I follow the updates, because of security, but many add-ons, just don’t work any more.
For example:
“Account Colors” Great
“FoxClocks” Great
“Get all mail button” Great
“LocalFolders” Great
It is easy to say it is up to the developers, but if you keep changing everything, there will soon be no more add-on’s.
I like Thunderbird and have used it for more 30 years, but am starting to think it is time to change.
Regards