esa-costume is a Chrome add-on developed by yamat47 that allows users to customize the appearance of esa.io pages. With this add-on, users can make the H2 and H3 headings in Markdown more prominent, as esa.io primarily uses page titles and makes H1 headings less useful. By making H2 and H3 headings stand out, users can navigate and read content more easily. Additionally, this add-on enhances the visual hierarchy of the page by adding folder icons, making the page's structure more intuitive and understandable.

Overall, esa-costume is a free Chrome add-on that enhances the visual experience of esa.io, making it easier for users to navigate and read content on the platform.