Using this extension you can also control page layout as well as the player behaviours like:
1. Stop player from buffering media
2. Change quality to HD (HD2160p, HD1440p, HD1080p, HD720p)
3. Prevent the player from displaying annotations
4. Prevent the player from starting the next track when the current one is finished
For more info please visit:
http://add0n.com/control-center.html
Logs:
0.5.1: adds a new feature: Buffer video without starting it
0.5.2: the popup is now displayed when there is an open YouTube page. No buffering functionality is improved.
0.5.3: Supports YouTube history