• Google is rolling out "Enhanced Ad Privacy" to Chrome.
• The feature allows websites to target ads based on the user's browsing history.
• The feature notification pop-up is available for some Chrome users.
• Google plans to opt out of third-party cookies for targeted advertising.
• Themes are determined based on the user's browser history via the Chrome Themes API.
• Some users complain and ask to disable the feature.
• The pop-up window is regionally-variable and offers the option to turn off theme API support.
• Apple and Mozilla will not use themes for privacy reasons.