In June 2025, R. Concepcion refactored the Perftest YAML configuration within the mozilla/gecko-dev repository, focusing on improving the maintainability and reliability of the test infrastructure. By removing redundant operating system prefixes and leveraging existing platform and worker-type definitions, R. Concepcion streamlined test job definitions and reduced configuration inconsistencies. This targeted cleanup, implemented using YAML and grounded in CI/CD and configuration management practices, addressed the needs outlined in Bug 1965489. The work resulted in a more concise and manageable configuration, lowering maintenance overhead and supporting more robust continuous integration workflows for the project’s ongoing development and testing processes.