Firefox includes new developer tools that represent the structure of websites in a new way and make it easier to live-edit CSS code. The first is a powerful visual layout tool unique to Firefox, Page Inspector 3D View. Nicknamed Tilt, it is a brand new WebGL-based website visualization tool that highlights the structure of a page better than a flat view, so anyone can immediately understand the relationship of the code to the page output. While developer tools like “view source” have always been useful to learn about how to develop a page, the 3D View more clearly illustrates how the parts of a website are structured. After selecting “3D” View in Page Inspector, just hover your mouse over the elements to get more information about each piece you select.