+PersistentStoragePermissionRequest::Start()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // Grant permission if pref'ed on.
+  if (Preferences::GetBool("dom.storageManager.prompt.testing", false)) {
+    if (Preferences::GetBool("dom.storageManager.prompt.testing.allow",
+                             false)) {
+      return Allow(JS::UndefinedHandleValue);
+    }
+
+    return Cancel();
+  }
+
+  return nsContentPermissionUtils::AskPermission(this, mWindow);
+}
+
+NS_IMPL_ISUPPORTS(PersistentStoragePermissionRequest,
+                  nsIContentPermissionRequest)
+
+NS_IMETHODIMP
+PersistentStoragePermissionRequest::GetPrincipal(nsIPrincipal** aPrincipal)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aPrincipal);
+  MOZ_ASSERT(mPrincipal);
+
+  NS_ADDREF(*aPrincipal = mPrincipal);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+PersistentStoragePermissionRequest::GetWindow(mozIDOMWindow** aRequestingWindow)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aRequestingWindow);
+  MOZ_ASSERT(mWindow);
+
+  NS_ADDREF(*aRequestingWindow = mWindow);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+PersistentStoragePermissionRequest::GetElement(nsIDOMElement** aElement)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aElement);
+
+  *aElement = nullptr;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+PersistentStoragePermissionRequest::Cancel()
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mPromise);
+
+  RefPtr<RequestResolver> resolver =
+    new RequestResolver(RequestResolver::Type::Persisted, mPromise);
+
+  RefPtr<nsIQuotaRequest> request;
+
+  return Persisted(mPrincipal, resolver, getter_AddRefs(request));
+}
+
+NS_IMETHODIMP
+PersistentStoragePermissionRequest::Allow(JS::HandleValue aChoices)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+
+  RefPtr<RequestResolver> resolver =
+    new RequestResolver(RequestResolver::Type::Persist, mPromise);
+
+  nsCOMPtr<nsIQuotaManagerService> qms = QuotaManagerService::GetOrCreate();
+  if (NS_WARN_IF(!qms)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  RefPtr<nsIQuotaRequest> request;
+
+  nsresult rv = qms->Persist(mPrincipal, getter_AddRefs(request));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  MOZ_ALWAYS_SUCCEEDS(request->SetCallback(resolver));
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+PersistentStoragePermissionRequest::GetRequester(
+                                     nsIContentPermissionRequester** aRequester)
+{
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aRequester);
+
+  nsCOMPtr<nsIContentPermissionRequester> requester = mRequester;
+  requester.forget(aRequester);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+PersistentStoragePermissionRequest::GetTypes(nsIArray** aTypes)
+{
+  MOZ_ASSERT(aTypes);
+
+  nsTArray<nsString> emptyOptions;
+
+  return nsContentPermissionUtils::CreatePermissionArray(
+                                       NS_LITERAL_CSTRING("persistent-storage"),
+                                       NS_LITERAL_CSTRING("unused"),
+                                       emptyOptions,
+                                       aTypes);
+}
+
 /*******************************************************************************
  * StorageManager
  ******************************************************************************/
@@ -283,64 +803,34 @@ StorageManager::~StorageManager()
 {
 }
 
+already_AddRefed<Promise>
+StorageManager::Persisted(ErrorResult& aRv)
+{
+  MOZ_ASSERT(mOwner);
+
+  return ExecuteOpOnMainOrWorkerThread(mOwner,
+                                       RequestResolver::Type::Persisted,
+                                       aRv);
+}
+
+already_AddRefed<Promise>
+StorageManager::Persist(ErrorResult& aRv)
+{
+  MOZ_ASSERT(mOwner);
+
+  return ExecuteOpOnMainOrWorkerThread(mOwner,
+                                       RequestResolver::Type::Persist,
+                                       aRv);
+}
+
 already_AddRefed<Promise>
 StorageManager::Estimate(ErrorResult& aRv)
 {
   MOZ_ASSERT(mOwner);
 
-  RefPtr<Promise> promise = Promise::Create(mOwner, aRv);
-  if (NS_WARN_IF(!promise)) {
-    return nullptr;
-  }
-
-  if (NS_IsMainThread()) {
-    nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(mOwner);
-    if (NS_WARN_IF(!window)) {
-      aRv.Throw(NS_ERROR_FAILURE);
-      return nullptr;
-    }
-
-    nsCOMPtr<nsIDocument> doc = window->GetExtantDoc();
-    if (NS_WARN_IF(!doc)) {
-      aRv.Throw(NS_ERROR_FAILURE);
-      return nullptr;
-    }
-
-    nsCOMPtr<nsIPrincipal> principal = doc->NodePrincipal();
-    MOZ_ASSERT(principal);
-
-    RefPtr<EstimateResolver> resolver = new EstimateResolver(promise);
-
-    RefPtr<nsIQuotaUsageRequest> request;
-    nsresult rv =
-      GetUsageForPrincipal(principal, resolver, getter_AddRefs(request));
-    if (NS_WARN_IF(NS_FAILED(rv))) {
-      aRv.Throw(rv);
-      return nullptr;
-    }
-
-    return promise.forget();
-  }
-
-  WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
-  MOZ_ASSERT(workerPrivate);
-
-  RefPtr<PromiseWorkerProxy> promiseProxy =
-    PromiseWorkerProxy::Create(workerPrivate, promise);
-  if (NS_WARN_IF(!promiseProxy)) {
-    return nullptr;
-  }
-
-  RefPtr<EstimateWorkerMainThreadRunnable> runnnable =
-    new EstimateWorkerMainThreadRunnable(promiseProxy->GetWorkerPrivate(),
-                                         promiseProxy);
-
-  runnnable->Dispatch(Terminating, aRv);
-  if (NS_WARN_IF(aRv.Failed())) {
-    return nullptr;
-  }
-
-  return promise.forget();
+  return ExecuteOpOnMainOrWorkerThread(mOwner,
+                                       RequestResolver::Type::Estimate,
+                                       aRv);
 }
 
 // static
diff --git a/dom/quota/StorageManager.h b/dom/quota/StorageManager.h
index 162390f48861..781daad3b3e5 100644
--- a/dom/quota/StorageManager.h
+++ b/dom/quota/StorageManager.h
@@ -39,6 +39,12 @@ public:
   }
 
   // WebIDL
+  already_AddRefed<Promise>
+  Persisted(ErrorResult& aRv);
+
+  already_AddRefed<Promise>
+  Persist(ErrorResult& aRv);
+
   already_AddRefed<Promise>
   Estimate(ErrorResult& aRv);
 
diff --git a/dom/webidl/StorageManager.webidl b/dom/webidl/StorageManager.webidl
index 5649f307a34e..8078ce96a40e 100644
--- a/dom/webidl/StorageManager.webidl
+++ b/dom/webidl/StorageManager.webidl
@@ -12,10 +12,12 @@
  Exposed=(Window,Worker),
  Func="mozilla::dom::StorageManager::PrefEnabled"]
 interface StorageManager {
-  // [Throws]
-  // Promise<boolean> persisted();
-  // [Throws]
-  // [Exposed=Window] Promise<boolean> persist();
+  [Throws]
+  Promise<boolean> persisted();
+
+  [Exposed=Window, Throws]
+  Promise<boolean> persist();
+
   [Throws]
   Promise<StorageEstimate> estimate();
 };