First of all many thanks to all Thunderbird developpers!
My idea: I regret the absence of a shortcut to show remote content for a selected message.
To me, that would be useful since I disallowed remote contents by default.
With a shortcut I could easily show remote contents for irregular senders which are not on my exceptions list.
I tried to find a solution using the tbkeys-lite add-on but without success.
Kind regards,
Christoph