setInterval sniffer is a helpful Chrome add-on developed by Nikita Vasilyev. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This free program allows users to keep track of all the running intervals on a webpage through Chrome DevTools.

With setInterval sniffer, users can easily monitor and manage their setTimeout's. The add-on displays all the active intervals on a page, while cleared intervals are conveniently grayed out. This feature allows developers to quickly identify and troubleshoot any issues related to intervals in their web applications.

The tool offers a simple and accessible way to analyze and debug setInterval functions, ensuring smoother performance and efficient debugging for developers working with JavaScript. Overall, setInterval sniffer is a valuable addition to Chrome DevTools for anyone working with intervals in their web development projects.