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Incognito mode is a window-level mode - all pages viewed within this window are not persisted to the user's history, and incognito pages use a temporary cookie store that is blank at the start of the incognito session. Chromium's backend could be made capable of running incognito on a per-tab basis, but we keep the mode at the window level to avoid the confusion of having a tabstrip of mixed-mode tabs. To avoid having to back-delete a page's history, we do not allow dragging between incognito and regular-mode windows.