Thank you for the confirmation. Hmm, let's try reinstalling/updating the drivers.
Open Device Manager (Windows + X > Device Manager).
Expand Sound, video, and game controllers.
Right-click your audio driver (e.g., Realtek High Definition Audio) and select Update driver.
If no updates are available, choose Uninstall device and restart your computer to let Windows reinstall the driver automatically.
Test audio playback in your browser again.