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Copy Email Folder
This extension allows you to automatically copy email messages from one folder to another with all subfolders and perform a merge of the contents. It is a helpful tool for users who want to back up or sync folders but avoid duplicating emails.
Run Filters from Context Menu
Adds context menu options to run all filters on the selected folder or set of messages.
Maldives Dhivehi Spellchecker
N'ko
Nko spell-checker / Vérificateur orthographique N'ko sur la base du Corpus de référence N'ko http://cormand.huma-num.fr/cormani/ Un vérificateur est aussi disponible comme Extension de la suite Libre Office
Upper Sorbian spell checker
Uppersorbian dictionary for spellchecking in Mozilla products based on soblex version 2.10.22.
Disable DragAndDrop (New)
Disable drag and drop on the folder tree in order to prevent unintended folder movement.
ImportExportTools NG
Adds tools to import/export messages and folders
EML, MBOX, HTML PDF , Plaintext Support and CSV support with indexes and file naming.
SPAMBEE
Report any unsollicited email (SPAM, Phishing, ...) to SPAMBEE.
Get an alert if you open an email containing a URL already known as fraudulent.
All reports are anonymized, no registration is required.
Safe Links Cleaner
Clean up the display of links rewritten by Microsoft ATP Safe Links when reading and composing mail, so the original links can easily be viewed and copied, while retaining the rewritten addresses as the actual target of all links.
CloneMessage
When composing an email, CloneMessage allows you to duplicate the current state of the email.
OpenAttachmentByExtension
Dictionnaire occitan gascon
Corrector ortografic en occitan gascon entà Thunderbird.
Correcteur orthographique en occitan gascon pour Thunderbird.
TuLPe
Traffic light protocol extension for Thunderbird, messages are customizable in the option page.
Snakes by Bluemods
Classic Snakes game at your fingertips.
Snakes by Bluemods is a free-to-play single-player classics arcade game designed and developed by Justin Gates at Bluemods.com. The game allows the players to maneuver a snake made up of tiny squares.
To must occur only once
This add-on changes all but the first "to" to "cc" if there are multiple "to" when replying to an email.
Minimize on startup
Next Unread Thread (Mark All Read)
Adds a Thread button, marks current thread or conversation as read and moves to the next unread message
To create your own collections, you must have a Mozilla Add-ons account.
