Check if the URL has been accessed before and signal it to the user. With this script you can know if a specific page has been accessed before. If you have never accessed a URL, it will persist it in IndexedDB, if you have already accessed it, when you access it again a warning message will be added to your screen. I personally use this script to check if I have already accessed a specific page of an adult image/video site, to avoid downloading them again unnecessarily. Use your creativity.
