[xiaomai]

It's uploaded to your device (router / raspberry pi / etc.), it doesn't go to mozilla or other 3rd parties.

[sirtoffski]

Thanks! Totally did not pay enough attention.

[pbhjpbhj]

At present. Maybe all the routers get auto-enrolled in a 'voluntary' program in the future??

Mozilla have shown they're not trustworthy in such situations; I think it will take a couple more years to see if they've learnt from their indiscretions.