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Český slovník pro kontrolu pravopisu
Slovník pro kontrolu pravopisu pro aplikace Mozilla
Deutsches Wörterbuch, erweitert für Österreich
Deutsches Wörterbuch (neue Rechtschreibung), erweitert mit österreichischen Wörtern, für die Rechtschreibprüfung in Mozilla-Produkten
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.
Deutsches Wörterbuch (Schweiz)
Wörterbuch mit Schweizer Varianten der deutschen Schreibungen für die Rechtschreibprüfung in Mozilla-Produkten
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.
Svenska Fria Ordlistan
Ett verktyg för stavningskontroll. Ordlistan har utvecklats ideellt utan stöd från de språkvårdande institutionerna. Använd den på egen risk.
Dansk ordbog til stavekontrollen
Dansk ordbog til stavekontrollen i mails, forums, blogs osv. til Firefox, Thunderbird og andre Mozilla-programmer.
English - Greek Spelling dictionary
Ελληνικό-Αγγλικό ορθογραφικό λεξικό για ευκολότερο ορθογραφικό έλεγχο σε δίγλωσσα κείμενα για Firefox - Thunderbird και Seamonkey
AutoarchiveReloaded
Featured
Archiviert E-Mails automatisch (Verbesserte Version vom "Autoarchive" Add-on)
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.
FlexConfirmMail Stable
Confirm mail address and attachments based on flexible rules.
This is enterprise edition with less updates. Another edition for regular users:
https://addons.thunderbird.net/thunderbird/addon/flex-confirm-mail/
Arabic spell-checking dictionary
Arabic spell-checking dictionary for Firefox 3 and Thunderbird 3 from Ayaspell.
United States English Spellchecker
This dictionary is no longer maintained. Use this dictionary instead.
Grammalecte [fr] (for Thunderbird)
Correcteur grammatical dédié à la langue française. Inclus : conjugueur, formateur de texte et dictionnaires orthographiques.
Allow HTML Temp
Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).
Brazilian Portuguese Dictionary (Former Spelling)
The same spellchecker shipped with the Brazilian version of Firefox, just using the former spelling (which is valid until January 1st 2016).
G-Hub Lite
Google Tabs for Thunderbird! G-Hub Lite supports Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need Google Workspace support (formerly G Suite)? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro
CategoryManager
Category manager for Thunderbird contacts, also allows to send an email to all members of a category (categories can be used as contact groups).
To create your own collections, you must have a Mozilla Add-ons account.
