[afiori]

> but when I go to about:studies, I see that I have never participated in any studies

Are you in the US? I also have not participated in any studies but in the preferences it is marked as active. My guess would be that they either run very few of them or are restricted to the US.

[kop316]

I am in the US. It was disabled by default in Debian, but it is on in Windows. It looks like I have not participate din any studies on the Windows machine.

[esperent]

No, Vietnam.