Star-rules is a free Chrome extension developed by Chaitanya Pramod. It falls under the category of Browsers and is specifically categorized as an Add-ons & Tools program. With Star-rules, users can easily apply CSS rules to all elements on a webpage.

The main feature of Star-rules is the ability to apply CSS transitions to all elements on the current page. This means that all transitions, such as color changes or animations, will smoothly animate between values. To try out this functionality, simply open a webpage in the Chrome browser and click on the star icon in the toolbar. When hovering over the links in the article, you will notice that their background smoothly changes.