Ever wanted to re-order your Thunderbird accounts?
You can either modify the prefs.js manually
1. Exit Thunderbird if its running.
2. Locate your prefs.js file (default location is c:\users\[your account]AppData\Thunderbird\Profiles
3. create a backup , just in case.
4. Open the prefs.js in any text editor and look for: user_pref("mail.accountmanager.accounts", "account1,account2,account3,account4…"); line
5. Change the order of the accounts manually
6. Restart Thunderbird
OR
1. Download and install the FolderPane add-on.
2. From Thunderbird, select Tools->Add ons –> Folderpane and reorder the accounts using the “Move Up” and “Move Down” buttons.
3. Close and restart Thunderbird.
The choice is yours.