Add-ons
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Check your emails for spelling and grammar issues79,998 users -
The best Translator for Thunderbird!
Supported translators:
Google Translate
Microsoft Translator
DeepL
Yandex
Яндекс Переводчик
Google 翻译
百度翻译58,752 users -
This extension is based on László Németh's Hungarian Dictionary9,551 users -
Australian English Dictionary for Mozilla applications.8,428 users -
![Icon for Grammalecte [fr] (for Thunderbird)](https://addons.thunderbird.net/user-media/addon_icons/809/809689-32.png?modified=1602750472)
French grammar checker. Included: conjugation tool, text formatter and spelling dictionaries.7,705 users
Top Rated See all »
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Word translation in tooltip with English⟷Croatian dictionary already incorporated.0 users -
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.261 users -
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.15 users -
CantoFish is a popup Cantonese-English dictionary for Firefox. It contains over 200,000 entries and works with both traditional and simplified Chinese characters. The Yale and Jyutping romanization systems are supported, as well as Mandarin pinyin.0 users -
Ћирилично/латинично пресловљавање, виртуална ћирилична тастатура - Serbian Cyrillic/Latin transliteration and Virtual Cyrillic keyboard0 users -
An easier management of the user interface language41 users
Recently Added See all »
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Inline grammar suggestions while composing email. You bring your own LLM via an Open AI-compatible provider, including local LLM; tested with LM Studio on Ubuntu and together.ai Defaults to google/gemma-3n-E4B-it1 user -
The add-on enhances your email inbox experience through AI (LLM) support.16 users -
AI-powered email assistant for Thunderbird. Write, polish, and translate emails. Get smart summaries of unread messages. Works with OpenAI, DeepSeek, or custom providers.22 users -
Review your emails with AI before sending in Thunderbird.
Gemini Mail Review uses Google Gemini to check tone, clarity, grammar, and common email mistakes and improve writing.
送信前にAIでメールをレビュー。
Google Geminiで文法・トーン・明瞭さ・メールの問題点を Thunderbird 上でチェック91 users -
One click translate with DeepL API (or Google Translate as backup).124 users
See all 110 extensions in Language Support »
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