Add-ons
Message Composition
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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.
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.
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.
Paperless-Connector
Store e-mails and attachments in Paperless-ngx – as a PDF with the original embedded, or as-is – and insert Paperless documents into new messages as an attachment or share link.
Occurrence_Highlighting
Double-click a word to highlight all its occurrences - in the compose editor and in the message view.
FileLink For Synology FileStation
Use Synology NAS File Station as a Thunderbird FileLink storage provider.
You do not need to set up a separate cloud server on the Synology NAS.
Roam Virtual Office Activity
Shows a Roam external activity while a Thunderbird email compose window is open.
Forward Subject Tagger
Automatically adds a custom tag to the subject line when forwarding emails based on the original sender.
Quick Workflow Bar
Prepare recurring emails as complete workflows directly above the message body.
To create your own collections, you must have a Mozilla Add-ons account.
