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If you only have one tab open, Window>Close Tab closes the main window. IMO, this is incorrect behavior. The command to close the Window in other apps is usually named "Close Window".

I noticed this since I created a Cocoa Gesture to close a tab, like I have in Safari. I do this so that I can quickly close a tab without mistakenly closing the window. In OW, however, there is no way to differentiate between a tab and the main window.