私が、Thunderbird に追加している拡張機能（addons.thunderbird.net）の全て：
*cloud - FileLink for Nextcloud and ownCloud
Auto Address Cleaner T
Automatic Dictionary
Birthday Calendar
BorderColors D
CardBook
Check and Send
Colored Diffs
Compact Headers
Config Button
Copy Message ID
Darko
DeepL selected text
Empty Folder
Enigmail
FileLink Provider for Box
Folder Pane View Switcher
Full Address column
Identity Chooser
LookOut (fix version)
Mail Merge
Manually sort folders
Minimize on Close
No Message Pane Sort
Previous Colors
Quicktext
Quote Colors
Remove Duplicate Messages
Restart Button
ScrollAnywhere
Signature Switch
Spam Scores
Tag Popup
TbSync
ThirdStats
Thunderbird Conversations
Web Translate
XNote++