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Ukrainian dictionary

Ukrainian (uk-UA) spellchecking dictionary

Rated 5 out of 5 stars (58)
9,231 users

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General Catalan dictionary

Free Catalan (general version) spelling dictionary.

Rated 4 out of 5 stars (40)
12,391 users

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Canadian English Dictionary

For some reason, Mozilla doesn't have a Canadian localization team, but I know that even the British dictionary doesn't quite cut it for the truly patriotic.

Rated 4 out of 5 stars (82)
9,035 users

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Emoji

Add emojis to your e-mails.

Rated 4 out of 5 stars (64)
24,364 users

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German Dictionary, classical spelling standards

German Dictionary according to the classical spelling standards for spell-checking in Firefox and Thunderbird

Rated 5 out of 5 stars (20)
9,138 users

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Check and Send

Check the message contents and addresses before you send the message...

Rated 4 out of 5 stars (50)
19,651 users

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Russian Hunspell dictionary

Создан на основе словаря Лебедева. Файл аффиксов постепенно переписывается, словарь ежедневно пополняется. Релиз выкладывается один раз в месяц первого числа.

Rated 3 out of 5 stars (66)
9,999 users

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Confirm-Address

Confirm E-mail address before sending mail

Rated 4 out of 5 stars (75)
18,832 users

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Hungarian Dictionary

This extension is based on László Németh's Hungarian Dictionary

Rated 4 out of 5 stars (56)
8,906 users

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Český slovník pro kontrolu pravopisu

Slovník pro kontrolu pravopisu pro aplikace Mozilla

Rated 4 out of 5 stars (36)
15,257 users

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German Dictionary, extended for Austria

German dictionary (new Orthography) for spellchecking in Mozilla products, extended with Austrian words

Rated 5 out of 5 stars (22)
5,180 users

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XNote++

Persistent sticky notes associated to emails. You can fulltext search with constraints/email them/print/bookmark/copy to clipboard.

If you have a large screen, you can even display the notes outside of TB's main window, so it won't hide anything.

Rated 4 out of 5 stars (134)
15,526 users

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German Dictionary (Switzerland)

Dictionary with Swiss variants of German words for spellchecking in Mozilla products

Rated 5 out of 5 stars (3)
14,489 users

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Swedish Dictionary

Swedish spell-check dictionary.

Rated 5 out of 5 stars (22)
6,645 users

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Danish Dictionary for the Spell Checker

Danish dictionary for Firefox, Thunderbird and other Mozilla products.

Rated 3 out of 5 stars (25)
3,952 users

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Diccionario de Español/Chile

Diccionario corrector ortográfico de Español/Chile

Rated 5 out of 5 stars (4)
2,840 users

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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)
3,471 users

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AutoarchiveReloaded Featured

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

Rated 4 out of 5 stars (28)
22,987 users

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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)
23,362 users

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Arabic spell-checking dictionary

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

Rated 4 out of 5 stars (43)
634 users

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