The phasing out of third-party cookies -- bits of software that keep track of sites visited by users -- will be pushed back into mid-2023 instead of late 2022 for the Chrome browser, Google said in a blog post.

"We need to move at a responsible pace," said Google privacy engineering director Vinay Goel.

"This will allow sufficient time for public discussion on the right solutions, continued engagement with regulators, and for publishers and the advertising industry to migrate their services."

Google has said the elimination of cookies is in response to privacy concerns. But critics said the new system devised by the internet giant poses a different set of privacy issues and could strengthen Google's dominance of digital advertising.

Google's alternative to cookies called Federated Learning of Cohorts (FLoC) identifies groups of people with common interests without individualized tracking.

Some businesses have objected to the Google plan claiming it will force more advertisers into its "walled garden."

European publishers said the new system would create a "black box" that would keep crucial market information away from all players in the digital publishing world except for Google.

Some analysts argued that even though FLoC would not identify individual users, it would reveal enough data that could allow people to be tracked.

"We plan to continue to work with the web community to create more private approaches to key areas, including ad measurement, delivering relevant ads and content, and fraud detection," Goel said.