Worked on stabilizing local test discovery for Firefox UI functional tests in the mozilla/gecko-dev repository by transitioning the test manifest format from .ini to .toml. This update improved the reliability of local Mach test execution, allowing the test runner to correctly identify and load UI test suites. The work involved resolving a bug that previously prevented proper test discovery, thereby reducing setup time and debugging effort for developers. Demonstrated skills in Python, automation, and testing, with a focus on aligning test infrastructure with developer workflows. The solution streamlined local development cycles and enhanced the maintainability of the test suite configuration.