Review for Buttons! by Rescuefire
Rated 4 out of 5 stars
What this is supposed to do I used to have. Found it to be gone. Downloaded this add on and it still isn't working. Aside from being more than a little annoyed that next and previous are not a base part of Thunderbird, I'm really annoyed that I can't get this function back.
To create your own collections, you must have a Mozilla Add-ons account.