You may see an option on your LibFetch! browser extension settings for "Automate my authentication and skip associated pop-ups".
This is a setting where you can decide if you'd like to be redirected automatically when you arrive at an e-resource that NIE Library has a subscription to.
For example, if you open up a new browser and arrive at the JSTOR website, if NIE Library has a subscription to JSTOR, you'll be automatically redirected to your library authentication page to be authenticated by the library. Once authenticated, you'll be redirected to JSTOR with a valid authentication session, without seeing the LibFetch! extentin.
This is beneficial if you'd prefer to not see the pop-up appear as often as it usually would. Having this option switched ON, you will always be redirected automatically when you are on a library resource that your library subscribed to.