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British English Dictionary

British English Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey by David Bartlett.

To enable, right-click in a multi-line text box, select "Languages", then "English / United Kingdom".

Rated 3 out of 5 stars (413)
2,020 users

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ReminderFox Requires Restart

ReminderFox displays and manages lists of reminders and tasks. ReminderFox uses easy-to-use lists with warnings/alarms to remind you of all your important appointments.
Synchronize ReminderFox with other calendars as well.

Rated 4 out of 5 stars (550)
2,528 users

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Ukrainian dictionary

Ukrainian (uk-UA) spellchecking dictionary

Rated 5 out of 5 stars (58)
9,168 users

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General Catalan dictionary

Free Catalan (general version) spelling dictionary.

Rated 4 out of 5 stars (40)
11,054 users

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Metal Lion Sea Monkey Requires Restart

Metal Lion meets SeaMonkey.

Rated 5 out of 5 stars (10)
133 users

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ThunderPEC Requires Restart

ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.

Rated 4 out of 5 stars (38)
338 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)
8,737 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)
8,859 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 (65)
9,767 users

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Hungarian Dictionary

This extension is based on László Németh's Hungarian Dictionary

Rated 4 out of 5 stars (56)
7,765 users

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Český slovník pro kontrolu pravopisu

Slovník pro kontrolu pravopisu pro aplikace Mozilla

Rated 4 out of 5 stars (36)
12,990 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)
4,914 users

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Awesome Auto Archive

Automatically do Archive/Copy/Delete/Move actions based on user defined rules

Rated 4 out of 5 stars (46)
273 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)
12,826 users

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Swedish Dictionary

Swedish spell-check dictionary.

Rated 5 out of 5 stars (22)
6,107 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)
3,737 users

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Diccionario de Español/Chile

Diccionario corrector ortográfico de Español/Chile

Rated 5 out of 5 stars (4)
2,674 users

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Master Password+ Requires Restart

Various enhancements for build-in "master password" (MP)
-Locks master security device on demand or after specified time
-Prompts for MP on browser startup
-Suppresses all or duplicate MP prompts
-Locks up entire application or individual windows

Rated 4 out of 5 stars (186)
183 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)
3,263 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)
648 users

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