Google seems to be testing a tool to make incognito browsing even more private in Chrome for iOS.
The beta version of the iOS app for Chrome introduced a feature to require Touch ID or Face ID to unlock incognito tabs that you might not want others to access. If the feature is turned on, going back to Chrome after a closed session will show a blurry incognito tab, and verification will be required, based on the release notes captured by 9to5Google. Google said in the notes that the feature is intended to “add more security to incognito tabs.”
To enable the feature, go to Configuration, go to Privacyand select Locks incognito tabs when you close Chrome. According to 9to5Google, the feature is not available for everyone running the beta version of the Chrome app on iOS. Google did not immediately return any requests for feedback on the feature and its wider release.
As 9to5Google pointed out, a version of this privacy setting is now available in the main Google search appliance, although this privacy setting is activated after you sign out for 15 minutes. To activate it, open the main Google application, go to Configuration, select Privacy and securityand enable the a option Enable Face ID for incognito mode.