Check if the URL has been accessed before and signaling to the user. With this script you will be able to know if you have already accessed the specific page of some image/video/tag before. If you have never accessed a URL, it will persist it in IndexedDB, if you have already accessed it, a warning message will be added to your screen.
这些是此脚本变更过代码的版本。 显示所有版本。
