Welcome to Thunderbird Add-ons.
Add extra features and styles to make Thunderbird your own.Close
Mail Merge Featured
Mass Mail and Personal Mail
Save frequently-entered text for pasting later.
True "Send Later" functionality to schedule the time for sending an email.
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!
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.
Check the message contents and addresses before you send the message...
ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) in Thunderbird.
Write your email in Markdown, then make it pretty.
An input method editor (IME) for Vietnamese. Type Vietnamese diacritics directly into any Web page, Web app, or dialog box.
Bộ gõ tiếng Việt cho phép đặt dấu trực tiếp vào bất kỳ trang Web, ứng dụng Web, và hộp thoại.
Switch Thunderbird email signatures. Supports Gmail, Yahoo, AOL & Outlook webmails. Youtube, Facebook, Twitter icons & more
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.
Adds a font size (in pixels), strikethough, subscript and superscript buttons to Thunderbird's Compose Window.
Category manager for CardDav contacts, also allows to send an email to all members of a category (categories can be used as contact groups).
Easily and quickly to encrypt / decrypt
For users: private messages via e-mail, blogs, social networks, forums, etc.
For webmasters: websites, images, photos, etc.
Support: Firefox, Thunderbird and SeaMonkey
Add hubiC support to Thunderbird's Filelink feature.
Adds the ability to easily insert emojis into your composed messages in Thunderbird.
Allows to convert large attachments to links automatically without 3rd party providers.
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.
Insert smilies in messages.
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.