Visual notifications is a free Chrome extension developed by Lukasz Gruszka. It falls under the category of Browsers and is a subcategory of Add-ons & Tools. This extension aims to provide visual notifications when an inactive tab starts playing sound.

The main purpose of Visual notifications is to enhance the user's browsing experience by drawing attention to tabs that are playing sound. When a tab becomes audible, the extension notifies the tab's window by setting the "drawAttention" attribute to true. This action prompts the operating system to mark the window state as URGENT, causing the taskbar button to start blinking.

This extension is particularly useful in scenarios where a user wants to have visual notifications along with the sound notifications, such as when using a web chat client like WhatsApp. It also helps users quickly locate tabs that are playing sound.

It is important to note that Visual notifications is only compatible with the Linux operating system.