"However, the Safari browser contained functionality that then enabled other Google advertising cookies to be set on the browser," Whetstone added. "We didn't anticipate that this would happen, and we have now started removing these advertising cookies from Safari browsers."
The news comes at a sensitive time for Google. Last year, the company reached a legal settlement with the U.S. Federal Trade Commission about its privacy practices, and agreed not to misrepresent its privacy practices. Last month, Google consolidated its polices for all its sites into one privacy setting.
In a blog item posted Friday, Microsoft criticized Google for purposefully evading the Safari privacy settings, and offered its own browser as an alternative.