Nyob claims that Firefox is tracking users now instead of individual websites. Privacy-conscious users could consider this an improvement over traditional behavioral profiling with invasive cookies. However, Mozilla doesn't ask users for permission and enables the feature by default. The opt-out feature is similar to Google's Privacy Sandbox initiative, which promised to kill third-party cookies using browser-based tracking but failed.

While PPA is considered a less invasive tracking alternative in the US, Nyob stated, it still violates Europe's General Data Protection Regulation.