After I had installed Firefox 1.5 on my notebook, I went to Mozilla Extensions to look for some plug-ins. I found this: Gmail Manager. Previously I was using Gtalk as my Gmail Notifier but sometimes I found it was a bit ‘heavy’ (drained some resources) to run on my notebook. Gmail Manager is more light-weight. Since I didn’t use Gtalk as the messenger so it is OK for me to use Gmail Manager.
I installed Adsense Notifier 0.7 for Firefox too but it seems to have conflict with Gmail Manager. Most of the time, the stats doesn’t show up. The programmer of Gmail Manager or Adsense Notifier might take note on this.