During June 2025, work centered on maintaining and improving the rendering pipeline in the mozilla/gecko-dev repository, with a focus on browser development and layout engine correctness. The primary contribution addressed a bug in coordinate conversion within ViewportUtils, specifically refining how CSS transforms and nested content are handled. Using C++ and deep knowledge of layout engine internals, the fix simplified traversal logic to the root prescontext frame, ensuring accurate screen-relative visual calculations in complex scenarios. This update enhanced the robustness of coordinate space conversions, and included thorough documentation to support future maintenance and traceability within the codebase. No new features were released.