Smart Tabs helps you manage your tabs by keeping track of the ones that are active and inactive. It works as follows: every time you open a new tab on your browser, Smart Tabs will keep track of it. As soon as you click on the close button on a tab, it will be closed and removed from your current view. 

If, after the desired period of time, the last tab of the browser is terminated, the Smart Tabs extension will terminate its functions. However, if you find yourself with a problem that prevents you from clicking the close button on a tab or the tab's name to switch to the next one, you can use the Smart Tabs icon on your browser's toolbar to switch the view.