Saverill worked on the zen-browser/theme-store repository, delivering a feature that enhanced the Personal Toolbar’s visibility and transitions when the bookmark bar is enabled. Using CSS and front end development skills, Saverill implemented logic to manage toolbar visibility, ensuring smooth animations and accurate height adjustments across different states. The technical approach focused on reducing UI flicker and addressing edge-case glitches, resulting in a more stable and consistent user experience. Although the work was limited to a single feature over one month, it demonstrated attention to detail in user interface behavior and contributed to a more polished theming workflow for the project.