•  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.