Дополнения

Provider for Google Calendar от Philipp Kewisch

Provider for Google Calendar connects Thunderbird with Google Calendar for full task sync, conference details, and scheduling support. It offers deeper integration than Thunderbird’s native support using Google’s official API.

Enigmail от Patrick Brunschwig

OpenPGP-совместимое средство для шифрования и цифровой подписи сообщений в Thunderbird и Seamonkey.

Manually sort folders от Jonathan Protzenko, Itagaki Fumihiko

Расширение, которое позволит вам изменить порядок сортировки папок в панели папок Thunderbird.

gContactSync от Josh Geenen

gContactSync - add-on, позволяющий синхронизировать ваши Google-контакты с Адресной Книгой Thunderbird 2 или 3.

Quicktext от John Bieling

Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.

Remove Duplicate Messages от Eyal Rozenberg

Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).

Mail Redirect от Onno Ekker, Pawel Krzesniak

Позволяет перенаправлять ("перепослать") сообщения другим адресатам.

Thunderbird Conversations от Jonathan Protzenko, Standard8

This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.

Signature Switch от Achim Seufert

Switch the signature on/off or choose a new one from your predefined set.

CompactHeader от jmozmoz

Add symbol in header plane to switch between compact and expanded view. Work only for Thunderbird 68.0 and older. Currently, there are no plans to update this for newer versions.

Lightning Calendar Tabs от jlx84

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.

QuickFolders (Tabbed Folders) от Realraven (Axel Grude), Alexander Malfait

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!

Stationery от Arivald

Extension to mimic Outlook Express Stationery.
Allow you to use HTML files as templates for mail. Also allow custom template in replies or forwarded mail!

quickFilters от Realraven (Axel Grude)

Создавайте фильтры сообщений "на лету", перетаскивая сообщения и анализируя их атрибуты.

Примечание подборщика THE outil de filtrage (semi-) automatique de courriels : copier, déplacer ou taguer (étiqueter), rien ne l'arrête :D

Check and Send от H.Ogi

Check the message contents and addresses before you send the message...