Improve 209 is a Chrome extension developed by logonoff, aimed at enhancing the user experience of the CSC209 Winter 2023 website. This free tool implements quality of life changes, including a dark mode feature that adapts to the system color scheme and C syntax highlighting powered by highlight.js. Additionally, users can now access lecture slides quickly through a convenient popup.

The extension also improves website navigation by bolding the current link in the navbar, opening external links in new tabs with a clear indicator, and enhancing the main navigation for better usability. Furthermore, it fixes a broken Piazza link and adds a direct link to submit labs and other materials in the main navigation menu.