Worked on the facebook/lexical repository to address a cross-browser user experience issue affecting keyboard navigation in collapsible nodes, specifically targeting inconsistencies in Firefox. Applied expertise in JavaScript, front end development, and testing to deliver a focused bug fix that improved accessibility and ensured consistent arrow-key navigation across major browsers. The solution was implemented as a single, well-documented commit, maintaining high standards of code quality and traceability. By resolving this browser-specific friction, the work enhanced keyboard navigation reliability for Lexical users and contributed to a more accessible and uniform user experience without introducing new features during the development period.