Worked on the uBlockOrigin/uAssets repository to enhance ad-blocking performance and page stability for Chess.com. Developed a DOM-presence guard using JavaScript to ensure the sidebar ad was only targeted when present, reducing unnecessary processing and improving rendering efficiency. Later addressed a layout shift issue by applying CSS to introduce a zero-width placeholder when ads were absent, preventing content reflow and eliminating cumulative layout shift spikes. Focused on maintainable, scoped changes with clear commit traceability, leveraging front end development skills and attention to code hygiene. The work contributed to a smoother user experience and more efficient ad-blocking logic within the project.