During June 2025, Perry Wang contributed to mozilla/gecko-dev by delivering targeted improvements to scrolling behavior, focusing on both bug resolution and enhanced test coverage. He addressed a bug affecting right-to-left (RTL) layouts with height-0 elements by removing an unnecessary layout-completion condition, ensuring correct scroll behavior and adding a dedicated test for validation. Additionally, Perry expanded the overscroll-behavior test suite, verifying that the 'none' value is respected across all scrollable containers, including those with hidden and auto overflow. His work, utilizing CSS, JavaScript, and web platform testing, reduced regression risk and improved cross-browser consistency in scrolling features.