diff --git a/dom/devicestorage/DeviceStorageRequestChild.cpp b/dom/devicestorage/DeviceStorageRequestChild.cpp
index f796721e4a0c..5075f4ae8f7c 100644
--- a/dom/devicestorage/DeviceStorageRequestChild.cpp
+++ b/dom/devicestorage/DeviceStorageRequestChild.cpp
@@ -58,6 +58,11 @@ DeviceStorageRequestChild::
     mCallback = nullptr;
   }
 
+  nsCOMPtr<nsPIDOMWindow> window = mRequest->GetOwner();
+  if (!window) {
+    return true;
+  }
+
   switch (aValue.type()) {
 
     case DeviceStorageResponseValue::TErrorResponse:
@@ -73,7 +78,7 @@ DeviceStorageRequestChild::
       mDSFile->GetFullPath(fullPath);
       AutoJSContext cx;
       JS::Rooted<JS::Value> result(cx);
-      StringToJsval(mRequest->GetOwner(), fullPath, &result);
+      StringToJsval(window, fullPath, &result);
       mRequest->FireSuccess(result);
       break;
     }
@@ -86,7 +91,7 @@ DeviceStorageRequestChild::
       mDSFile->GetFullPath(fullPath);
       AutoJSContext cx;
       JS::Rooted<JS::Value> result(cx);
-      StringToJsval(mRequest->GetOwner(), fullPath, &result);
+      StringToJsval(window, fullPath, &result);
 
       mDSFileDescriptor->mDSFile = mDSFile;
       mDSFileDescriptor->mFileDescriptor = r.fileDescriptor();
@@ -103,7 +108,7 @@ DeviceStorageRequestChild::
       nsCOMPtr<nsIDOMFile> file = do_QueryInterface(blob);
       AutoJSContext cx;
       JS::Rooted<JS::Value> result(cx,
-        InterfaceToJsval(mRequest->GetOwner(), file, &NS_GET_IID(nsIDOMFile)));
+        InterfaceToJsval(window, file, &NS_GET_IID(nsIDOMFile)));
       mRequest->FireSuccess(result);
       break;
     }
@@ -131,7 +136,7 @@ DeviceStorageRequestChild::
       AvailableStorageResponse r = aValue;
       AutoJSContext cx;
       JS::Rooted<JS::Value> result(cx);
-      StringToJsval(mRequest->GetOwner(), r.mountState(), &result);
+      StringToJsval(window, r.mountState(), &result);
       mRequest->FireSuccess(result);
       break;
     }
@@ -141,7 +146,7 @@ DeviceStorageRequestChild::
       StorageStatusResponse r = aValue;
       AutoJSContext cx;
       JS::Rooted<JS::Value> result(cx);
-      StringToJsval(mRequest->GetOwner(), r.storageStatus(), &result);
+      StringToJsval(window, r.storageStatus(), &result);
       mRequest->FireSuccess(result);
       break;
     }
@@ -151,7 +156,7 @@ DeviceStorageRequestChild::
       FormatStorageResponse r = aValue;
       AutoJSContext cx;
       JS::Rooted<JS::Value> result(cx);
-      StringToJsval(mRequest->GetOwner(), r.mountState(), &result);
+      StringToJsval(window, r.mountState(), &result);
       mRequest->FireSuccess(result);
       break;
     }
@@ -161,7 +166,7 @@ DeviceStorageRequestChild::
       MountStorageResponse r = aValue;
       AutoJSContext cx;
       JS::Rooted<JS::Value> result(cx);
-      StringToJsval(mRequest->GetOwner(), r.storageStatus(), &result);
+      StringToJsval(window, r.storageStatus(), &result);
       mRequest->FireSuccess(result);
       break;
     }
@@ -171,7 +176,7 @@ DeviceStorageRequestChild::
       UnmountStorageResponse r = aValue;
       AutoJSContext cx;
       JS::Rooted<JS::Value> result(cx);
-      StringToJsval(mRequest->GetOwner(), r.storageStatus(), &result);
+      StringToJsval(window, r.storageStatus(), &result);
       mRequest->FireSuccess(result);
       break;
     }
diff --git a/dom/devicestorage/nsDeviceStorage.cpp b/dom/devicestorage/nsDeviceStorage.cpp
index 70cfb547c2ff..710e6f67e7cb 100644
--- a/dom/devicestorage/nsDeviceStorage.cpp
+++ b/dom/devicestorage/nsDeviceStorage.cpp
@@ -1816,6 +1816,9 @@ public:
   NS_IMETHOD Run()
   {
     MOZ_ASSERT(NS_IsMainThread());
+    if (!mRequest->GetOwner()) {
+      return NS_OK;
+    }
     mRequest->FireError(mError);
     mRequest = nullptr;
     return NS_OK;
@@ -1906,13 +1909,18 @@ ContinueCursorEvent::Continue()
 NS_IMETHODIMP
 ContinueCursorEvent::Run()
 {
+  nsCOMPtr<nsPIDOMWindow> window = mRequest->GetOwner();
+  if (!window) {
+    return NS_OK;
+  }
+
   nsRefPtr<DeviceStorageFile> file = GetNextFile();
 
   nsDOMDeviceStorageCursor* cursor
     = static_cast<nsDOMDeviceStorageCursor*>(mRequest.get());
 
