Worked on memory management and emitter optimization in the mozilla/gecko-dev repository, focusing on transitioning control structures to stack allocation and emitters to heap allocation for improved performance and reduced memory usage. Enhanced the bytecode emitter by refining undefined and constant equality handling, using direct instructions and stricter comparisons to increase emission efficiency and correctness. Addressed a bug in SuppressedError cause handling, ensuring accurate error processing with comprehensive test coverage. In the antiwork/helper project, improved email reply reliability by centralizing and validating CC/BCC address parsing on both frontend and backend. Utilized C++, JavaScript, and TypeScript throughout these contributions.