Add-ons
Newest Extensions
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thundervim
Vim keybindings for editing email in the Thunderbird compose window.
Compose Recipient Analyzer
Analyzes To and Cc recipients in the Thunderbird compose window.
ENIGMA Axiom — Mail Assistant
Drafts your replies in the Thunderbird compose window, using the conversation, your notes and your own goals. Sorts what arrived by what needs answering. Nothing is sent unless you send it — or until you switch on automatic replies yourself.
SoloSend
From the compose window, send your email to many recipients one at a time, with a delay between each — or schedule it for later.
CalmSignal
Compose-time wellness nudges for Thunderbird. On-device heuristics while you write — rules can update quietly in the background. Optional account linking for dashboard sync. Your email body stays private.
Duplicate Email Remover
Finds and removes duplicate emails across your Thunderbird folders using the Message-ID header for reliable matching, with a subject/sender/date/size fallback for the rare message that lacks one. Allows individual folder scan inclusion/exclusion.
Linux Entra Bridge
Entra ID SSO for Thunderbird on Linux. A native messaging host bridges to the local microsoft-identity-broker, reusing the device SSO session for Microsoft 365 / Exchange (Conditional Access outside Edge). Companion host required.
Alkateb
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.
CleanMail
Email inbox cleanup: sender statistics, bulk deletion, newsletter unsubscribing, and automatic cleanup rules.
FileLink for Gokapi
Utilisez votre instance Gokapi comme fournisseur FileLink pour les pièces jointes de Thunderbird.
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.
Undo Send Queue
Gmail-style Undo Send for Thunderbird — delay outgoing mail 5–60 seconds and cancel before it goes out .
configurable delay, undo from notification/queue, dark mode, no network, no telemetry
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.
SupuReply
Respuestas predefinidas y plantillas de correo en la ventana de redacción. Inserta respuestas rápidas con un clic: pack por categorías, plantillas propias, variables y CSV.
Table Border
Define automaticamente border=1, cellpadding=3 e cellspacing=0 na tabela HTML onde o cursor está posicionado, direto na barra de formatação da janela de composição.
JayBeeMailManager
Organize Thunderbird mail with flexible rules, previews, schedules, logs and undoable automation.
Missing Attachment Warner Plus
Thunderbird's built-in reminder checks one language with a fixed list. This warns in 9 languages, lets you add your own trigger words, and only interrupts right before sending.
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.
Markdown Paste
Paste Markdown (GitHub Flavored) into a Thunderbird compose window and see it rendered as formatted rich text instantly. Also includes a toolbar button to render/un-render the whole draft.
To create your own collections, you must have a Mozilla Add-ons account.