   AutoJSContext cx;
-  JS::Rooted<JS::Value> val(cx, nsIFileToJsval(cursor->GetOwner(), file));
+  JS::Rooted<JS::Value> val(cx, nsIFileToJsval(window, file));
 
   if (file) {
     cursor->mOkToCallContinue = true;
@@ -2135,6 +2143,10 @@ public:
   NS_IMETHOD Run()
   {
     MOZ_ASSERT(NS_IsMainThread());
+    nsCOMPtr<nsPIDOMWindow> window = mRequest->GetOwner();
+    if (!window) {
+      return NS_OK;
+    }
 
     nsString state = NS_LITERAL_STRING("unavailable");
     if (mFile) {
@@ -2143,7 +2155,7 @@ public:
 
     AutoJSContext cx;
     JS::Rooted<JS::Value> result(cx);
-    StringToJsval(mRequest->GetOwner(), state, &result);
+    StringToJsval(window, state, &result);
     mRequest->FireSuccess(result);
     mRequest = nullptr;
     return NS_OK;
@@ -2169,6 +2181,10 @@ public:
   NS_IMETHOD Run()
   {
     MOZ_ASSERT(NS_IsMainThread());
+    nsCOMPtr<nsPIDOMWindow> window = mRequest->GetOwner();
+    if (!window) {
+      return NS_OK;
+    }
 
     nsString state = NS_LITERAL_STRING("undefined");
     if (mFile) {
@@ -2177,7 +2193,7 @@ public:
 
     AutoJSContext cx;
     JS::Rooted<JS::Value> result(cx);
-    StringToJsval(mRequest->GetOwner(), state, &result);
+    StringToJsval(window, state, &result);
     mRequest->FireSuccess(result);
     mRequest = nullptr;
     return NS_OK;
@@ -2203,6 +2219,10 @@ public:
   NS_IMETHOD Run()
   {
     MOZ_ASSERT(NS_IsMainThread());
+    nsCOMPtr<nsPIDOMWindow> window = mRequest->GetOwner();
+    if (!window) {
+      return NS_OK;
+    }
 
     nsString state = NS_LITERAL_STRING("unavailable");
     if (mFile) {
@@ -2211,7 +2231,7 @@ public:
 
     AutoJSContext cx;
     JS::Rooted<JS::Value> result(cx);
-    StringToJsval(mRequest->GetOwner(), state, &result);
+    StringToJsval(window, state, &result);
     mRequest->FireSuccess(result);
     mRequest = nullptr;
     return NS_OK;
@@ -2237,6 +2257,10 @@ public:
   NS_IMETHOD Run()
   {
     MOZ_ASSERT(NS_IsMainThread());
+    nsCOMPtr<nsPIDOMWindow> window = mRequest->GetOwner();
+    if (!window) {
+      return NS_OK;
+    }
 
     nsString state = NS_LITERAL_STRING("unavailable");
     if (mFile) {
@@ -2245,7 +2269,7 @@ public:
 
     AutoJSContext cx;
     JS::Rooted<JS::Value> result(cx);
-    StringToJsval(mRequest->GetOwner(), state, &result);
+    StringToJsval(window, state, &result);
     mRequest->FireSuccess(result);
     mRequest = nullptr;
     return NS_OK;
@@ -2271,6 +2295,10 @@ public:
   NS_IMETHOD Run()
   {
     MOZ_ASSERT(NS_IsMainThread());
+    nsCOMPtr<nsPIDOMWindow> window = mRequest->GetOwner();
+    if (!window) {
+      return NS_OK;
+    }
 
     nsString state = NS_LITERAL_STRING("unavailable");
     if (mFile) {
@@ -2279,7 +2307,7 @@ public:
 
     AutoJSContext cx;
     JS::Rooted<JS::Value> result(cx);
-    StringToJsval(mRequest->GetOwner(), state, &result);
+    StringToJsval(window, state, &result);
     mRequest->FireSuccess(result);
     mRequest = nullptr;
     return NS_OK;
@@ -2322,10 +2350,13 @@ public:
   NS_IMETHOD Run()
   {
     MOZ_ASSERT(NS_IsMainThread());
+    nsCOMPtr<nsPIDOMWindow> window = mRequest->GetOwner();
+    if (!window) {
+      return NS_OK;
+    }
 
     AutoJSContext cx;
     JS::Rooted<JS::Value> result(cx, JSVAL_NULL);
-    nsPIDOMWindow* window = mRequest->GetOwner();
 
     if (mFile) {
       result = nsIFileToJsval(window, mFile);