Home Online Advertising Firefox to Block Third-Party Cookies in Privacy Update

Firefox to Block Third-Party Cookies in Privacy Update

SHARE:

FirefoxMozilla’s Firefox browser will have a new cookie policy when its release 22 comes out later this year. The new patch, developed by privacy advocate Jonathan Mayer, will allow first-party cookies, but block third-party cookies.

“The new cookie policy is intended to better conform to user privacy expectations and preferences,” Mayer said in an email with AdExchanger. “For my part, I share Mozilla’s enthusiasm for making Do Not Track a reality. It would provide consumer choice over third-party web tracking that is comprehensive, persistent, and polite (i.e. without technical intervention).”

The policy will be similar to that of Safari, which allows cookie permissions for first-party content and for third-party content only if it already has one cookie set, Mayer explained in a blog post about the policy.

Alex Fowler, global privacy and public policy lead for Mozilla, wrote a post on the Mozilla Privacy Blog about the update: “Many years of observing Safari’s approach to third party cookies, a rapidly expanding number of third party companies using cookies to track users, and strong user support for more control is driving our decision to move forward with this patch.”

A couple tweets from advertisers have been circulating in the media coverage of this new policy, but Mayer said he and Mozilla are open to dialogue and feedback from users and the industry.

“In my conversations with Mozillans, their thinking was guided exclusively by two touchstones,” Mayer told AdEchanger. “Does this make Firefox a better product for its users? And does this advance the web ecosystem?”

Must Read

TV Media Buyers Want Outcomes – So Nielsen Is Introducing More Advanced Audiences

On Wednesday, and in time for the upfronts, Nielsen added more than 200 advanced audience segments in Nielsen ONE, its cross-platform analytics dashboard.

Comic: Shopper Marketing Data

Infillion Strikes Again, This Time Buying The Retail Purchase Data Company Catalina

Infillion, an ad tech business built on M&A, is back with another acquisition. This time it’s Catalina, a century-old market research and shopper marketing company with roots in physical cash register machines.

This Election Season, Buyers Can Curate Deals Based On Voter Values

OpenX and Givsly’s new curation solution lets political campaigns reach voters based on data sourced from nonprofits, rather than traditional party affiliation.

Privacy! Commerce! Connected TV! Read all about it. Subscribe to AdExchanger Newsletters

Walmart’s Ad Revenue Totaled $6.4 Billion In 2025 As The Ecommerce Flywheel Started To Spin

“Fully a third of our profit in the most recent quarter was related to advertising and membership income,” Walmart CFO John David Rainey told investors on Thursday.

Comic: AI-TA?

Q4: Omnicom’s IPG Merger Is An AI Test Case

Omnicom just reported its first earnings since closing the IPG deal and, shocker, it’s saying AI is main growth driver for combined holdco.

Digital-native brands need to figure out how to win in retail shelves. They're finding it difficult, to say the least.

Big CPG Brands Are Quick To Cut Ad Spend Amid A Tough US Market

Companies like P&G, PepsiCo and Colgate-Palmolive are cutting marketing spend as the easiest and quickest way to protect profitability.