Cerebellum is a lightweight browser agent that achieves user-defined goals on web pages through keyboard and mouse actions. It simplifies web browsing into a navigable directed graph, using large language models (LLMs) to analyze page content and interactive elements, thus determining the next actions. With its innovative AI-driven automation technology, Cerebellum improves the efficiency and accuracy of web automation tasks. Currently, it is compatible with any Selenium-supported browser and can populate forms using user-provided JSON data. The product is in its Beta stage and is available for free to developers and researchers.