Hello,
An idea that I would like to suggest is to integrate into Thunderbird a possibility to empty all the trash of the different accounts presents. Also the possibility after emptying to compress the trash.
For those who know, this is the basic principle of xpunge extension. Empty and compress all or part of the trash and junk folders. I have been using this extension for several years, but like many others, the developers do not all have the means to follow the evolutions of thunderbird, the development methods changing regularly.
Thank you for taking my idea into consideration.