Thanks to the Google Operating System blog, I now understand why my Gmail Notifier Firefox plugin stopped working suddenly this past week. Evidently, my Gmail account received an update recently. I wasn’t aware of this, but the update includes IMAP support, which is slick. I wouldn’t mind using Thunderbird for email, but I really prefer to just use the Gmail website since I like that interface more than any other email client I’ve ever used.

So, mystery solved. Hopefully the add-on developer can get a fix together for the new Gmail. Until then, I guess I can just manually check my email. Ugh.