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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)
740 users

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Romanian spellchecking dictionary

Romanian spellchecking dictionary for Firefox.

Rated 4 out of 5 stars (40)
4,350 users

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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 (23)
3,759 users

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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 (25)
7,361 users

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Türkçe Yazım Denetimi

Türkçe Yazım Denetimi
Turkish Spellchecker

Rated 5 out of 5 stars (39)
2,043 users

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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

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German dictionary (de_AT)

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

Rated 5 out of 5 stars (5)
3,160 users

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Edit Email Subject (EES)

This module allows you to change/edit email subjects

Rated 4 out of 5 stars (125)
7,991 users

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ReplyWithHeader

Outlook style headers and few goodies for Thunderbird.

Rated 5 out of 5 stars (93)
10,977 users

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Croatian Dictionary (Hrvatski Rječnik)

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

Rated 5 out of 5 stars (9)
4,265 users

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Lithuanian spelling check dictionary

Lithuanian spellchecking dictionary for Mozilla applications. Included by default in Lithuanian localized versions of Mozilla software.

Rated 5 out of 5 stars (5)
2,957 users

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Google Keep Tab

Adds a button to open Google Keep in a new Tab

Rated 5 out of 5 stars (29)
4,325 users

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Identity Chooser

Identity Chooser helps you to always use the correct identity when composing a new email.

Rated 4 out of 5 stars (147)
6,079 users

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Bulgarian Dictionary

Bulgarian spellchecking...

Rated 5 out of 5 stars (30)
4,737 users

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Spanish (Venezuela) spell check dictionary

Diccionario en español para Venezuela.
- Corrector Ortográfico (Spell Checker)
- Tesauro de Sinónimos (Thesaurus)
- Separación Silábica (Hyphenation)

¡Hecho en Venezuela!

Rated 5 out of 5 stars (30)
7,792 users

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Afrikaans spell checker

Afrikaans spell checker for Mozilla Firefox and Thunderbird

Rated 4 out of 5 stars (23)
1,567 users

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German dictionary (de_CH)

German dictionary igerman98 (de_CH, Switzerland), for Firefox, Thunderbird und Seamonkey.

Rated 5 out of 5 stars (4)
4,224 users

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German Dictionary (de-DE), classical and reformed

German Dictionary according to the classical or reformed spelling standards for spell-checking in Firefox and Thunderbird ++
Deutsches Wörterbuch nach den bewährten oder reformierten Regeln für die Rechtschreibprüfung in Firefox und Thunderbird

Rated 5 out of 5 stars (7)
2,251 users

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Norsk bokmål ordliste

Norsk bokmål ordliste for Mozilla Firefox, Mozilla Thunderbird og SeaMonkey.

Rated 4 out of 5 stars (14)
2,745 users

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Latviešu valodas pareizrakstības pārbaudes vārdnīca

Latvian spellchecker

Rated 5 out of 5 stars (13)
3,203 users

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