Safari has an extension called Exposer which allows users to preview the all the open tabs in the browser. This is a useful extension that helps the users to quickly locate and navigate to the tab multiple tabs are opened.
Safari users can install the Exposer from the extension gallery. After installation a icon will appear in the menu bar as shown below. Clicking the icon would show the preview of all the open tabs.
The default keyboard shortcut of this extension is Options + T. Users can change the keyboard shortcut using the settings provided as part of Safari extensions.