Starting with Firefox 127, we're enabling a new anti-tracking feature in Nightly: Bounce Tracking Protection.
This detects bounce trackers based on redirect behavior and periodically purges their cookies & site data to prevent tracking.
https://bugzilla.mozilla.org/show_bug.cgi?id=1846492
We’re working on a new anti-tracking feature: Bounce Tracking Protection. It works similar to the existing Cookie Purging feature in Firefox, but instead of a tracker list it relies on heuristics to detect bounce trackers.
It’s based on the navigational-tracking-protections spec draft in the PrivacyCG[1]
Source: https://blog.nightly.mozilla.org/2024/05/09/screenshots-these-weeks-in-firefox-issue-160/
[1] https://privacycg.github.io/nav-tracking-mitigations/#bounce-tracking-mitigations