QuickFolders (Tabbed Folders) Requires Restart Featured
The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.
See new mail at a glance after automatic filtering - supports quickFilters addon!
LocalFolders Requires Restart Featured
Add as many local folders as you want to.
New folders can reside on mapped or network locations.
Works with both TB60 through TB68
Signature Switch Requires Restart Featured
Switch the signature on/off or choose a new one from your predefined set.
ThunderHTMLedit Requires Restart Featured
Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.
Grammar Checker Requires Restart Featured
Checks grammar using LanguageTool.
Zombie Keys (Multilanguage Keyboard) Requires Restart Featured
Enter accents, diacritics, diaeresis, umlauts, ligatures etc. with keyboards of various countries (us,uk,ie,fr,it,ru,de,sv) - via easy to remember shortcuts or menu. Also supports all textboxes of the application (such as search, filters).
Send Later Requires Restart Featured
True "Send Later" functionality to schedule the time for sending an email.
TbSync Requires Restart Featured
TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.
Send Later Button Requires Restart Featured
A simple button to invoke the (already existing) send later functions.
ImportExportTools NG Requires Restart Featured
Adds tools to import/export messages and folders (NextGen)
ExQuilla for Exchange Requires Restart Featured
Thunderbird email accounts connecting to Microsoft Exchange Web Services.