User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/63.0.3239.132 Chrome/63.0.3239.132 Safari/537.36 Steps to reproduce: There are new feature in Thunderbird 58.0 beta: When composing a message, attachments can now be reordered (https://www.mozilla.org/en-US/thunderbird/58.0beta/releasenotes/). Could you make similar feature for mail accounts in the left side of Thunderbird? Now I have to scroll down for checking more important accounts. I can't move them to top, the only way is to remove top accounts and add them again for making them appear lower.

https://addons.mozilla.org/en-US/thunderbird/addon/folderpane-tools/ can do this for you.