When you click on a tab using the middle mouse button or mouse wheel, it will close that tab. (Konqueror needs to be restarted for changes to take effect.)
As jo op in ljepper klikke mei de middelste mûsknop of mûstsjil, dan sil de ljepper slute. (It is nedich om Konqueror op 'e nij te starten om de wiziging brûke te kinnen.)