Adsense Notifier
If you need to check your adsense stats “every three seconds” you should install Adsense Notifier extension for Firefox!
“Adsense Notifier simply shows your adsense stats on the status bar and updates the stats automatically. This is wonderful for anyone with OCD ( or GAD as some have called it ) who needs to check their stats every three seconds to see if they have gotten any more clicks :-p”
read more and download it at: mincus code ยป Adsense Notifier