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

Apple Has Far-Reaching Plans To Block Hundreds Of Programmatic Data Companies From iOS

Apple’s WebKit crackdown appears to extend well beyond The Trade Desk, putting hundreds of ad tech, data and identity vendors on a mysterious, dynamically updated block list.

Josh Reed, Zoom's VP of brand and content, speaking at AdExchanger's Programmatic IO event in New York City (September 28, 2006)

Zoom’s Marketing Challenge Is That It’s Too Well Known For Its Own Good

Zoom has 99% unaided brand awareness, which sounds great on paper. But there’s a catch: Most people still think it’s just a video-call app.

Why Agencies Think They Shouldn’t Own Agentic AI Tools Or The Data Used To Build Them

Agencies are differentiating their tech stacks by building custom agentic AI tools for their clients. And they’re rethinking owning those AI tools – particularly since licensing them creates new revenue streams.

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

Programmatic IO: Insurers Are Building Ad Tech’s AI Accountability Layer

Agencies and marketers discussed the future of AI governance at AdExchanger’s Programmatic IO NYC this week. The main takeaway? Expect insurers to play an increasingly important role in managing AI compliance.

Apple’s Latest Operating System Blocks The Trade Desk From Serving Ads On Safari

The Trade Desk is unable to serve ads to the Safari browser for Apple device owners that have downloaded iOS 27. Apple has been investigating the issue since last week.

Who Will Stand Up For The Open Web?

The open web is done, stick a fork in it. Banner blindness is near universal, search traffic has run dry and publishers are struggling for oxygen. But what if that’s … not true?