During June 2025, Christophe Denizet upgraded the PDF.js library in the mozilla/gecko-dev repository, focusing on reliability and maintainability. He integrated fixes for Bug 1971992 and related issues, while enhancing the annotation editor with improved edit mode handling and refined selection logic. His work included internal component refactoring and systematic updates to build and version metadata, which improved traceability and streamlined future releases. Using JavaScript and leveraging his expertise in library updates and bug fixing, Christophe’s contributions reduced user friction in document annotation workflows and strengthened release hygiene, reflecting a thoughtful approach to both code quality and cross-team collaboration.