Add-ons
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Check your emails for spelling and grammar issues74,961 users -
The best Translator for Thunderbird!
Supported translators:
Google Translate
Microsoft Translator
DeepL
Yandex
Яндекс Переводчик
Google 翻译
百度翻译54,621 users -
This extension is based on László Németh's Hungarian Dictionary8,304 users -
Australian English Dictionary for Mozilla applications.7,786 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.6,863 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.218 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.11 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 language29 users
Recently Added See all »
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Underlines the mistakes a LanguageTool server reports in the compose window. You choose the server, and nothing is ever sent to any other third-party service.0 users -
Insert any of 682 accented letters into a message as you write it, from a searchable popup in the compose window. Works offline: nothing is sent anywhere and no data is collected.1 user -
Fixes Greek HTML messages that incorrectly declare charset=MSWIN1253 by decoding those MIME parts as windows-1253 for display only. Special fix for emails from EKDDA0 users -
Translate the message you are reading or your own reply into your language using Google, Microsoft, DeepL, or Yandex. Bring your own API key.85 users -
AI bilingual email translation: original and translated paragraphs side by side, streaming, 4 view modes. Uses your own OpenAI/DeepSeek/Claude/Ollama endpoint; keys encrypted on-device, mail goes only to your provider. No data collection.0 users -
Easily write emails mixing Right-to-Left languages (like Arabic, Persian, Hebrew) with Left-to-Right languages (like English). Automatically formats your text as you type.16 users
See all 121 extensions in Language Support »
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