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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)
691 users

Sieve

This Extension implements the ManageSieve protocol for securely managing Sieve Script on a remote IMAP server...

Rated 4 out of 5 stars (49)
485 users

Romanian spellchecking dictionary

Romanian spellchecking dictionary for Firefox.

Rated 4 out of 5 stars (40)
3,623 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 (23)
3,361 users

Türkçe Yazım Denetimi

Türkçe Yazım Denetimi
Turkish Spellchecker

Rated 5 out of 5 stars (39)
1,766 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)
312 users

German dictionary (de_AT)

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

Rated 5 out of 5 stars (5)
2,752 users

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.

Rated 4 out of 5 stars (2)
1,743 users

Croatian Dictionary (Hrvatski Rječnik)

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

Rated 5 out of 5 stars (9)
3,306 users

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)
2,649 users

Google Keep Tab

Adds a button to open Google Keep in a new Tab

Rated 5 out of 5 stars (29)
3,799 users

Bulgarian Dictionary

Bulgarian spellchecking...

Rated 5 out of 5 stars (30)
4,021 users

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)
6,878 users

Afrikaans spell checker

Afrikaans spell checker for Mozilla Firefox and Thunderbird

Rated 4 out of 5 stars (23)
1,350 users

German dictionary (de_CH)

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

Rated 5 out of 5 stars (4)
3,422 users

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)
2,078 users

Norsk bokmål ordliste

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

Rated 4 out of 5 stars (14)
2,243 users

Latviešu valodas pareizrakstības pārbaudes vārdnīca

Latvian spellchecker

Rated 5 out of 5 stars (13)
2,654 users

Bengali (Bangladesh) Dictionary

Bengali Bangladesh (bn-BD) spell checking dictionary.

Rated 5 out of 5 stars (44)
29 users

Windows Taskbar Unread Badge

Put an unread mail count badge on the Thunderbird icon in the Windows taskbar.

Rated 4 out of 5 stars (43)
430 users