Language Support

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SmartQuotes

Applies the correct smart quotes („ ... “ instead of " ... ") used in Lithuanian, German, Czech, and other Central European languages. One click fixes your entire text.

Not yet rated
3 users
Added June 14, 2025

New UNEC

New UNEC is a browser extension that transforms the UNEC student panel into a modern and user-friendly interface. It dynamically replaces the existing webpage’s HTML, CSS, and JS with an improved design, featuring automatic dark mode, language.

Not yet rated
25 users
Added Feb. 10, 2025

AutoReplace

This AddOn offers a function of autocorrection / auto text replacement. You can save a shortcut and a replacement and it will replaced automaticly if you type your new eMail text.

Not yet rated
95 users
Added Sept. 25, 2024

Hawk (Like ChatGPT in your emails)

Hawk for Thunderbird is an AI-powered plugin designed to generate clear and personalized emails, translate content, fix grammar errors, and streamline your email communication workflow.

Rated 5 out of 5 stars (2)
400 users
Added July 19, 2024

Antidote connector for Thunderbird

Integrate Antidote with Thunderbird to proofread your emails, check your spelling and grammar, and consult the dictionaries and language guides. Get alerted to abrasive tone and missing attachments before sending a message.

Not yet rated
1,039 users
Added June 19, 2024

Copy Timestamp

Copy the timestamp and/or email addresses of the sender, recipient, etc. to the clipboard in various formats.

Not yet rated
46 users
Added May 12, 2023

Aify

Rewrite or generate text based on promps using OpenAI's API.

Configure on settings page (make sure to save) and start to use when writing your emails!

You must have a payment method on record with OpenAI and an API key. OpenAI charge for use.

Rated 5 out of 5 stars (10)
416 users
Added May 11, 2023

AI Anywhere for ChatGPT

Press "Alt + i" or use context menu to quickly access:
- ChatGPT (OpenAI)
- GitHub Copilot (Microsoft)
- Claude (Anthropic)
- Gemini (Google)
- Grok (X)
- Mistral
- Perplexity
- DeepSeek (深度求索)

Rated 5 out of 5 stars (14)
5,186 users
Added Jan. 11, 2023

10ten Japanese Reader (Rikaichamp)

Look up Japanese words with the hover of a mouse.

After enabling the add-on from the toolbar (or press Alt+R) simply hover over Japanese text and a popup displays corresponding dictionary definitions.

Rated 5 out of 5 stars (4)
228 users
Added June 6, 2022

AddAccents

This extension allows you to easily insert accented characters as you type in firefox or thunderbird. It is similar to abctajpu (no longer supported). With the default settings, simply press "e" followed by "\" to insert "é" "a\" to insert "à" etc...

Rated 5 out of 5 stars (3)
171 users
Added May 10, 2022

Grammar, Proofreading & Spell Checker

Check the grammar and spelling directly inside Thunderbird using Wordeep technology

Rated 4 out of 5 stars (4)
758 users
Added Jan. 24, 2022

skypewebapp

Adds browser action icon to toolbar to open Skype. See https://thunderbird-essentials.thomas-bandl.de/wordpress/2020/10/04/skype/

Rated 3 out of 5 stars (2)
41 users
Added Aug. 21, 2021

✨ Awesome Emoji Picker ✨

Modern, nice emoji picker that you can use to find and select emojis. It will be copied to your clipboard or even directly inserted into the e-mail, when you click on it.

You will certainly like it.

Rated 5 out of 5 stars (11)
5,234 users
Added Aug. 10, 2021

Unicodify – Text transformer

Easily and quickly transform text to “Unicode fonts” and change the casing.

Rated 5 out of 5 stars (3)
457 users
Added Aug. 10, 2021

Grammar and Spell Checker — LanguageTool

Check your emails for spelling and grammar issues

Rated 4 out of 5 stars (39)
66,510 users
Added July 26, 2021

Charset Menu

Restores the charset menu removed in Thunderbird 91 and fixes an issue in Thunderbird 78.

Rated 4 out of 5 stars (9)
5,017 users
Added June 3, 2021

Ungender

Eine Thunderbird-Erweiterung, welches Binnen-Is und Ähnliches von Webseiten entfernt. Es basiert auf der bekannten Firefox Erweiterung Binnen-I be gone.

Rated 4 out of 5 stars (5)
195 users
Added May 23, 2021

Read Aloud: A Text to Speech Voice Reader

Read aloud the selected email messages using text to speech (TTS). Read Aloud is intended for users who prefer to listen to content instead of reading, and those with dyslexia or other learning disabilities.

Rated 4 out of 5 stars (7)
858 users
Added March 7, 2021

Text Insert: Templates/Instant Spell Check

Email composer:

*Upper case the first letter of nouns, names, or words at sentence start
*Android(TM) like spellcheck/suggest alternatives (DE, EN, ES, FR,NL)
*Insert styled text, images, tables with shortcuts
*Define shortcut-replacements.

Rated 3 out of 5 stars (7)
209 users
Added Feb. 26, 2021

Web Translate

The best Translator for Thunderbird!

Supported translators:
Google Translate
Microsoft Translator
DeepL
Yandex
Яндекс Переводчик
Google 翻译
百度翻译

Rated 4 out of 5 stars (35)
49,288 users
Added Oct. 11, 2020