Welcome to Thunderbird Add-ons.
Add extra features and styles to make Thunderbird your own.Close
True "Send Later" functionality to schedule the time for sending an email.
Mail Merge Featured
Mass Mail and Personal Mail
Save frequently-entered text for pasting later.
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!
Check the message contents and addresses before you send the message...
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.
ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.
Confirm mail address and attachments based on flexible rules.
Transliterator No Restart
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.
Write your email in Markdown, then make it pretty.
Adds a font size (in pixels), strikethough, subscript and superscript buttons to Thunderbird's Compose Window.
How many time you sent an email from your wrong email address?
This add-ons allows you assign a different color to the compose window border for each of your email addresses. So you can immediately view from what account are you writing.
Switch Thunderbird email signatures. Supports Gmail, Yahoo, AOL & Outlook webmails. Youtube, Facebook, Twitter icons & more
Insert smilies in messages.
Adds the ability to easily insert emojis into your composed messages in Thunderbird.
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.
Automatic Dictionary No Restart
Extension that remembers the language of the spellchecker used when composing and switches to it every time you write to that person.
Save your email into Evernote by forwarding it to Evernote email address.
Before you use it, you need to specify your Evernote email address (see the screenshot).
This function can be invoked by "Forward to Evernote" in the context menu.
Category manager for CardDav contacts, also allows to send an email to all members of a category (categories can be used as contact groups).
Adds Text Color Buttons in Compose Toolbar and More: Pixel FontSize, Strikethough, Sub & Superscript, Lower & UpperCase. Also provide Tools: Insert iframe, Launch MathType, Maths & Greek Symbols, Load Template Variables and Duplicate Compose Window.