A Google Chrome extension developer designs, creates, and modifies web browser extensions specifically for the Google Chrome browser. They use programming languages such as JavaScript, HTML, and CSS. Their tasks include identifying user requirements, writing code, debugging, and performing updates to improve functionality. They also ensure extensions are user-friendly, secure, and efficient. Additionally, they oversee the entire extension lifecycle, from concept and design to testing and deployment. They may also provide technical support to users, troubleshoot issues, and regularly update the extension to maintain compatibility with the latest Chrome updates and standards.