捨て星ツール - Suteboshi Extension is a Chrome extension designed to make it easier to use the SHOWROOM website. This extension allows users to open a specified URL at a specified time, making it useful not only for SHOWROOM but also for other web pages. The main feature of the extension is the ability to set a date and time in a small window and open the specified URL at that time. Users can also manage multiple URLs by inputting them on separate lines or by dragging and dropping links from the browser. The extension also includes a backward button that allows users to open multiple tabs without closing the small window.

Overall, 捨て星ツール - Suteboshi Extension is a simple and convenient tool for managing and opening URLs at specified times. It provides users with the flexibility to schedule and automate their browsing experience.