Nanobrowser is an open-source Chrome extension designed for efficient web automation using AI technology. It supports multi-agent systems, allowing users to run complex web tasks using their own LLM API keys. Similar to OpenAI Operator, but completely free and open-source, users can run tasks within their local browser, ensuring privacy and security. Nanobrowser offers flexible LLM options, allowing users to choose different models based on their needs and assign different models to different agents, balancing performance and cost. Additionally, it features task automation, an interactive sidebar, session history, and more, making it suitable for users who require efficient web operations.