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Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.
This add-on is free software. However, after a while it will request to make a donation. People who have paid the minimum suggested contribution (US$ 5.99) will receive a license code to stop further reminders.
Original idea by Łukasz 'Arivald' Płomiński, author of the Stationery add-on.
Based on Ace HTML editor, https://ace.c9.io/.
HTML icon by PelFusion (www.pelfusion.com).
Note: I liked the font preview in the font indicator that 'Stationery' provides. So I included it here, too.