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British English Dictionary (Marco Pinto)
A fork of Mark Tyndall's add-on, based on David Bartlett's
British Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey.
English United States Dictionary
English United States (en-US) Dictionary as shipped with Thunderbird 115 ESR and Firefox 115 ESR.
German Dictionary
German Dictionary (new Orthography) for spellchecking in Mozilla products
gContactSync
Requires Restart
Synchronizes contacts & groups between Thunderbird and Google Contacts.
Mail Redirect
Requires Restart
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
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.
Ukrainian dictionary
General Catalan dictionary
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.
German Dictionary, classical spelling standards
German Dictionary according to the classical spelling standards for spell-checking in Firefox and Thunderbird
Hungarian Dictionary
Český slovník pro kontrolu pravopisu
Slovník pro kontrolu pravopisu pro aplikace Mozilla
German Dictionary, extended for Austria
German dictionary (new Orthography) for spellchecking in Mozilla products, extended with Austrian words
German Dictionary (Switzerland)
Dictionary with Swiss variants of German words for spellchecking in Mozilla products
Danish Dictionary for the Spell Checker
Danish dictionary for Firefox, Thunderbird and other Mozilla products.
ReFwdFormatter
Remove the ">" prefix from quote when you make a reply.
[Source code] https://github.com/isshiki/ReFwdFormatter
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