System CPU Usage is a free Chrome extension developed by loora. It falls under the category of Browsers and is classified as an Add-ons & Tools subcategory. This extension allows users to easily monitor the CPU usage of their system through the browser toolbar.

By opening the toolbar popup UI, users can view the current CPU usage in percentage. Additionally, a color bar is displayed, which represents the active CPU usage and updates every second. The toolbar icon also changes dynamically based on the current CPU usage. It is worth noting that the color bars are random blue colors, both in the toolbar popup UI and the toolbar button's icon.