Comment 11 for bug 1738034

Oh, and by the way, often it does not even become red in the first place when some sound starts playing while the volume is muted.

Both becoming red and going back to normal are COMPLETELY UTTERLY RANDOM.

(or there's some logic behind it that is so convoluted that it is incomprehensible and renders the "feature" of becoming red, to notify you of something, completely useless)