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This add-on connects your text editor with Thunderbird's email compose window, allowing you to edit the message in the text editor.
A demo screencast using Vim-Ghost:
Please visit the website for the original browser add-on, GhostText, to get the idea.
Since synchronization uses the GhostText protocol, your text editor needs to have a GhostText server function. This means you need to install a plugin on your text editor's side to listen for connections from Thunderbird.
For a list of supported text editors, please see the original GhostText website or Ghostbird's README.
(The author has successfully run it on VSCodium, VSCode, Vim, Notepad++ (via GhostText-Any), and Notepad (via GhostText-Any))
This add-on is still in beta. Editing is not bidirectional like the original GhostText; While editing in your text editor, the Thunderbird compose window will become read-only.