Rated 5 out of 5 stars
This small extension/addon doesn't do all that much, but what it does do (rearrange folders and set the default) is extremely important. I've been using Thunderbird for years, since converting from Eudora, and have not been able to change the order in which my accounts appear in the folder-pane, nor set the default. I've tried editing the userprefs.js and it does not take, or the changes appear random -- not sure why, it's pretty straightforward looking. This little bit of code fixed it first time, hoo-rah. I give it a high mark! /..
PS: I use Thunderbird 5.0 now, and this is the version I for which I installed and used FolderPane.