Firefox 70 introduces a host of new features and updates aimed at enhancing user privacy, security, and web development tools. The update includes "Social Tracking Protection," which blocks cross-site tracking cookies to safeguard digital privacy, and new security features like integrated breach alerts and complex password generation with Firefox Lockwise. Performance improvements are marked by a faster JavaScript Baseline Interpreter and reduced resource usage for video processing. Web developers benefit from enhanced tools such as an inactive CSS rules indicator, color contrast information, and keyboard accessibility checks, alongside new CSS properties for improved styling. JavaScript sees updates with number separators for better readability and support for BigInt values in Intl methods. Overall, Firefox 70 delivers substantial improvements across privacy, security, performance, and developer tools, encouraging users to update and experience these enhancements firsthand.