Firefox 69 arrives and now blocks third-party tracking cookies, fingerprinting, and cryptomining by default
Mozilla today launched Firefox 69 for Windows, Mac, Linux, and Android. Firefox 69 blocks third-party tracking cookies and cryptomining by default.
Context & Ripple Effects
This is the payoff of a promise Mozilla made a year earlier, when it said Firefox would block web trackers by default in stages starting with Firefox 63 and 65. The intermediate steps are all in the coverage: cryptomining and fingerprinting protection first shipped as opt-in features in Firefox 67, and third-party cookie blocking began rolling out in June before Lockwise landed on desktop alongside it.
What changes with Firefox 69 is the switch from opt-in to default: every user on Windows, Mac, Linux, and Android now gets third-party tracking cookies, fingerprinting, and cryptomining blocked without touching settings. The next release, Firefox 70, extends the same playbook to social trackers and turns blocking into a visible feature with a personalized privacy report.
First-order effects
- Every Firefox 69 user immediately stops leaking third-party tracking cookies and fingerprinting signals to ad-tech and analytics scripts by default, shrinking the observable audience for cross-site trackers on roughly a quarter of web sessions where Firefox is the client.
- Cryptominers lose their default execution path in the browser, forcing sites that monetized via hidden mining scripts to either disclose and ask permission or lose that revenue channel on Firefox.
Second-order effects
- Ad-tech firms whose targeting depends on third-party cookies must maintain fallbacks for Firefox traffic or accept degraded match rates there, while Google faces growing pressure to explain why Chrome still allows what Firefox blocks by default.
- Mozilla converts privacy from a settings toggle into a marketing surface — Firefox 70's personalized tracker-block report is the direct follow-on, making the number of blocked trackers itself a retention feature against Chrome and Safari.
Third-order effects
- If each release keeps moving defaults stricter, the browser consolidates its role as the de facto regulator of the tracking economy — access-layer power shifting from advertisers to whoever ships the client, ahead of formal legislation.
- A tracking-free-by-default baseline normalizes consent-free browsing expectations, squeezing ad-tech business models built on invisible third-party collection and pushing publishers toward first-party data strategies.
The trend: Browsers are becoming the enforcement layer for web privacy, with Mozilla shipping default protections release by release and turning blocked-trackers visibility into competitive differentiation.