Block Sites is a free Chrome extension developed by Pat Lillis. This browser add-on falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. As the name suggests, Block Sites allows users to block websites based on a list of domains.

With Block Sites, users can easily prevent access to specific websites by adding them to the block list. The extension currently only blocks sites on the "reddit.com" domain, providing users with a way to limit their time spent on this popular social media platform.

Block Sites is a straightforward and easy-to-use tool for those who want to control their browsing habits and increase productivity. While the extension's functionality is currently limited to blocking sites on the "reddit.com" domain, it offers a simple solution for individuals looking to reduce distractions and stay focused while using Chrome.