Last night I was working with AirPods in, and a shopping tab froze everything I had Notion, Slack, and AliExpress open on my desk, AirPods paired to both my laptop and phone. The moment AliExpress loaded, the headphones glitched out. Turned out: AliExpress was secretly running something called "audio fingerprinting" in the background — it makes your browser play a tiny silent audio loop to identify your device, and along the way it hogs your computer's Bluetooth audio channel. When you're using multipoint (headphones connected to both laptop and phone at once), it just keeps yanking the connection. I'm not technical. It took me days to figure this out. At one point I was convinced my AirPods battery had gone bad and I was about to buy new ones — turns out it was my browser. This isn't unique to AliExpress, but among shopping sites it's the worst offender. Back when I was doing TikTok Shop product research, I had it open 10+ hours a day — basically free labor for them.

What is audio fingerprinting? Who's already hit this Short version: when you open the site, it uses your browser's built-in audio API to silently generate a "sound signature unique to your device," used to track you — even if you clear cookies or switch accounts. People around me who've hit this: - Awei (Awei) runs an independent-site product research setup, has AliExpress open 8 hours a day. His AirPods Pro battery life dropped from 6 hours to 3. - Xiaomin (Xiaomin) is a remote illustrator, wears the WH-1000XM5 paired to a MacBook and iPad, and the moment she opens AliExpress her iPad drops the connection. - Lao Zhou (Lao Zhou) does Amazon operations, rotates between three browsers to check competitors, and his Bluetooth speaker keeps switching tracks on its own all night. They all thought it was a hardware issue, until someone opened the browser's "Task Manager" and saw that one tab's CPU was pegged the whole time.

Replicate it today: 0 money, 5 minutes, one plugin Cost: $0. Time: 5-10 minutes. Barrier: install a small browser extension. First step: go to the Chrome / Firefox / Edge extension store, search for uBlock Origin (a free ad blocker that also blocks tracking scripts), and click install. Three concrete steps: 1. Install uBlock Origin — its default settings already block most tracking scripts 2. For extra coverage, install the AudioContext Fingerprint Defender extension, built specifically for audio fingerprinting 3. As a habit: dedicate one browser to AliExpress (e.g., Chrome for work, Brave for product research), physically separated from your work browser I now use Brave for shopping sites and Firefox + uBlock Origin as my main. One month in, headphones haven't glitched once. If you don't do cross-border e-commerce and don't use AliExpress, totally fine to close this tab. But if you regularly work with Bluetooth headphones on, keep this in your back pocket — next time your headphones mysteriously stutter, check whether some tab is silently playing "silent audio."

For whatever stage you're at Just starting / haven't done cross-border yet: Don't worry about this now. When you actually start product research, install uBlock Origin in advance — build the habit early. Already have 1-2 clients and shop on these sites daily: Strongly suggest doing this today. Brave + uBlock Origin is the simplest combo. Your Bluetooth headphones will last longer, and you won't get random audio stutters mid-work. Scaling up, team of 3-5: Write "shopping sites get their own browser" into team SOP. I saw a 4-person team waste 2-3 hours every week debugging headphone issues — turned out to be the exact same cause.