The author found that Alibaba's security scripts run WebAudio fingerprinting quietly on the AliExpress homepage, which keeps the computer's audio channel active and causes Bluetooth headphones to fail switching back to the phone.

The author ran into a strange issue: Bluetooth headphones support multi-device connection and work fine normally, but as soon as the AliExpress page is opened, the phone's sound stops, and closing the page immediately restores it. Muting the tab doesn't help either, and there is no visible video or music on the page.

1. The 'silent band' hidden in the page

The author installed a 'monitor' on the page and discovered that AliExpress secretly creates two audio processing contexts, both running and connected to the system's audio output. However, the volume is set to zero, so users hear nothing. That's the problem: the browser thinks the page is playing audio, so it keeps occupying the computer's audio channel.

2. Not a prank, but 'fingerprinting'

These two scripts belong to Alibaba's anti-abuse tools. They not only use audio but also collect a large amount of data such as canvas, WebGL, hardware information, and interaction behavior, to 'take a photo' of the browser and identify whether you are a human or a bot. Audio is just one of them, but it inadvertently interferes with hardware.

3. How to fix it? Add two blocking rules

The author used uBlock Origin to block these two scripts, and the page displays normally without any audio contexts. However, after blocking, you may encounter more CAPTCHAs because this is part of the anti-fraud system.