Jedynki z librusem is a Chrome extension developed by Eitho. It falls under the category of Browsers and is a subcategory of Add-ons & Tools. The extension is available for free and is exclusively designed to work with the Librus diary.

The main purpose of Jedynki z librusem is to help students keep track of the number of negative grades they can still receive without affecting their overall average. By inputting the desired average, the extension calculates how many ones with a specific weight you can still afford. This functionality allows students to strategically manage their grades, especially towards the end of the semester or school year.

Additionally, Jedynki z librusem prevents automatic logout from Librus after the session expires, ensuring uninterrupted usage. The extension provides a user-friendly interface with color-coded boxes that indicate the current "ones situation" based on your desired average. It also offers an anonymization feature, replacing your name and class with "Anonimowy Uczeń" and "4 TI" respectively, which can be useful for sharing screenshots without revealing personal information.

Overall, Jedynki z librusem is a helpful Chrome extension for students using Librus, offering grade management and session continuity features.