Sutare_Extension is a free add-on for the Chrome browser that displays a warning when accessing old web pages. Developed by Toshiyuki Masui, this add-on aims to alert users when they visit outdated websites.

The main feature of Sutare_Extension is its ability to detect old web pages and display a warning message. This can be helpful in preventing users from accessing outdated or potentially unsafe content. The warning message is automatically removed after a certain period of time, allowing users to continue browsing without interruptions.

Overall, Sutare_Extension is a useful tool for Chrome users who want to stay informed about the age of the web pages they visit. It provides a simple and straightforward way to identify outdated content and make informed decisions while browsing.