Tabs Counter is a Chrome extension developed by Den Kasyanov. This free tool assists users in efficiently counting the number of open tabs and windows within the Chrome browser. It provides the functionality to track tabs within the current window as well as across all open windows.

The key features of Tabs Counter include the ability to display the total count of tabs in the current window, across all open windows, and the total number of open windows. Users have the option to view this information through a convenient popup or sidebar interface. Moreover, this extension is open source, offering transparency to users.