That is some scary shit. The funny thing is, I can see my stats in the Firefox Adsense Plug in. Man, I hope I'm alright.
that's happened to me a few times and i about shat myself.. clear your cookies & cache, make sure you're using the right account name and try again.. try a different browser (like IE).. or a different computer.. if after all that you still can't log-in, i'd start to get worried..
That's shocked. but Firefox may update not yet therefore you could access stats from plug. Hope this is only your shock yourself there is nothing happen.