Active Site Blocker is a free Chrome add-on developed by Tsuyoshi Yonemoto. It falls under the category of Browsers and specifically belongs to the Add-ons & Tools subcategory. This handy tool allows users to restrict access to specific websites, helping to enhance concentration and productivity.

With Active Site Blocker, you have the ability to block access to specific sites that may be distracting or time-consuming. By simply entering the URL of the website you want to block, you can prevent yourself from accessing it. The add-on also offers wildcard support, allowing you to block entire domains or specific pages using asterisks.

Whether you need to focus on work, studies, or any other task that requires concentration, Active Site Blocker can be a valuable tool. Its simplicity and effectiveness make it a great choice for anyone looking to minimize distractions and maximize productivity while using the Chrome browser.