In the dynamic landscape of web development, prioritizing user privacy is paramount. In this 20-minute conference talk, we delve into the world of "Privacy-First Frontend Monitoring." We will explore strategies and technologies that empower developers to scrutinize and optimize web frontend error and performance without compromising user confidentiality. Discover how implementing privacy-centric approaches not only enhances the reliability and efficiency of web applications but also fosters user trust in an era where data protection is of utmost concern. Join me as we navigate the complexities of frontend monitoring, ensuring a seamless user experience while safeguarding the privacy of those who engage with our digital creations.