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This is not working correctly. I have Thunderbird 60.8.0. I just tried this....used "Edit Source" to type a note next to text in a message. When I finished and re-opened the message, the note I typed is not there, not anywhere on the page. However, when I went to "Edit Source" again, the text I typed is still there.
Also, this says the original (unedited) message will be moved to "Trash," but I cannot find the message in any of my "Trash" or "Deleted Items" folders. (However, the supposedly edited version is in my inbox, so I didn't lose anything.)
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