Best Thunderbird Extension Ev-a
Having borked my junk mail folder in thunderbird recently, I realised that I was quite behind, running on 1.0.something, instead of the 1.5.something that is current. In the upgrade I noticed the main panel had developed a nasty habit of selecting the next message when I junked one. To be fair, it did this when you had the mail-to-be-junked selected in the old version, but not if you hadn’t any message selected, which means you could click the little junk dot in the mail list for a bunch of messages without it selecting (then marking as read) anything. This changing was Frustrating.
Luckily, someone else has come up aginst roughly the same problem, and created the entirely spiffing unselect extension, which not only fixes the issue, but also doesn’t select the next message if you junk a currently selected one, which is even betterer.