To do this without a plugin:
- Close Thunderbird
- Backup your profile directory (and most especially
- Using the built-in config editor (or editing
prefs.js directly), find the
mail.accountmanager.accounts preference, and change the sequence of the comma-separated account references in it.
mail.accountmanager.defaultaccount and change it, if necessary, to be equal to the account you want to come first.
For example, if the value of
account4,account5,account12, reflecting a well-worn profile, and you want the third account to be first, change it to
account12,account4,account5. Then change
If you aren't sure which account is which, figure out which server configuration is right by looking for
N are different numbers), and then find
mail.account.accountM.server set to the correct
Inspiration for this answer came from Thunderbird/Change account order