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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)
20,476 users

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Signal Spam

Add simple functions to report spams or phishing to Signal Spam by one click.
The add-on will also alert you if you open a fraudulent e-mail (phishing).

Rated 3 out of 5 stars (181)
15,123 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)
9,799 users

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SmartTemplates Featured

SmartTemplates offers an easy and powerful way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every mail identity, Stationery files can now be imported and used directly.

Rated 4 out of 5 stars (81)
3,584 users

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Confirm-Address

Confirm E-mail address before sending mail

Rated 4 out of 5 stars (75)
19,406 users

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Hungarian Dictionary

This extension is based on László Németh's Hungarian Dictionary

Rated 4 out of 5 stars (56)
7,902 users

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Český slovník pro kontrolu pravopisu

Slovník pro kontrolu pravopisu pro aplikace Mozilla

Rated 4 out of 5 stars (36)
13,841 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)
4,872 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 (135)
14,836 users

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Russian (ru) Language Pack

Russian (ru) Language Pack

Rated 3 out of 5 stars (5)
44,108 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)
12,442 users

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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)
3,152 users

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Swedish Dictionary

Swedish spell-check dictionary.

Rated 5 out of 5 stars (22)
6,169 users

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Polski (pl) Language Pack

Polski (pl) Language Pack

Rated 3 out of 5 stars (7)
43,097 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)
3,654 users

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Diccionario de Español/Chile

Diccionario corrector ortográfico de Español/Chile

Rated 5 out of 5 stars (4)
2,781 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)
2,868 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)
22,675 users

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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 (103)
15,446 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)
24,143 users

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