tabs-top is a free Chrome extension developed by Anton Fisher. It falls under the category of Browsers and specifically, the subcategory of Add-ons & Tools. This extension is designed to show the CPU usage in a tab's favicon.

One of the key features of tabs-top is the addition of a small bar to the left side of a tab's favicon. This bar serves as an indicator of the CPU usage by the tab. With this visual cue, users can easily identify which tabs are consuming a significant amount of CPU resources.

It is important to note that tabs-top only works with the Chrome Dev version. Therefore, users must have the appropriate version of Chrome installed in order to utilize this extension effectively.

Overall, tabs-top is a useful Chrome extension for those who want to monitor and manage CPU usage in their browser tabs. With its simple yet effective visual representation, users can easily identify and optimize tab performance.