Twitch Live Viewer от LordSuppe

This extension lets you see which of your followed Twitch channels are currently live – directly in your browser.

It also provides optional on-screen notifications (with sound, if enabled) whenever one of your streamers goes live.

You can customize where the notifications appear on your screen – top-left, bottom-right, or anywhere you prefer.

Stay up to date with your favorite streamers without even opening Twitch!