Worked on the mozilla/gecko-dev repository to optimize IPC cookie permissions deserialization by implementing on-demand, cross-thread deserialization for CookieJarSettings. This approach allowed the Deserialize function to execute on any thread and defer work until necessary, reducing main-thread workload and increasing threading flexibility. Using C++ and leveraging system programming and performance optimization skills, the changes improved browser responsiveness in cookie-related operations and set the stage for further IPC performance enhancements. The work maintained core functionality while optimizing the timing of deserialization, resulting in projected improvements to user experience through lower main-thread latency and more efficient resource utilization.