Global-media-controller от Rohit ANand

Global Media Controller lets you control all media playing in your browser from one convenient popup.
Features:
- Control YouTube, Spotify, SoundCloud, and any HTML5 media
- Play/Pause, Skip Forward/Back, Previous/Next Track
- Volume control and mute toggle
- Progress bar with seeking support
- See album artwork and track info
- Keyboard shortcuts for quick control
Keyboard Shortcuts:
- Ctrl+Shift+Space - Toggle play/pause
- Ctrl+Shift+, - Seek backward 10s
- Ctrl+Shift+. - Seek forward 10s
No data is collected. Open source at: https://github.com/R0h1tAnand/Firefox-Media-Control