Paid extension & requires registration --> removed (for now).
This is not specified on your Firefox Add-ons description page (French version).
Be clear, guys! If you want to make money with your work, and this is more than fair, why don't you offer a completely and unlimited free version with short (and smart!) vocal adv inserts?
More listen time --> more advs --> more $!
Then, if someone wants to remove the adv inserts, he can subscribe & pay.
With friendship, and deep respect for your efforts,