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Single Domain

Warns if you send mail from or to a specified domain. If there are multiple accounts in your profile, you can isolate one so that you can't send mail to that domain from outside or vis versa without warning.

Rated 5 out of 5 stars (4)
105 users

Српски речник - Serbian Dictionary

Српски правописни речник - Serbian (Cyrillic and Latin) spellcheck dictionary

Rated 4 out of 5 stars (27)
908 users

Frisian Words list

Frisian Words list

Rated 3 out of 5 stars (4)
223 users

Expertspam

Report spam, false-positives or phishing back to your antispam provider.

Rated 2 out of 5 stars (11)
171 users

Received

Displays the "Received" header parsed with a regular expression.

Rated 5 out of 5 stars (4)
156 users

Geiriadur Cymraeg

Welsh MySpell Dictionary - The word-list was created as part of the Cysill software, developed by Canolfan Bedwyr, University of Wales, Bangor.

The Mozilla addon is a separate piece of work simply to connect the dictionary to Mozilla products.

Rated 5 out of 5 stars (7)
146 users

RemindIt

Help in reminding mails to be answer or sent again. Choose a reminder date for each received or send message that are highlighted in the message list, depending on their status (expired, soon to exprire, to be reminded). Sending a reminder is eased.

Rated 3 out of 5 stars (27)
695 users

Finnish Spellchecker

Finnish (fi-FI) spellchecker dictionary for Firefox, Thunderbird and SeaMonkey .

Rated 3 out of 5 stars (9)
449 users

Esperanta Vortaro

en: Esperanto dictionary for Firefox;

eo: Esperanta Vortaro por Firefox;

Rated 5 out of 5 stars (7)
244 users

Zulu spell checker

Your Zulu spell checker allows you to check spelling in Zulu and avoid typing errors.

Now you don't need to see your Zulu text underlined in red and you can be proudly South African.

Rated 5 out of 5 stars (1)
12 users

Russian spellcheck dictionary (yo). Based on AOT.

Russian spellchecker dictionary. Based on works of AOT.ru group. (only yo)

Rated 5 out of 5 stars (4)
116 users

Albanian Dictionary

Albanian Dictionary for the spellcheck function in Mozilla products.

Rated 5 out of 5 stars (14)
110 users

Luxembourgish Dictionary (Spellchecker.lu)

Luxembourgish (lb-LU) spellchecking dictionary

Rated 5 out of 5 stars (8)
363 users

Armenian spell checker dictionary

Armenian spell checker dictionary

Rated 4 out of 5 stars (7)
88 users

Nepali Dictionary

Nepali SpellChecking dictionary (based on dictionary compiled by Madan Puraskar Pustakalaya)

Rated 4 out of 5 stars (14)
8 users

Объединённый словарь русской орфографии

Словарь для проверки орфографии содержащий 450+ тысяч русских и 95+ тысяч английских слов.

Rated 4 out of 5 stars (11)
88 users

Corrector ortografico aragonés

Diccionario ortografico ta programas que faigan servir o corrector Hunspell: LibreOffice, OpenOffice, Firefox, Thunderbird
Aragonese spelling dictionary for software using the Hunspell spellchecker: LibreOffice, OpenOffice, Firefox, Thunderbird

Rated 5 out of 5 stars (1)
82 users

Litreoir GaelSpell do Mhozilla

Litreoir saor in aisce don Ghaeilge, cruthaithe ag Kevin Scannell...

Rated 5 out of 5 stars (8)
116 users

Gujarati Spell Checker (India)

Gujarati Spell Checker

Rated 4 out of 5 stars (1)
24 users

Belarusian Dictionary

Belarusian spell dictionary

Rated 5 out of 5 stars (15)
88 users