Add-ons
Message and News Reading
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Snooze Ninja
Snooze emails like Gmail — but private and on your terms. Pick a wake time, the message moves to a Snoozed folder, and Thunderbird drops it back into your inbox when you need it. Your mail never leaves your machine. No telemetry, no cloud middleman.
JayBeeMailManager
Organize Thunderbird mail with flexible rules, previews, schedules, logs and undoable automation.
OmniSearch for Thunderbird
Fast, typo-tolerant email search with its own index. It finds mail Thunderbird's
built-in search misses, ranks the best matches first, and keeps itself up to date
as your mail changes. No internet access — everything stays on your computer.
Starred Sidebar by KoaSOFT
Adds a toolbar button that opens a panel listing every starred (flagged) email from all your accounts and folders in one place. Click any message to open it, or click its star to unstar—so nothing important slips away. Fast, private, all local.
CollectAddresses
Collect all sender/recipient/... addresses and store in an addressbook
BiDi Mail UI
Direction control and BiDi-related charset misdetection correction
Safe Trash Cleaner
Empties trash, junk and selected folders of selected Thunderbird accounts after confirmation.
CazAdjuntos
Automatically download and organize email attachments by sender, year and month. Filter by file type, sender and subject.
Correctify (FR)
Extension Thunderbird simple et rapide : sélectionnez du texte, faites un clic droit et corrigez-le instantanément. Idéal pour améliorer vos emails en un geste, sans ouvrir d’outil externe. Léger, pratique et ultra efficace.
Y!G Open With...
You may need to install https://yellowgnu.com/wp-content/uploads/2026/07/OpenLinkWith-Windows-Helper-1.0.3.zip
Install the XPI in Thunderbird, then extract and run install-host.bat from the Windows helper ZIP.
WashiBird
A cozy, paper-like theme (Light/Dark). Built as an extension to allow deeper UI customization than standard themes support.
Isabelle markup expander
Parse Isabelle escape codes and replace them by unicode representation
KIM Attachment Search
Sucht in KIM-Anhängen (XML/PDF/DOCX) und zeigt Meta-Daten
ThunderJira
A Thunderbird addon that integrates Jira directly into the email client. Supports Jira Cloud (atlassian.net) and Jira Server / Data Center (self-hosted).
AitoMail for Thunderbird
AitoMail for Thunderbird brings the power of local AI models directly into your email client. Select any email and instantly get a concise summary or a professionally drafted reply - all without sending your data to the cloud.
Vacation Responder
Automatic out-of-office reply: custom text, account(s), date window. Note: only works while Thunderbird is running.
Iris Mail AI
A Thunderbird extension that integrates AI assistance directly into the compose window, letting users draft replies, fix grammar, translate text, and adjust tone without leaving the email client.
SnoozeFlow
Snooze emails, set follow-up reminders, catch forgotten attachments.
All data stays local — no server, no subscription.
Requires Thunderbird to be running for on-time snooze alerts; overdue emails are recovered automatically on restart.
Magic Translator
Translate your emails directly in Thunderbird, reversibly, using Google Translate.Translate emails directly in Thunderbird — reversibly, on demand, via Google Translate. One click to translate, one click to restore the original.
SoundMail
Thunderbird add-on: play different new-mail sounds using rules (sender, domain, subject, body, regex), per-account & default sounds, drag-to-reorder priority, JSON import/export, and optional light/dark theme + UI language for the settings page.
To create your own collections, you must have a Mozilla Add-ons account.
