This is not limited to Bluetooth in any way. In pavucontrol I can see Firefox outputting audio when on AliExpress even though nothing is playing. The uBlock filter fixed it.

▲ ErrorNoBrain an hour ago | parent [-]

> The uBlock filter fixed it.

what filter ?

▲ prima-facie an hour ago | parent [-]

From the article:

To block the scripts open the uBlock dashboard, select My filters, and add:

    ! AliExpress AWSC fingerprinting scripts
    ||assets.aliexpress-media.com/g/AWSC/uab/*/collina.js$script,domain=aliexpress.com
    ||assets.aliexpress-media.com/g/AWSC/fireyejs/*/fireyejs.js$script,domain=aliexpress.com