I would like Thunderbird to provide an option to display the size of each individual message directly in Cards View.
In Table View, there is a Size column, but in Cards View there is currently no way to see the message size directly on the card.
It would be very useful to have a “Show message size” option in the Cards View settings, displaying something like:
2.4 MB or 850 KB
This would be especially useful when cleaning up a mailbox and quickly identifying large messages without having to switch from Cards View to Table View