Custom CSS is a free add-on for the Chrome browser developed by LiuW. This add-on aims to enhance the browsing experience by providing a custom CSS option. With Custom CSS, users can modify the appearance of websites by applying their own CSS styles.

One of the main features of Custom CSS is the ability to force the use of the Microsoft YaHei font, as mentioned in the description provided by the developer. This can be particularly useful for users who encounter garbled or misaligned text on websites like Taobao, Tudou, and GitHub.

It's important to note that the information about compatibility updates provided by the developer is limited. However, Custom CSS is designed to work with the Chrome browser, making it accessible to a wide range of users.

Overall, Custom CSS offers a way for users to personalize their browsing experience by applying custom CSS styles and addressing font-related issues on certain websites. This add-on provides a simple and accessible solution for users who want to enhance their Chrome browsing experience.