This extension does in fact block websites, and the orange banner that appears on blocked websites is a nice touch. However, it is sometimes difficult and counterintuitive to black specific websites. You have to be really particular in order to get a website blocked. I have had some instances in which I was easily able to block a website. I simply typed in the URL and that was it. Other times, however, it took many attempts to get a certain website blocked with this extension, and critically, I do not know what I did when I was successful that was different from what I did when I was unsuccessful. Nevertheless, I appreciate the developer's offering of a website blocker extension.