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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)
3,854 users

Svenska Fria Ordlistan

Ett verktyg för stavningskontroll. Ordlistan har utvecklats ideellt utan stöd från de språkvårdande institutionerna. Använd den på egen risk.

Rated 5 out of 5 stars (22)
6,788 users

Dansk ordbog til stavekontrollen

Dansk ordbog til stavekontrollen i mails, forums, blogs osv. til Firefox, Thunderbird og andre Mozilla-programmer.

Rated 3 out of 5 stars (25)
4,140 users

Diccionario de Español/Chile

Diccionario corrector ortográfico de Español/Chile

Rated 5 out of 5 stars (4)
3,169 users

English - Greek Spelling dictionary

Ελληνικό-Αγγλικό ορθογραφικό λεξικό για ευκολότερο ορθογραφικό έλεγχο σε δίγλωσσα κείμενα για Firefox - Thunderbird και Seamonkey

Rated 4 out of 5 stars (74)
3,801 users

AutoarchiveReloaded Featured

Archiviert E-Mails automatisch (Verbesserte Version vom "Autoarchive" Add-on)

Rated 4 out of 5 stars (25)
24,506 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)
15,731 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)
24,867 users

Arabic spell-checking dictionary

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

Rated 4 out of 5 stars (43)
680 users

United States English Spellchecker

This dictionary is no longer maintained.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

Rated 4 out of 5 stars (207)
5,363 users

Grammalecte [fr] (for Thunderbird)

Correcteur grammatical dédié à la langue française. Inclus : conjugueur, formateur de texte et dictionnaires orthographiques.

Rated 4 out of 5 stars (16)
6,795 users

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).

Rated 4 out of 5 stars (89)
10,770 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)
754 users

Corector ortografic pentru limba română

Corector ortografic pentru limba română

Rated 4 out of 5 stars (40)
4,562 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)
4,147 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)
7,981 users

Türkçe Yazım Denetimi

Türkçe Yazım Denetimi
Turkish Spellchecker

Rated 5 out of 5 stars (39)
2,088 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)
373 users

Wörterbuch Deutsch (de_AT)

Deutsches Wörterbuch igerman98 (de_AT, Österreich, "neue" Rechtschreibung), für Firefox, Thunderbird, Seamonkey.

Rated 5 out of 5 stars (5)
3,248 users

Edit Email Subject (EES)

This module allows you to change/edit email subjects

Rated 4 out of 5 stars (122)
8,422 users