good, but came up with a filtered solution Rated 3 out of 5 stars

I only wanted notifications for specific emails, which this currently does not provide. After some searching, I ended up using another extension 'FiltaQuilla' (which allows you to create a filter to launch a program) along with GrowlNotify (http://www.growlforwindows.com/gfw/help/growlnotify.aspx).
Hope this helps others who need to filter out their notifications.