Add-ons
Appearance and Customization
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Copy My Email
Copy my email address to clipboard
Adds right-click menu item on mailbox or any folder belonging to mailbox. Copies selected mailbox address to clipboard.
Zoom Button for Thunderbird (Redux+)
Fixed-width zoom extension with custom configuration options dashboard & one-handed mouse zooming.
AttachmentIMG Panel
Shows images attached to an email as resized thumbnails in a list on the right side of the message preview, and lets you click to rotate, enlarge and save them.
S/MIME Indicator
Marks S/MIME encrypted and signed-only messages in the Tags column.
Table Formatter
Table formatting tools for Thunderbird. Full control over the border, including thickness and border styles (solid, dashed, dotted, or none).
Feed Sentry
Point Feed Sentry at any link and it tells you whether the page serves a real RSS or Atom feed, what kind, and how many items it lists right now. A quick way to find a site's followable feeds before you subscribe.
PlainCopy
Copy selected text as clean plain text without formatting, soft hyphens, zero-width characters, or non-breaking spaces.
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.
Multi Sign Editor
Attach Print All
Adds a button and a context menu to print all email attachments with a single click.
Merlin
A Thunderbird add-on for saving links and pages to Merlin, a cross-platform read-it-later app backed by either a Nextcloud instance or an standalone server. Save a link straight from an email to your Merlin reading list via the context menu.
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.
One-Click Mail Copier
This add-on allows you to copy various email details—such as the subject, date and time sent, and body (plain text)—to the clipboard all at once with a single click.
CodeSnap - Generate Code Images
Turn code on any webpage into beautiful images. Select, right-click, and customize in seconds.
Caveman Mode — ChatGPT, Claude & Gemini
Make ChatGPT, Claude, and Gemini speak like a smart caveman. Less filler, fewer tokens, same substance.
ChromaKit - Pick Color from Any Website
All in one tool to Pick, convert, and export colors or assets from any webpage.
Alarm - Reminders & Notifications
A simple and reliable browser alarm extension. Create alarm and never miss important tasks, meetings, or events
Screenshot - Instant Screenshot Saver
Capture screenshots instantly with one click
BIMI Result Viewer for Thunderbird
Displays BIMI-related authentication results for the currently displayed message in a toolbar popup. This version uses only standard Thunderbird MailExtension APIs.
To create your own collections, you must have a Mozilla Add-ons account.
