GBbgBGM is a Chrome add-on developed by fuuminmoomin. It is a free program categorized under Browsers and falls into the subcategory of Add-ons & Tools.

The main purpose of GBbgBGM is to prevent the sound from being muted when the browser or tab displaying the web application (Granblue Fantasy) loses focus. This add-on allows users to continue their work in the background without worrying about the sound being muted.

Please note that the developer has mentioned that the official app now has the same feature, rendering this extension unnecessary.

Disclaimer: The developer does not take any responsibility for any damages caused by using this extension. Users are advised to use it at their own risk.