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Signature Switch
Switch the signature on/off or choose a new one from your predefined set.
Greek spellchecking dictionary
Greek spellchecking dictionary Mozilla (Firefox- Thunderbird- Seamonkey)
European Portuguese Spellchecker
Lightning Calendar Tabs
Displays tabs which allows quick navigation between time periods in Lightning calendar. All views of calendar are supported. Color of tab texts can be adjusted.
British English Dictionary
British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey by David Bartlett.
To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".
QuickFolders (Tabbed Folders)
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!
Ukrainian dictionary
General Catalan dictionary
Canadian English Dictionary
For some reason, Mozilla doesn't have a Canadian localization team, but I know that even the British dictionary doesn't quite cut it for the truly patriotic.
Emoji
Addressbooks Synchronizer
Synchronizes selected addressbooks with other instances of thunderbird
using local files, webdav servers or imap servers
German Dictionary, classical spelling standards
German Dictionary according to the classical spelling standards for spell-checking in Firefox and Thunderbird
Russian Hunspell dictionary
Создан на основе словаря Лебедева. Файл аффиксов постепенно переписывается, словарь ежедневно пополняется. Релиз выкладывается один раз в месяц первого числа.
SmartTemplates
Featured
SmartTemplates offers an easy and powerful way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every mail identity, Stationery files can now be imported and used directly.
Confirm-Address
Hungarian Dictionary
Český slovník pro kontrolu pravopisu
Slovník pro kontrolu pravopisu pro aplikace Mozilla
German Dictionary, extended for Austria
German dictionary (new Orthography) for spellchecking in Mozilla products, extended with Austrian words
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