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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.
Српски речник - Serbian Dictionary
Српски правописни речник - Serbian (Cyrillic and Latin) spellcheck dictionary
Toggle Headers
Allows to switch between the normal header view and viewing all headers when viewing a message by using a keyboard shortcut (Ctrl+H).
Expertspam
Received
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.
filemail
Move mails to the same folder where previously mails have been moved from this author by hitting a single key
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.
Finnish Spellchecker
Finnish (fi-FI) spellchecker dictionary for Firefox, Thunderbird and SeaMonkey .
Mail Sent Notifier
Allows to notify a HTTP-GET based webservice after successfully sent an email, e.g. for time registration systems.
Esperanta Vortaro
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.
Russian spellcheck dictionary (yo). Based on AOT.
Russian spellchecker dictionary. Based on works of AOT.ru group. (only yo)
Nepali Dictionary
Nepali SpellChecking dictionary (based on dictionary compiled by Madan Puraskar Pustakalaya)
Armenian spell checker dictionary
Объединённый словарь русской орфографии
Словарь для проверки орфографии содержащий 450+ тысяч русских и 95+ тысяч английских слов.
To create your own collections, you must have a Mozilla Add-ons account.
