During December 2024, Gabriel Caban focused on enhancing the stability and thread-safety of the mozilla/rhino repository by addressing a deadlock issue in the ThreadSafeSlotMapContainer. He refactored core components such as AccessorSlot, IdScriptableObject, LambdaAccessorSlot, MemberBox, and Slot to improve property access and descriptor handling under concurrent conditions. Using Java and applying object-oriented programming principles, Gabriel introduced new methods to ensure correctness when comparing getter and setter slots. His work reduced the risk of hangs in multi-threaded environments, demonstrating a deep understanding of concurrency and refactoring to deliver more robust and reliable thread-safe object behavior.