diff --git a/dom/indexedDB/ActorsParent.cpp b/dom/indexedDB/ActorsParent.cpp
index 9feac6178..3d688ec9a 100644
--- a/dom/indexedDB/ActorsParent.cpp
+++ b/dom/indexedDB/ActorsParent.cpp
@@ -19407,20 +19407,32 @@ FactoryOp::CheckPermission(ContentParent* aContentParent,
   MOZ_ASSERT(NS_IsMainThread());
   MOZ_ASSERT(mState == State::Initial || mState == State::PermissionRetry);
 
+  // TenFourFox issue 451 for Mozilla bug 1410106
   const PrincipalInfo& principalInfo = mCommonParams.principalInfo();
-  if (principalInfo.type() != PrincipalInfo::TSystemPrincipalInfo &&
-      NS_WARN_IF(!Preferences::GetBool(kPrefIndexedDBEnabled, false))) {
-    if (aContentParent) {
-      // The DOM in the other process should have kept us from receiving any
-      // indexedDB messages so assume that the child is misbehaving.
-      aContentParent->KillHard("IndexedDB CheckPermission 1");
-    }
-    return NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR;
-  }
+  if (principalInfo.type() != PrincipalInfo::TSystemPrincipalInfo) {
+    if (principalInfo.type() != PrincipalInfo::TContentPrincipalInfo) {
+      if (aContentParent) {
+        // We just want ContentPrincipalInfo or SystemPrincipalInfo.
+        aContentParent->KillHard("IndexedDB CheckPermission 0");
+      }
 
-  if (NS_WARN_IF(mCommonParams.privateBrowsingMode())) {
-    // XXX This is only temporary.
-    return NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR;
+      return NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR;
+    }
+
+    if (NS_WARN_IF(!Preferences::GetBool(kPrefIndexedDBEnabled, false))) {
+      if (aContentParent) {
+        // The DOM in the other process should have kept us from receiving any
+        // indexedDB messages so assume that the child is misbehaving.
+        aContentParent->KillHard("IndexedDB CheckPermission 1");
+      }
+
+      return NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR;
+    }
+
+    if (NS_WARN_IF(mCommonParams.privateBrowsingMode())) {
+      // IndexedDB is currently disabled in privateBrowsing.
+      return NS_ERROR_DOM_INDEXEDDB_NOT_ALLOWED_ERR;
+    }
   }
 
   mFileHandleDisabled = !Preferences::GetBool(kPrefFileHandleEnabled);
diff --git a/dom/indexedDB/IDBFactory.cpp b/dom/indexedDB/IDBFactory.cpp
index 80e30b6ad..58a6a52d8 100644
--- a/dom/indexedDB/IDBFactory.cpp
+++ b/dom/indexedDB/IDBFactory.cpp
@@ -199,7 +199,10 @@ IDBFactory::CreateForMainThreadJS(JSContext* aCx,
     return rv;
   }
 
-  rv = CreateForMainThreadJSInternal(aCx, aOwningObject, principalInfo, aFactory);
+  rv = CreateForMainThreadJSInternal(aCx, aOwningObject, principalInfo, aFactory,
+                                     /* Only IndexedDatabaseManager::DefineIndexedDB
+                                        can call this, which is always chrome, thus ... */
+                                     /* aIsPrivateBrowsing */ false);
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }
@@ -224,7 +227,9 @@ IDBFactory::CreateForDatastore(JSContext* aCx,
     new PrincipalInfo(SystemPrincipalInfo()));
 
