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Private mode window as a window is buggy in most recent version.
The private mode window in the most recent version seem to be having some new bug introduced. When a private mode window is in windowed mode it looks like this for some reason: http://i.imgur.com/AAaFyNL.png with that odd white bar on the top, with the offset darker area. Controls under the darker area also do not work properly (such as the new tab and close tab buttons) and don't react to you clicking on them.