Dont Close Last Tab is a Firefox add-on designed to improve tab management for users who often find themselves accidentally closing their last active tab. This personalization tool ensures that at least one normal tab remains open alongside pinned tabs, preventing the frustration of losing an important browsing session. Additionally, it offers the functionality to automatically close duplicate tabs, streamlining the user's browsing experience and reducing clutter.

The add-on also provides an optional feature to keep the last window open, preventing the browser from quitting unexpectedly. This makes it particularly useful for users who frequently juggle multiple tasks and require a seamless workflow. Overall, Dont Close Last Tab is a practical solution for enhancing productivity and maintaining an organized tab environment.