show you an indicator icon when you visit some webpage if the links on that page are in your black list
This extension is for security purposes.
When you visit a webpage, there may be some annoying advertising links. You may not understand them and click on them, but they are not the content you want. As punishment, you add these domains to your badsite domain list. In this way, when you visit certain web pages next time, you can intuitively see that these annoying links have been set to gray with deletion effect text, and there is a red warning icon behind them.