diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 0587eb8927..dd1fe45862 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -14456,6 +14456,20 @@ nsGlobalChromeWindow::TakeOpenerForInitialContentBrowser(mozIDOMWindowProxy** aO
   return NS_OK;
 }
 
+/* static */ already_AddRefed<nsGlobalWindow>
+nsGlobalWindow::Create(nsGlobalWindow *aOuterWindow)
+{
+  RefPtr<nsGlobalWindow> window = new nsGlobalWindow(aOuterWindow);
+  window->InitWasOffline();
+  return window.forget();
+}
+
+void
+nsGlobalWindow::InitWasOffline()
+{
+  mWasOffline = NS_IsOffline();
+}
+
 #if defined(MOZ_WIDGET_ANDROID)
 int16_t
 nsGlobalWindow::Orientation(CallerType aCallerType) const