Silent audio processing on the AliExpress website was found helping to fingerprint visitors’ browsers without relying on cookies.

The issue only surfaced after a developer had trouble using multipoint Bluetooth headphones while an AliExpress tab was open: the headphones wouldn't switch properly from the…

Sawtooth waves you can't hear still mess with your Bluetooth. Firefox and Brave say they've got you covered

Is the technique outdated? Yes. Is it still creepy? Also yes.