During June 2025, Ben Thrall focused on enhancing the reliability of JIT compilation in the mozilla/gecko-dev repository by addressing a nuanced issue in frame handling. He fixed the REALM_INDEPENDENT flag management for OSR’d frames when the self_hosted_cache feature is enabled, reducing potential realm-independence problems and improving the robustness of the JIT compiler’s execution path. This work required deep debugging and a strong understanding of compiler optimization, leveraging C++ to implement the solution. Although the period involved a single targeted bug fix rather than new features, the change demonstrated careful attention to detail and a solid grasp of complex runtime behavior.