Clippings Requires Restart
Save frequently-entered text for pasting later.
Mail Merge Requires Restart Featured
Mass Mail and Personal Mail
Send Later Requires Restart
True "Send Later" functionality to schedule the time for sending an email.
Emoji Requires Restart
Add emojis to your e-mails.
Stationery Requires Restart
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!
Markdown Here Requires Restart
Write your email in Markdown, then make it pretty.
ThunderPEC Requires Restart
ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.
Check and Send Requires Restart
Check the message contents and addresses before you send the message...
SmartTemplate4 Requires Restart
SmartTemplate4 offers an easy way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every account as well as for the default (all email accounts). Also supports the Stationery Add-on.
Email signature for Thunderbird - WiseStamp Requires Restart
Switch Thunderbird email signatures. Supports Gmail, Yahoo, AOL & Outlook webmails. Youtube, Facebook, Twitter icons & more
Emoji Menu Requires Restart
Adds the ability to easily insert emojis into your composed messages in Thunderbird.
AVIM Requires Restart
Vietnamese-language input method editor (IME). Type diacritics directly into any Web page, Web app, or dialog box. Convenient, comprehensive, secure.
Bộ gõ tiếng Việt cho phép đặt dấu trực tiếp vào bất kỳ trang Web, ứng dụng Web, hộp thoại.
MEGAbird Requires Restart
Add MEGA support to Thunderbird's Filelink feature.
Send Later Button Requires Restart
A simple button to invoke the (already existing) send later functions.
Highlighter Requires Restart
Quickly highlight some text in Thunderbird message composing windows.
CategoryManager 2 Requires Restart
Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).
Extra Format Buttons Requires Restart
Adds a font size (in pixels), strikethough, subscript and superscript buttons to Thunderbird's Compose Window.
As-you-type phonetic conversion of text from one alphabet to another, as well as transliteration/detransliteration of selected text anywhere within documents. Supports multiple languages and custom transliteration schemes.
ThunderHTMLedit Requires Restart
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.
CryptoData Requires Restart
Easily and quickly to encrypt / decrypt:
Private messages via e-mail, blogs, social networks, forums, websites, images, etc
Support: Firefox, Thunderbird and SeaMonkey