I don't like the fact that you are using this website http://convert2mp3.net/ which has already its plugin, the website started for some months now to throw adwares and virus. their owners are ignoring the website completly
We use convert2mp3 for the conversion, but our workflow is much better than in their own add-on. We've released an update today so that parts of the website are blocked, which are loading popups. So feel free to update and enjoy with a clean workflow and layout. And would be great if you could update your rating.
