Blacklist is a simple extension for Google Chrome that can block websites on the Internet. 

While you can use any website as a target, you must use one that is either slow, contains ads, or has spyware or malware in the first place. You can find these sites by searching for them on Google. 

The main window of the application is a list of websites that you have blocked. You can then click on the name of the website and a second window will appear with more information about it.