Filippo worked on enhancing data accuracy in the mdn/browser-compat-data repository by addressing a critical issue with Edge Legacy’s HTTP Origin header support. He analyzed discrepancies between Edge Legacy and Firefox, then updated JSON-based compatibility data to align their representations, ensuring that partial support was correctly attributed. This involved refining UI annotations for Edge version data, which improved clarity for developers relying on cross-browser compatibility information. Filippo applied his expertise in browser compatibility and data management to maintain high data quality, supporting downstream tooling and documentation. His focused contribution deepened the reliability of compatibility data for both Edge and Firefox users.