Tonton (トントン) is a free Chrome add-on developed by yasulab. It is designed to add a "knock-knock" button to Idobata, a popular online chat platform. With Tonton, users can easily send a knock-knock notification to their colleagues or friends in Idobata.

This add-on enhances the communication experience on Idobata by providing a fun and interactive way to get someone's attention. Instead of sending a regular chat message, users can simply click on the Tonton button to send a knock-knock notification. This can be particularly useful in busy chat rooms or when someone is not actively looking at their screen.

Tonton (トントン) is a simple yet effective tool for Idobata users who want to add a playful element to their communication. It is available for free on the Chrome Web Store and can be easily installed with just a few clicks.