How do I create a button from a menu item?
I added the Copy Sent to Current add-on to my Thunderbird v. 68.4.1. The add on created several new menu items. Now I would like to make buttons out of them to use when sending a message. When I right-click "customize", none of the menu items are available. How do I do this?
Opaite Mbohovái (2)
Addons are not created by Thunderbird, but often people can advise if they use that addon themselves.
As you are talking about a specific addon, perhaps it might be useful to contact the author.
https://addons.thunderbird.net/en-US/thunderbird/addon/copy-sent-to-current/ The link above to the addon page also has the 'Support Website' and 'Support Email'.
Phoenity Buttons adds several buttons, although maybe not the ones you want.