UniqueTabs is a free Chrome add-on developed by agostonbarna that aims to prevent and close duplicate tabs. With this handy tool, users can avoid the frustration of accidentally opening multiple instances of the same webpage.

The main feature of UniqueTabs is its ability to prevent duplicate tabs from opening. By simply right-clicking on a link and selecting "UniqueTabs," users can choose to open the link in a new tab and switch to it, or open it in a new background tab if the tab already exists. This feature helps to keep browsing organized and clutter-free.

In addition to preventing duplicate tabs, UniqueTabs also offers the option to close duplicate tabs. Users can do this by clicking on the UniqueTabs menu icon, which provides a quick and convenient way to clean up any duplicate tabs that may have been unintentionally opened.

Overall, UniqueTabs is a useful Chrome add-on for those who frequently find themselves with multiple instances of the same webpage open. With its ability to prevent and close duplicate tabs, it helps to streamline the browsing experience and keep things organized.