Gray icon Rated 4 out of 5 stars

What do you think if the icon is gray when no mail and red (as it should be) when at least one there? So it would be more similar to other user interface icons
Look: http://www.imagehost.it/di-WU9B.png

This review is for a previous version of the add-on (1.48). 

Hi.

You can customized your icons in every way by CSS. But you need some knowledge about addon and CSS. There is an explanation in CSS file of gmail watcher (You need to extract it from xpi file and need some more knowledge).