Close the window on the lower left tab corner
 

When having several tabs open you can close a tab by clicking the left lower corner on the miniature graphic representation in the drawer. But if there is only one singel tab open in a window this option disappears and you have to move to the ordinary close window button at the upper left of the window.

Why not leave the option of closing the tab wich now includes the entire window if there is only one tab open? It's not a big issue but hey, it's not easy to find big issues on the near perfect stuff OmniWeb has become!

If (and I hope) the mini tab graphics live through the next major iterations of OW this is not a request locked in to the current version 5 of OW.