Backlog Notification Extension is a web extension for Chrome that allows users to receive and check Backlog notifications directly from the menu bar. This unofficial extension utilizes the Backlog API to provide users with the ability to view the number of notifications and a list of them. Users can open each task from the list and mark them as read.

To use the extension, users need to save their space domain and API key in the extension settings. By clicking on the extension icon, users can view the list of notifications. Clicking on a notification will open the corresponding link. Additionally, holding down the meta key (Ctrl on Windows, Command on Mac) while clicking on a notification will mark the task as read. Holding down the Shift key while clicking on a notification allows users to copy the task key and title.

The extension also provides the option to mark all notifications as read and access recently viewed projects and tasks.