I've just found this add-on and it's great - just what I needed. Congrats to the developers. I'm using Firefox v8 and it works fine.

However, I have 1 small niggle. I've added an icon to the taskbar and I have both icons and text displayed. In this mode the number of emails is displayed in the middle of the text, not in the envelope icon. It can't be read very well when mixed up in the text so it would be good if it could be changed to show in the envelope icon only. If the taskbar shows icons only it's shown OK in the middle of the envelope.

Thanks