YouTube Center contains all kind of different useful functions which makes your visit on YouTube much more entertaining.
Here are the features of this great add-on:
- Download YouTube videos
- Remove ads on YouTube
- Resize the YouTube player to your own custom size.
- Repeat the video
- Auto select quality
- Prevent auto play/buffering of videos
- Rearrange the buttons.
- Turn lights off button
Check out more about this add-on at the Firefox Add-ons website.