Rated 4 out of 5 stars
This is an excellent add-on, which I use daily. It would be great if the developers add the option of having additional notes (more than four). In addition, beginning with Firefox 6 and up to 9, and also in the new 0.7 beta version, existing notes open at the bottom and not top of the note.This review is for a previous version of the add-on (0.6.0.10).
In the new 0.7 version are 6 notes and in the options dialog you can choose how will be existing notes opened by checking/unchecking "Insert text on the top of note" function.