As of Thunderbird 115+ (tested on 138.0), users are unable to manually sort or reorder the order of their email accounts in the left folder pane. Previously, the "Manually Sort Folders" add-on offered this functionality, but it is no longer compatible with current Thunderbird versions. For users with multiple accounts (e.g. 5–10+), being able to define the account order is essential for workflow clarity and navigation. Alphabetical or custom ordering would be sufficient. Please consider restoring native support for manual account reordering or offering a built-in account sort feature in future releases.