@ sansonnet Rated 5 out of 5 stars
The "Greenbox" as you so eloquently put it, can be easily closed by clicking on the 'Close' text and 'X' icon on the bottom right corner of the 'box'.
As for the extension itself, it is a 5/5. Love the customizable options. Only wish the add-on bar control can be shifted to the top like ABP or something ;-)