Block F**king Sites is a free Chrome add-on developed by Cato. As the name suggests, it allows users to block websites using Chrome's declarativeNetRequest API.

With Block F**king Sites, users can easily prevent access to specific websites that they find distracting, inappropriate, or simply want to avoid. Whether it's social media platforms, online gaming sites, or any other web pages, this add-on provides a simple and effective way to keep them blocked.

By leveraging Chrome's declarativeNetRequest API, Block F**king Sites ensures that the blocked websites are completely inaccessible, giving users the peace of mind they need to focus on their work or other important tasks.

Block F**king Sites is a valuable tool for anyone looking to enhance their productivity and eliminate distractions while using the Chrome browser. It's easy to install, user-friendly, and provides a reliable solution for blocking unwanted websites.