Web developers face ongoing security challenges, with cross-site scripting (XSS) being a prevalent threat that can lead to data theft and session hijacking. A tutorial outlines a method to set up automatic XSS vulnerability detection using browser security testing tools and continuous integration, specifically employing CircleCI, Jest, and Puppeteer for automated testing. The tutorial provides guidance on cloning a sample application, running manual and automated tests, and implementing server-side data validation to mitigate XSS risks. By following the steps, developers can enhance their application's security posture and integrate security checks into the CI/CD pipeline, ensuring vulnerabilities are addressed before code reaches production. This proactive approach not only secures code but also promotes a security-conscious development culture.