Simple YouTube MP3 Button

This plugin will add a "Download MP3" button to all videos.
The main benefits of this plugin:

- You won't have to leave the video to download the MP3
- The MP3 will always be converted to the highest audio quality that the video offers.
- There's no stress on your computer since the conversions take place online
- The plugin doesn't slow your browser down since the button is added asynchronously

I thought it was pretty annoying to be sent to another page and all that additional hassle so I looked for a solution that allowed everything to take place on the same page. I really hope that you'll like it and if there's anything that needs to be improved then please let me know. :)

Thanks to ialc, arjuna and YouTube In MP3 for helping me create this plugin.