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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.

Rated 5 out of 5 stars (49)
3,907 users

Swedish Dictionary

Swedish spell-check dictionary.

Rated 5 out of 5 stars (22)
6,525 users

Danish Dictionary for the Spell Checker

Danish dictionary for Firefox, Thunderbird and other Mozilla products.

Rated 3 out of 5 stars (25)
4,064 users

Diccionario de Español/Chile

Diccionario corrector ortográfico de Español/Chile

Rated 5 out of 5 stars (4)
3,379 users

English - Greek Spelling dictionary

English-Greek spell-checking dictionary for Firefox, Mozilla thunderbird and Seamonkey mail for easier spell checking in bilingual text.If you need better spelling results try the respective stand-alone...

Rated 4 out of 5 stars (74)
3,778 users

AutoarchiveReloaded Featured

Automatically archives old mails (Improved version of the orginal Autoarchive Add-on)

Rated 4 out of 5 stars (25)
24,727 users

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.

Rated 4 out of 5 stars (100)
15,795 users

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.)

Rated 4 out of 5 stars (11)
24,260 users

Arabic spell-checking dictionary

Arabic spell-checking dictionary for Firefox 3 and Thunderbird 3 from Ayaspell.

Rated 4 out of 5 stars (43)
650 users

United States English Spellchecker

This dictionary is no longer maintained. Use this dictionary instead.

Rated 4 out of 5 stars (207)
5,388 users

Grammalecte [fr] (for Thunderbird)

French grammar checker. Included: conjugation tool, text formatter and spelling dictionaries.

Rated 4 out of 5 stars (16)
6,728 users

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).

Rated 4 out of 5 stars (6)
812 users

Romanian spellchecking dictionary

Romanian spellchecking dictionary for Firefox.

Rated 4 out of 5 stars (40)
4,496 users

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

Rated 4 out of 5 stars (22)
4,160 users

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).

Rated 5 out of 5 stars (23)
7,976 users

Türkçe Yazım Denetimi

Türkçe Yazım Denetimi
Turkish Spellchecker

Rated 5 out of 5 stars (39)
2,063 users

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.

Rated 3 out of 5 stars (7)
377 users

German dictionary (de_AT)

German dictionary igerman98 (de_AT, Austria), for Firefox, Thunderbird und Seamonkey.

Rated 5 out of 5 stars (5)
3,323 users

Edit Email Subject (EES)

This module allows you to change/edit email subjects

Rated 4 out of 5 stars (122)
8,529 users

Croatian Dictionary (Hrvatski Rječnik)

Croatian Dictionary (Hrvatski Rječnik) for Mozilla Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (9)
4,726 users