--- a/widget/windows/nsWindow.cpp
+++ b/widget/windows/nsWindow.cpp
@@ -7164,17 +7164,17 @@ nsWindow::IsPopup()
 }
 
 bool
 nsWindow::ShouldUseOffMainThreadCompositing()
 {
   // We don't currently support using an accelerated layer manager with
   // transparent windows so don't even try. I'm also not sure if we even
   // want to support this case. See bug 593471
-  if (mTransparencyMode == eTransparencyTransparent) {
+  if (!HasRemoteContent() && mTransparencyMode == eTransparencyTransparent) {
     return false;
   }
 
   return nsBaseWidget::ShouldUseOffMainThreadCompositing();
 }
 
 void
 nsWindow::WindowUsesOMTC()