時計 is a free Chrome add-on developed by みやけむし. This program provides users with a convenient way to keep track of time while using their browser. In addition to a toolbar clock, the add-on also displays the current time on the webpage being viewed for a few seconds.

With 時計, users can easily stay aware of the time without needing to switch to a separate clock application or check their device's system clock. The toolbar clock is always visible, allowing for quick glances at the time while browsing. Moreover, the on-page time display adds an extra layer of convenience, ensuring that users are always aware of the current time, even when their attention is focused on a specific webpage.

Overall, 時計 is a useful add-on for Chrome users who want a simple and accessible timekeeping tool. Its unobtrusive design and seamless integration make it a valuable addition to any browsing experience.