Media Player for YouTube™ provides a comprehensive player UI to allow you to control YouTube playback through Firefox toolbar panel, which is very useful if you're watching YouTube while reading other websites.
1. Set preferred video playback volume for all videos
2. Control auto-play behavior of the YouTube player
3. Play a single video or playlist in loop-mode
4. Change video player theme color (see options page)
5. Integrated with YouTube account Playlist (sign-in required, see Options page)