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Automatic Dictionary
Remembers the language you use with a person or group of people, and switches the spellchecker language automatically for you next time. You do not have to do it manually any more. It remembers and switches it for you.
Tag Toolbar / Tag Popup
AutoarchiveReloaded
Featured
Automatically archives old mails (Improved version of the orginal Autoarchive Add-on)
FiltaQuilla
Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.
FlexConfirmMail
Confirm mail address and attachments based on flexible rules.
(This project was renamed from "Flex Confirm Mail" to "FlexConfirmMail", due to a branding reason.)
Grammalecte [fr] (for Thunderbird)
French grammar checker. Included: conjugation tool, text formatter and spelling dictionaries.
G-Hub Lite
Google Tabs for Thunderbird! G-Hub Lite supports Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need Google Workspace support (formerly G Suite)? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro
CategoryManager
Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).
CardDAV Browser
A utility to browse vCards stored on a CardDAV server.
This version is only for Thunderbird. There is a SeaMonkey version available if needed.
Shrunked Image Resizer
Make your photos smaller, so they don't take forever to email.
*Shrunked Image Resizer is no longer maintained.*
Edit Email Subject (EES)
Xpunge
Empties the Trash and Junk folders, and compacts folders in multiple Thunderbird accounts.
Lightning Invitation Notifier | LIN
This extension is an extension to Mozilla Lightning for Thunderbird.
It shows a toast message and opens the invitations window when an invitation arrives.
Google Keep Tab
Folder Pane View Switcher
Folder view arrows; switch to "All Folders" view when hovering during drag & drop; allow user to select which views are enabled or tied to the view arrows.
Quick Folder Move
When filing messages, a search box will show up allowing you to quickly enter the folder name you want to move to.
If no search term is entered, a list of recent folders will show up instead.
Identity Chooser
Identity Chooser helps you to always use the correct identity when composing a new email.
Attach from Clipboard
ThreadVis
Displays a small graphic visualising the context (thread) of the currently selected email.
To create your own collections, you must have a Mozilla Add-ons account.
