Run the check
Play the same test tone at a safe low level and note the exact trigger.
Compare another source file and lower both system and app volume.
Reseat or change the cable or wireless link, then test another output device.
Read the result
Noise tied to one recording differs from noise across all sources on one connection.
Limits and next step
The browser cannot record what the headphones actually reproduce.
Repeat the check after changing one setting or connection. Keep a record of what changed before deciding whether the device needs service.