I would like an indication of the number of items in my "Junk" folder. As it stands now, I have no idea when Thunderbird has decided that something is "Junk," and since I'm a fairly new user, its filters are getting it wrong a lot. So I periodically have to go click on the "Junk" folder to see if there is anything in it. I'd far rather just be able to see it darkened with a number next to it, just like the inbox/drafts/trash/etc have.