LONDON — Google says it’s delaying plans to phase out Chrome web browser technology that tracks users for ad purposes because it needs more time to develop a replacement system.

The tech giant said Thursday that its deadline to remove so-called third-party cookies will be pushed back to late 2023, nearly two years later than the initial timing of January 2022.

“We need to move at a responsible pace, allowing sufficient time for public discussion on the right solutions and for publishers and the advertising industry to migrate their services,” Vinay Goel, the director of privacy engineering for Chrome, said in a blog post.

Third-party cookies are snippets of code that log user information and are used by advertisers to more effectively target their campaigns, thereby helping fund free online content such as newspapers and blogs. However, they’ve also been a longstanding source of privacy concerns because they can be employed to track users across the Internet.

Cookies were written into early browsers to cut down on some of the inconveniences of surfing the web. They allowed passwords to autofill, or websites to remember payment information so users didn’t have to type theirs in every time they came back. They also created a trail of bread crumbs that the burgeoning online ad industry eagerly ate up, helping free websites make money.

Privacy advocates have always criticized the model, and more and more regular users have become aware of the issue, some expressing their displeasure by downloading ad blockers.

Google is retiring thirdparty cookies as it overhauls Chrome to tighten privacy, but the proposals have shaken up the online advertising industry, raising fears that replacement technology will leave even less room for online ad rivals. European Union and British regulators have been investigating Google’s plans, known as Privacy Sandbox.

To resolve the U.K. investigation, the company has offered the country’s competition watchdog a role overseeing the cookie phaseout. It has also promised not to discriminate against rival digital advertising companies when designing the new technology and pledged to give the U.K. competition watchdog 60 days’ notice before removing third-party cookies.

Goel said Google aims to have the new technology available by the end of 2022 for developers to start adopting, which would allow thirdparty cookies to be phased out of Chrome over three months “ending in late 2023.” That timeline is in line with the commitments Google has made to the U.K. competition watchdog, Goel said.

One of the leading ideas to replace third-party cookies is a technique that hides users in large online groups based on their interests while keeping web browsing histories on devices to maintain privacy.