Chinese multinational tech giant Alibaba has been accused of tracking web users after a developer discovered its global online marketplace running hidden audio processes that could be used for sophisticated audio fingerprinting. While investigating an issue with his wireless headphones, Matt Callaghan found that opening an AliExpress webpage in Firefox or Chrome interfered with the multipoint Bluetooth audio feature.
As Callaghan explains in his blog post, “Normally the PC takes priority playing audio, with my phone being able to play audio when nothing is playing on the PC. Usually I listen to music on my phone but with notifications or YouTube playing through the PC.” However, shortly after loading the AliExpress homepage, audio from his phone would stop playing, despite no media playing on his PC. Closing the AliExpress tab immediately fixed the issue, while muting the tab, browser, or Windows did not seem to resolve it.
