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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.)
Arabic spell-checking dictionary
Arabic spell-checking dictionary for Firefox 3 and Thunderbird 3 from Ayaspell.
United States English Spellchecker
This dictionary is no longer maintained. Use this dictionary instead.
Grammalecte [fr] (for Thunderbird)
French grammar checker. Included: conjugation tool, text formatter and spelling dictionaries.
Allow HTML Temp
Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).
Nederlands (nl) Language Pack
Brazilian Portuguese Dictionary (Former Spelling)
The same spellchecker shipped with the Brazilian version of Firefox, just using the former spelling (which is valid until January 1st 2016).
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.
German dictionary (de_AT)
German dictionary igerman98 (de_AT, Austria), for Firefox, Thunderbird und Seamonkey.
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*Shrunked Image Resizer is no longer maintained.*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)
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.
ReplyWithHeader
Croatian Dictionary (Hrvatski Rječnik)
Croatian Dictionary (Hrvatski Rječnik) for Mozilla Firefox, Thunderbird and SeaMonkey
To create your own collections, you must have a Mozilla Add-ons account.
