ChronoTick от Latif

Countdown Timer is a lightweight, user-friendly extension that helps you track time with:

⏱️ Accurate countdowns (HH:MM:SS format)
🔊 Customizable sound alerts (tick sound + alarm)
🔇 Mute/Volume control with persistent settings
⏰ Desktop notifications when time's up
🔄 Continues running even if the popup is closed
✅ Transparent versioning (displays version in UI)