mozilla/gecko-dev
Jun 2025 – Jul 2025
2 Months active
Languages Used
C++JavaScriptRustTOMLWebAssembly
Technical Skills
Compiler OptimizationGarbage CollectionJIT CompilationJavaScript EngineMemory ManagementTesting
Ben Visness
PROFILE
Ben Visness
Worked on the mozilla/gecko-dev repository to enhance WebAssembly support and runtime reliability. Over two months, delivered features such as extending the Wasm memory cap to 16 GiB on 64-bit systems and implementing a comprehensive WebAssembly Threads Proposal Test Suite. Addressed stability in null-congruence checks and improved optimization safety for Wasm garbage collection by refining MIR handling. Focused on compiler optimization, memory management, and robust testing, using C++, Rust, and WebAssembly. The work strengthened Gecko’s ability to handle large-scale and multithreaded Wasm workloads, reduced regression risk, and ensured safer, more flexible optimization paths for future development.
Overall Statistics
Feature vs Bugs
60%Features
Repository Contributions
10Total
Bugs
2
Commits
10
Features
3
Lines of code
154,451
Activity Months2
Your Network
876 peopleSame Organization
@mozilla.com376
Shared Repositories
500
Work History
July 2025
6 Commits • 1 Features
Jul 1, 2025July 2025: Delivered the WebAssembly Threads Proposal Test Suite for mozilla/gecko-dev, focusing on memory access, atomic operations, synchronization primitives, and table operations to validate multithreaded WebAssembly semantics. Implemented via six commits tied to Bug 1710645, with code reviews (r=rhunt). This work reduces regression risk, improves runtime reliability, and strengthens future WebAssembly threading support in Gecko.
6 Commits • 1 Features
Jul 1, 2025July 2025: Delivered the WebAssembly Threads Proposal Test Suite for mozilla/gecko-dev, focusing on memory access, atomic operations, synchronization primitives, and table operations to validate multithreaded WebAssembly semantics. Implemented via six commits tied to Bug 1710645, with code reviews (r=rhunt). This work reduces regression risk, improves runtime reliability, and strengthens future WebAssembly threading support in Gecko.
July 2025
June 2025
4 Commits • 2 Features
Jun 1, 2025June 2025 performance and stability improvements in Gecko: focused Wasm memory scaling, stability of null-congruence checks, and guarantees for Wasm GC optimization via MIR enhancements. Delivered stronger foundations for large wasm workloads, safer optimization paths, and expanded test coverage with minimal risk to existing behavior.
June 2025
4 Commits • 2 Features
Jun 1, 2025June 2025 performance and stability improvements in Gecko: focused Wasm memory scaling, stability of null-congruence checks, and guarantees for Wasm GC optimization via MIR enhancements. Delivered stronger foundations for large wasm workloads, safer optimization paths, and expanded test coverage with minimal risk to existing behavior.
Activity
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Quality Metrics
Correctness86.0%
Maintainability84.0%
Architecture84.0%
Performance64.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++JavaScriptRustTOMLWebAssembly
Technical Skills
Build SystemsCompiler OptimizationConfiguration ManagementGarbage CollectionJIT CompilationJavaScript EngineMemory ManagementTestingWebAssembly
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline