すべて既読ボタン for Garoon is a free Chrome add-on developed by an unnamed developer. It falls under the category of Browsers and is classified as an Add-ons & Tools subcategory. This add-on aims to enhance the functionality of the Garoon platform by adding a button to the top menu bar that allows users to mark all notifications as read.

With すべて既読ボタン for Garoon, users can conveniently manage their notifications on the Garoon platform. By clicking the added button, all unread notifications will be marked as read, saving users time and effort in individually marking each notification. It is important to note that this extension is unofficial and not developed by Cybozu Inc., the company behind Garoon.

Overall, すべて既読ボタン for Garoon is a useful Chrome add-on for Garoon users who want to streamline their notification management. Its simple and straightforward functionality makes it a handy tool for those who frequently use the Garoon platform.