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Welcome to Android Central! If you've opened Incognito tabs in the Chrome browser, this notification will remain in the status bar to remind you to close those tabs. Otherwise, if you had been viewing something, shall we say, sensitive, and then you just tapped Home to get to the homescreen, then the next time you or someone else tapped the Chrome icon or the Recent Apps button, whatever was in that tab will show up clearly. To close the Incognito tab, you can simply swipe down the notification panel and tap that notification, which will close all currently open Incognito tabs.