During July 2025, contributed to the mozilla/gecko-dev repository by delivering a targeted configuration cleanup and bug fix focused on improving build and test maintainability. The work involved removing obsolete references to security.sandbox.content.headless and eliminating a redundant webgl.out-of-process test configuration, directly addressing Bug 1974363. Using skills in build system configuration, code refactoring, and testing, the changes reduced the risk of misconfiguration and streamlined ongoing maintenance. Proficiency in C++, JavaScript, and Python was demonstrated through careful cross-repository impact assessment and clear commit documentation, resulting in a more stable and maintainable codebase for both current and future development efforts.