   nsresult rv =
-    CreateForMainThreadJSInternal(aCx, aOwningObject, principalInfo, aFactory);
+    CreateForMainThreadJSInternal(aCx, aOwningObject, principalInfo, aFactory, 
+                                  /* Only chrome can get here, therefore ... */
+                                  /* aIsPrivateBrowsing */ false);
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }
@@ -240,7 +245,8 @@ IDBFactory::CreateForWorker(JSContext* aCx,
                             JS::Handle<JSObject*> aOwningObject,
                             const PrincipalInfo& aPrincipalInfo,
                             uint64_t aInnerWindowID,
-                            IDBFactory** aFactory)
+                            IDBFactory** aFactory,
+                            bool aIsPrivateBrowsing)
 {
   MOZ_ASSERT(!NS_IsMainThread());
   MOZ_ASSERT(aPrincipalInfo.type() != PrincipalInfo::T__None);
@@ -252,7 +258,8 @@ IDBFactory::CreateForWorker(JSContext* aCx,
                         aOwningObject,
                         principalInfo,
                         aInnerWindowID,
-                        aFactory);
+                        aFactory,
+                        aIsPrivateBrowsing);
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }
@@ -268,7 +275,8 @@ IDBFactory::CreateForMainThreadJSInternal(
                                        JSContext* aCx,
                                        JS::Handle<JSObject*> aOwningObject,
                                        nsAutoPtr<PrincipalInfo>& aPrincipalInfo,
-                                       IDBFactory** aFactory)
+                                       IDBFactory** aFactory,
+                                       bool aIsPrivateBrowsing)
 {
   MOZ_ASSERT(NS_IsMainThread());
   MOZ_ASSERT(aPrincipalInfo);
@@ -290,7 +298,8 @@ IDBFactory::CreateForMainThreadJSInternal(
                         aOwningObject,
                         aPrincipalInfo,
                         /* aInnerWindowID */ 0,
-                        aFactory);
+                        aFactory,
+                        aIsPrivateBrowsing);
   if (NS_WARN_IF(NS_FAILED(rv))) {
     return rv;
   }
@@ -304,7 +313,8 @@ IDBFactory::CreateForJSInternal(JSContext* aCx,
                                 JS::Handle<JSObject*> aOwningObject,
                                 nsAutoPtr<PrincipalInfo>& aPrincipalInfo,
                                 uint64_t aInnerWindowID,
-                                IDBFactory** aFactory)
+                                IDBFactory** aFactory,
+                                bool aIsPrivateBrowsing)
 {
   MOZ_ASSERT(aCx);
   MOZ_ASSERT(aOwningObject);
@@ -327,6 +337,7 @@ IDBFactory::CreateForJSInternal(JSContext* aCx,
   factory->mOwningObject = aOwningObject;
   mozilla::HoldJSObjects(factory.get());
   factory->mInnerWindowID = aInnerWindowID;
+  factory->mPrivateBrowsingMode = aIsPrivateBrowsing;
 
   factory.forget(aFactory);
   return NS_OK;
diff --git a/dom/indexedDB/IDBFactory.h b/dom/indexedDB/IDBFactory.h
index f7614de43..98c806f79 100644
--- a/dom/indexedDB/IDBFactory.h
+++ b/dom/indexedDB/IDBFactory.h
@@ -70,7 +70,7 @@ class IDBFactory final
   nsTArray<nsAutoPtr<PendingRequestInfo>> mPendingRequests;
 
   BackgroundFactoryChild* mBackgroundActor;
-
+  
 #ifdef DEBUG
   PRThread* mOwningThread;
 #endif
@@ -100,7 +100,8 @@ public:
                   JS::Handle<JSObject*> aOwningObject,
                   const PrincipalInfo& aPrincipalInfo,
                   uint64_t aInnerWindowID,
-                  IDBFactory** aFactory);
+                  IDBFactory** aFactory,
+                  bool aIsPrivateBrowsing);
 
   static bool
   AllowedForWindow(nsPIDOMWindow* aWindow);
@@ -217,14 +218,16 @@ private:
   CreateForMainThreadJSInternal(JSContext* aCx,
                                 JS::Handle<JSObject*> aOwningObject,
                                 nsAutoPtr<PrincipalInfo>& aPrincipalInfo,
-                                IDBFactory** aFactory);
+                                IDBFactory** aFactory,
+                                bool aIsPrivateBrowsing);
 
   static nsresult
   CreateForJSInternal(JSContext* aCx,
                       JS::Handle<JSObject*> aOwningObject,
                       nsAutoPtr<PrincipalInfo>& aPrincipalInfo,
                       uint64_t aInnerWindowID,
-                      IDBFactory** aFactory);
+                      IDBFactory** aFactory,
+                      bool aIsPrivateBrowsing);
 
   static nsresult
   AllowedForWindowInternal(nsPIDOMWindow* aWindow,
diff --git a/dom/workers/WorkerScope.cpp b/dom/workers/WorkerScope.cpp
index cc6c7fe70..cf58fcc82 100644
--- a/dom/workers/WorkerScope.cpp
+++ b/dom/workers/WorkerScope.cpp
@@ -379,7 +379,8 @@ WorkerGlobalScope::GetIndexedDB(ErrorResult& aErrorResult)
                                   owningObject,
                                   principalInfo,
                                   mWorkerPrivate->WindowID(),
-                                  getter_AddRefs(indexedDB));
+                                  getter_AddRefs(indexedDB),
+                                  mWorkerPrivate->IsInPrivateBrowsing());
     if (NS_WARN_IF(NS_FAILED(rv))) {
       aErrorResult = rv;
       return nullptr;