Hello, I have been using Thunderbird with the Manually Sort Folders app for years. The ability to place folders and subfolders where I need them is essential for what I do. With the latest Thunderbird "upgrade", it was downgraded as the Manually Sort Folders app is no longer useable. Until Mozilla fixes it to where either the app can be used or Thunderbird is improved so that it will let me sort folders itself, I cannot upgrade. Please either render the Manually Sort Folders app useable again or make Thunderbird so that folder can be sorted. Thank you.