https://www.bleepingcomputer.com/news/google/chrome-for-ios-will-let-you-lock-incognito-mode-with-face-id/ > Google Chrome for iOS is getting a new privacy feature that lets you lock your opened Incognito tabs behind your iPhone's Face ID or Touch ID biometric authentication features. > Users commonly browse in Incognito mode when visiting sensitive sites that they do not wish to appear in their browser history. However, if a user leaves their phone unlocked, someone can launch Chrome and view the currently open Incognito mode tabs.