TabBeep — Âm báo tắt/mở tab âm troch Ekhon

TabBeep — Audio tab mute/on/off sound: Description: plays a short sound when a tab changes state from "playing audio" to "muted" or vice versa. Features: toggle sound on/off, choose sounds (3-4 patterns), domain filter to indicate only to certain sites. Why it's useful: know immediately which tab starts/plays audio without looking for the little speaker icon. Technical tip: listen for tabs.onUpdated combined with audible flag.