Green Scroll Bar - Pure CSS3 is a simple Chrome add-on developed by zzllrr. This add-on allows users to customize the appearance of the scrollbar in their web browser using pure CSS3, without the need for any JavaScript.

The scroll bar is green and has a cute design that adds a touch of personality to web pages, iframes, and text areas. It is easy to install and works well on various web elements.

If users are looking for other scrollbar styles, the add-on also provides CSS Hack/MOD/DIY tips for customization. Users can modify the original CSS of the scrollbar or disable and enable the extension to make changes take effect.

Overall, Green Scroll Bar - Pure CSS3 is a handy add-on for those who want to add some visual flair to their browsing experience without the need for JavaScript.