Mozilla is rolling out a new defense against advanced tracking tactics in Firefox 79; users should get it during the next few weeks. Credit: HAKINMHAN / Getty Images Mozilla today announced a new defense against advanced tracking tactics that it will be switching on in Firefox 79 starting immediately and pushing out to the remaining user base during the next few weeks. Calling the improved technologies and techniques Enhanced Tracking Protection 2.0 – Mozilla said that ETP 2.0’s primary job is to block redirect tracking, also known as bounce tracking. Trackers have been exploiting a loophole of sorts to continue following users browsing with Firefox, which enabled its first-generation ETP by default in June 2019. ETP takes a hands-off approach for first-party cookies – those tied to the site being browsed – because to do otherwise would break many of those websites or require users to, say, log in each time they returned. Trackers exploited that. “Redirect tracking takes advantage of this to circumvent third-party cookie blocking,” Steven Englehardt, a Mozilla privacy engineer, said in an Aug. 4 post to a company blog. To do so, those practicing redirect or bounce tracking force users to “make an imperceptible and momentary stopover to their website” so that their trackers can be loaded as first-party and thus have their cookies stored by Firefox (for later reuse, as first-party cookies are). The redirect or bounce tracker than sends the user on to the latter’s destination website, now burdened with identifiers following them and reporting back to the first-party cookies. Mozilla In redirect or bounce tracking, the first website – a review site – briefly sends the browser to the redirect tracker to score a first-party cookie. The redirect tracker then sends the browser on to the user’s destination, in this case a retail site. Tracking accomplished. To short-circuit this trickery, Firefox’s ETP 2.0 regularly scrubs the browser of cookies and other site-specific data stored by known trackers. “This prevents redirect trackers from being able to build a long-term profile of your activity,” Englehardt wrote. ETP 2.0 doesn’t completely stop bounce tracking, as the cookies survive between ETP 2.0’s house cleanings. The interval between cleanings will be at least 24 hours, and if the browser is active throughout (as unlikely as that may be), up to and beyond 48 hours, because cookie and other site data storage will be cleared only when the browser is idle, according to a technical description of the new defense. ETP 2.0 is also supposed to steer clear of cookies tied to legitimate services, even if those cookies are served by trackers (another dodge by these web bloodhounds). Instead, Firefox will leave cookies be if the user has interacted with the site in the past 45 days, even if those cookies are used to conduct tracking. “This way you don’t lose the benefits of the cookies that keep you logged in on sites you frequent, and you don’t open yourself up to being tracked indefinitely based on a site you’ve visited once,” said Selena Deckelmann, vice president of Firefox desktop, in a different blog post. Firefox 79, which Mozilla released a week ago, can be downloaded from here for Windows, macOS and Linux. Related content news analysis Apple confirms it will open up the iPad in Europe this fall The latest efforts to comply with Europe’s Digital Markets Act mean developers can offer to side load apps to both iPhones and iPads in the EU. Apple has also taken steps to improve what it offers to smaller and non-commercial developers in the By Jonny Evans May 02, 2024 6 mins iPad Apple Mobile Apps news Udacity offers laid-off US workers free access to its courses for 30 days Sign-ups will be available over the next 30 days By Lucas Mearian May 02, 2024 4 mins Technology Industry IT Jobs IT Skills opinion Why you’ll soon have a digital clone of your own AI isn’t going to replace you at work. You will. By Mike Elgan May 02, 2024 7 mins Augmented Reality Generative AI Virtual Reality news analysis Workers with these AI skills are getting cash premiums As AI deployments become more critical to digital transformation projects, organizations are struggling to find skilled workers to support the new technology, so they're paying premiums for prospective hires or current employees who obtain the n By Lucas Mearian May 01, 2024 7 mins Generative AI IT Jobs IT Skills Podcasts Videos Resources Events SUBSCRIBE TO OUR NEWSLETTER From our editors straight to your inbox Get started by entering your email address below. Please enter a valid email address Subscribe