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* Most windows apps use crtl-w as a close command, including IE6, making this unintuitive behavior.
** OS X apps as well
* A popup window is not generally recognized as a window (no menu bar, tab bar, bookmark section...) but becomes one when closing the tab by ctrl-w by showing a tab bar. A popup should be closable by ctrl-w - so how to tell the difference between popup and main window?
** In addition, think of mouse gestures: These become worthless if I can't close a popup with the same gesture as closing a tab.
==Should this be a preference?==