Matt Mirus focused on stability and correctness improvements for the ghostty-org/ghostty repository during December 2024. He addressed two core bugs using Zig, configuration management, and documentation skills. First, he corrected the gtk-single-instance default to desktop, ensuring application launches aligned with both expected behavior and documentation. Second, he stabilized window focus by reverting an unintended change, preventing unfocused windows from coming to the front when hovered over split panes. These targeted fixes improved launch reliability and window behavior predictability. While no new features were introduced, Matt’s work demonstrated careful attention to user experience and codebase consistency within a short timeframe.