Librus Average is a free Chrome extension developed by Krzysztof Zdulski. It falls under the category of Browsers and is a subcategory of Add-ons & Tools. This extension is designed to help users view grade averages that are hidden by Librus Synergia.

Please note that Librus Average uses Google Analytics to log simple events such as preference changes and extension loads. However, it does not log or use any of your personal data, including grades or averages, in any other way than displaying them.

Overall, Librus Average is a useful extension for students who want to view hidden grade averages on Librus Synergia's website. Its customization options and availability on multiple browsers make it a convenient tool for users.