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It is all zeros for me too again now, but I'm sure it will be fixed before long. But for those who have been without it for a couple of months I would suggest you update the version you are using. It worked for me.
It's a very basic tool the gives you the current days earnings, yesterday's total & month to date.
The problem is that while it got the first numbers when it installed it now doesn't seem to update. When I hit refresh it just stays at the old number even though the numbers have changed when I go directly to my AdSense account.
I can't figure out if it updates automatically or if you have to keep refreshing it.
Just went back to Google Gadgets & it has now disappeared from the list - very strange. I just removed it.
Does anyone know anything about it?
Oh, also note that the new version is only at the plugin's home page and is not yet on the mozilla extension site. To get to the home page, go to Tools / Add-ons, right click on the Adsense Notifier listing, and choose Visit Home Page. Once there, find Adsense Notifier in the nav bar and you're on your way.