Add-ons
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Check your emails for spelling and grammar issues77,693 users -
Web Translate is easy to use translator for your Web browser / Thunderbird!55,699 users -
A Magyar Ispell helyesírási szótár a Hunspell helyesírás-ellenőrző programhoz készített nyílt forráskódú magyar szótár.9,322 users -
Australian English Dictionary for Mozilla applications.8,594 users -
![Icon for Grammalecte [fr] (for Thunderbird)](https://addons.thunderbird.net/user-media/addon_icons/809/809689-32.png?modified=1602750472)
Correcteur grammatical dédié à la langue française. Inclus : conjugueur, formateur de texte et dictionnaires orthographiques.7,470 users -
Diccionario corrector ortográfico de Español/México6,945 users
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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.263 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 language36 users
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Elevate your emails with AI! This tool analyzes selected text, corrects mistakes, and rewrites casual phrases into a confident, professional tone in seconds. (Requires a free Gemini API key)0 users -
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 for cloud LLM. Defaults to fast and cheap google/gemma-3n-E4B-it1 user -
L'extension améliore votre expérience de boîte de réception d'e-mails grâce au support IA (LLM).
* Résumé
* Traduction
* Explication
* Auto Tag
* Prompte personnalisé27 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.23 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103 users
See all 111 extensions in Language Support »
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