Add-ons
Message Composition
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Magic Voice Scriber
Smart semantic voice dictation inspired by Google Rambler: removes filler words, auto-corrects on the fly, and formats clean emails right under your cursor in Thunderbird.
ExcelHTML Fixer
Preserves Microsoft Excel table formatting when copying and pasting tables into Thunderbird email messages.
ThunderSnippet
Canned replies for Thunderbird: type a key like po1 and press Tab, or search your snippets. Fields like {{PONUMBER}}, recipient names, dates, attachments and Quicktext import.
kDrive for FileLink
Uploads large attachments to Infomaniak kDrive and inserts a share link into the message.
Télécharge vos pièces jointe dans un dossier Kdrive et insert un lien unique dans le message.
Send Later
Set aside a message you are writing and send it later from a dedicated local folder.
MailChat for Thunderbird
Connect Thunderbird to local Codex chats: search mail, manage attachments and prepare replies with history. Drafts by default; optional autonomous sending.
Auto Switch Dictionary
Automatically switch compose spellcheck dictionaries using fast Markov-style language detection.
HTML Template Sender
Save HTML email templates and use them in one click. Start a new message from a template or fill an open draft, and import many .html files or a whole folder at once. Everything stays on your computer.
OpenLanguageToolClient
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.
Pixel Track for Thunderbird
Add a tracking pixel to outgoing emails in Thunderbird, allowing you to monitor when recipients open your messages.
Accent Letters — type á é í ó ú ñ in email
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.
FileLink for FileSender
Adds FileSender as a Thunderbird FileLink provider, so large attachments are sent as download links instead of attached directly. Works with any FileSender (https://filesender.org) instance you have an account on.
Table Formatter
Table formatting tools for Thunderbird. Full control over the border, including thickness and border styles (solid, dashed, dotted, or none).
Asyntai AI Reply Assistant
Draft replies to customer emails with AI, using your Asyntai knowledge base. Save helpful emails to the knowledge base with one click.
csv2mail
Import CSV files to generate personalized email drafts, open compose tabs, or send directly in Mozilla Thunderbird.
AI Writing Assistant
Improve your emails with AI right inside Thunderbird compose window. Supports OpenAI, Google Gemini, Groq, and self-hosted models. Click "Improve Writing" to refine tone, style, and formatting. Customizable prompts and settings. Privacy-friendly.
LocalMail Tools
Local AI for your emails. Privacy-focused AI tools for Thunderbird. Write, proofread, translate and summarize emails using local models through Ollama, LM Studio or an OpenAI-compatible server. Customize prompts and keep control of your data.
Easy Table Editor by Cardella
An easy visual table editor for Thunderbird's HTML composer, with drag selection, formatting, resizing, headers, templates and saved models.
Provided as-is; the author is not responsible for loss or unintended results.
Template Inserter
Adds a button to Thunderbird's compose window for inserting saved templates from the corresponding email account, including their attachments, directly into a message.
Auto DSN
Aktiviert automatisch die Zustellstatusbenachrichtigung (DSN) und/oder Lesebestätigung (MDN) für ausgehende E-Mails in Thunderbird.
To create your own collections, you must have a Mozilla Add-ons account.
