A recent investigation found AliExpress running hidden WebAudio code that processes audio even when no sound is playing.
The behavior appears related to audio fingerprinting, using how a device processes audio to help distinguish it from others.
Interestingly, it was discovered when a user noticed AliExpress interfered with their Bluetooth multipoint headphones. Closing the AliExpress tab fixed the issue.
The audio was set to zero gain, so nothing was audible, but the browser was still processing the audio graph.
Why it matters: WebAudio can potentially be used for fingerprinting without an obvious indication to the user, raising privacy and transparency concerns.
Source: https://blog.laserphile.com/2026/08/aliexpress-webpage-keeping-multipoint.html
Safari on iOS, not sure how Firefox on my Linux desktop compares because I am unmotivated to get up and check it right now. Maybe later if I remember!
Apple browsers tend to all have the same few fingerprints (which is a good thing), since the hardware between most Apple devices are so similar. Your vanilla Firefox on the other hand will likely have a unique fingerprint.