Emoji Requires Restart
Add emojis to your e-mails.
ThunderPEC Requires Restart
ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.
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
DL for Thunderbird Requires Restart
Allows to convert large attachments to links automatically without 3rd party providers.
Email signature for Thunderbird - WiseStamp Requires Restart
Switch Thunderbird email signatures. Supports Gmail, Yahoo, AOL & Outlook webmails. Youtube, Facebook, Twitter icons & more
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!
Extra Format Buttons Requires Restart
Adds a font size (in pixels), strikethough, subscript and superscript buttons to Thunderbird's Compose Window.
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.
Color Text Compose Buttons Requires Restart
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.
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).
Mail Merge Requires Restart Featured
Mass Mail and Personal Mail
Remembers the language you use with a person or group of people, and switches the spellchecker language automatically for you next time. You do not have to do it manually any more. It remembers and switches it for you.
Emoji Menu Requires Restart
Adds the ability to easily insert emojis into your composed messages in Thunderbird.
Markdown Here Requires Restart
Write your email in Markdown, then make it pretty.
Clippings Requires Restart
Save frequently-entered text for pasting later.
hubiC for Filelink Requires Restart
Add hubiC support to Thunderbird's Filelink feature.
SubSwitch Requires Restart
Simplify email categorization - it will be easier for you and others to manage mail. Define the set of prefixes for all emails you send or let SubSwitch to autodiscover it. While writing insert prefix to the title - choose one from your set.
Flexible Identity Requires Restart
Selects an identity based on the recipients list when sending an email
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.