diff --git a/dom/workers/ServiceWorkerManager.cpp b/dom/workers/ServiceWorkerManager.cpp
index a2bb7bd8267..d86f01bdf6d 100644
--- a/dom/workers/ServiceWorkerManager.cpp
+++ b/dom/workers/ServiceWorkerManager.cpp
@@ -25,6 +25,7 @@
 #include "jsapi.h"
 
 #include "mozilla/BasePrincipal.h"
+#include "mozilla/ClearOnShutdown.h"
 #include "mozilla/ErrorNames.h"
 #include "mozilla/LoadContext.h"
 #include "mozilla/dom/BindingUtils.h"
@@ -84,6 +85,8 @@ static_assert(nsIHttpChannelInternal::CORS_MODE_CORS == static_cast<uint32_t>(Re
 static_assert(nsIHttpChannelInternal::CORS_MODE_CORS_WITH_FORCED_PREFLIGHT == static_cast<uint32_t>(RequestMode::Cors_with_forced_preflight),
               "RequestMode enumeration value should match Necko CORS mode value.");
 
+static StaticRefPtr<ServiceWorkerManager> gInstance;
+
 struct ServiceWorkerManager::RegistrationDataPerPrincipal
 {
   // Ordered list of scopes for glob matching.
@@ -343,9 +346,6 @@ NS_INTERFACE_MAP_BEGIN(ServiceWorkerManager)
   NS_INTERFACE_MAP_ENTRY(nsIServiceWorkerManager)
   NS_INTERFACE_MAP_ENTRY(nsIIPCBackgroundChildCreateCallback)
   NS_INTERFACE_MAP_ENTRY(nsIObserver)
-  if (aIID.Equals(NS_GET_IID(ServiceWorkerManager)))
-    foundInterface = static_cast<nsIServiceWorkerManager*>(this);
-  else
   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIServiceWorkerManager)
 NS_INTERFACE_MAP_END
 
@@ -354,7 +354,17 @@ ServiceWorkerManager::ServiceWorkerManager()
 {
   // Register this component to PBackground.
   MOZ_ALWAYS_TRUE(BackgroundChild::GetOrCreateForCurrentThread(this));
+}
 
+ServiceWorkerManager::~ServiceWorkerManager()
+{
+  // The map will assert if it is not empty when destroyed.
+  mRegistrationInfos.Clear();
+}
+
+void
+ServiceWorkerManager::Init()
+{
   if (XRE_GetProcessType() == GeckoProcessType_Default) {
     nsRefPtr<ServiceWorkerRegistrar> swr = ServiceWorkerRegistrar::Get();
     MOZ_ASSERT(swr);
@@ -376,12 +386,6 @@ ServiceWorkerManager::ServiceWorkerManager()
   }
 }
 
-ServiceWorkerManager::~ServiceWorkerManager()
-{
-  // The map will assert if it is not empty when destroyed.
-  mRegistrationInfos.Clear();
-}
-
 class ContinueLifecycleTask : public nsISupports
 {
   NS_DECL_ISUPPORTS
@@ -2287,9 +2291,19 @@ ServiceWorkerManager::GetOrCreateJobQueue(const nsACString& aKey,
 already_AddRefed<ServiceWorkerManager>
 ServiceWorkerManager::GetInstance()
 {
-  nsCOMPtr<nsIServiceWorkerManager> swm = mozilla::services::GetServiceWorkerManager();
-  nsRefPtr<ServiceWorkerManager> concrete = do_QueryObject(swm);
-  return concrete.forget();
+  // Note: We don't simply check gInstance for null-ness here, since otherwise
+  // this can resurrect the ServiceWorkerManager pretty late during shutdown.
+  static bool firstTime = true;
+  if (firstTime) {
+    AssertIsOnMainThread();
+
+    gInstance = new ServiceWorkerManager();
+    gInstance->Init();
+    ClearOnShutdown(&gInstance);
+    firstTime = false;
+  }
+  nsRefPtr<ServiceWorkerManager> copy = gInstance.get();
+  return copy.forget();
 }
 
 void
diff --git a/dom/workers/ServiceWorkerManager.h b/dom/workers/ServiceWorkerManager.h
index cff2beaf089..aa354f2e245 100644
--- a/dom/workers/ServiceWorkerManager.h
+++ b/dom/workers/ServiceWorkerManager.h
@@ -277,16 +277,6 @@ public:
   NS_DECL_NSISERVICEWORKERMANAGER
   NS_DECL_NSIIPCBACKGROUNDCHILDCREATECALLBACK
   NS_DECL_NSIOBSERVER
-  NS_DECLARE_STATIC_IID_ACCESSOR(NS_SERVICEWORKERMANAGER_IMPL_IID)
-
-  static ServiceWorkerManager* FactoryCreate()
-  {
-    AssertIsOnMainThread();
-
-    ServiceWorkerManager* res = new ServiceWorkerManager;
-    NS_ADDREF(res);
-    return res;
-  }
 
   struct RegistrationDataPerPrincipal;
   nsClassHashtable<nsCStringHashKey, RegistrationDataPerPrincipal> mRegistrationInfos;
@@ -382,6 +372,9 @@ private:
   ServiceWorkerManager();
   ~ServiceWorkerManager();
 
+  void
+  Init();
+
   ServiceWorkerJobQueue*
   GetOrCreateJobQueue(const nsACString& aOriginSuffix,
                       const nsACString& aScope);
@@ -538,9 +531,6 @@ private:
   nsTArray<PendingOperation> mPendingOperations;
 };
 
-NS_DEFINE_STATIC_IID_ACCESSOR(ServiceWorkerManager,
-                              NS_SERVICEWORKERMANAGER_IMPL_IID);
-
 } // namespace workers
 } // namespace dom
 } // namespace mozilla
diff --git a/layout/build/nsLayoutModule.cpp b/layout/build/nsLayoutModule.cpp
index 6d81b4d9ef2..c2f1216acbe 100644
--- a/layout/build/nsLayoutModule.cpp
+++ b/layout/build/nsLayoutModule.cpp
@@ -312,7 +312,7 @@ NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(DOMRequestService,
 NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(QuotaManager,
                                          QuotaManager::FactoryCreate)
 NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(ServiceWorkerManager,
-                                         ServiceWorkerManager::FactoryCreate)
+                                         ServiceWorkerManager::GetInstance)
 NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(ServiceWorkerPeriodicUpdater,
                                          ServiceWorkerPeriodicUpdater::GetSingleton)
 NS_GENERIC_FACTORY_CONSTRUCTOR(WorkerDebuggerManager)