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List Unsubscribe
Adds a button to unsubscribe from newsletters and other bulk email that has the List-Unsubscribe header.
Messenger - Quick Access
Quick Access to Facebook Messenger in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
NTFNTF
NTFNTF: Notify on This Folder Not That Folder. Choose to enable or disable notifications on a per-folder basis.
Thunderbird Email 2 CSV Exporter
This add-on has been thoroughly tested on all platforms up to Thunderbird version 115. It allows you to target specific file folders and tag them for export, generating a CSV-formatted export file. Great for a large number of emails and Mailchimp.
OnMail - Quick Access
Quick Access to OnMail in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
Date Time Formatter
Shows relative date-time in the column.
Note: you need to click "Select columns to display" and then -> "Relative Date/Time"
Deselector
Junk Mail ByeBye
This extension identifies and protects you from spam emails, phishing emails, and other unwanted messages. It is primarily targeted towards filtering out spam in Japanese.
Mailfence - Quick Access
Quick Access to Mailfence in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
Microsoft Teams - Quick Access
Quick Access to Microsoft Teams in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
Khmer Spellchecker
Uzbek spell checker
Dictionnaire orthographique kikongo
Correcteur orthographique en kituba de RDC, kikongo ya leta
Simpler English Dictionary
Haitian Creole spell checker
Korektè Òtograf Kreyòl (KÒK) se yon korektè òtograf otomatik gratis nan lang Kreyòl Ayisyen ki develope avèk èd LOGIPAM ak Kevin Scannell
Korektè Òtograf Kreyòl (KÒK) is a free Haitian Creole Spell Checker developed by LOGIPAM and Kevin Scannell
Hide Email Folders
Hide Email Folders from the Folder pane (Left pane).
Note: This addon only works for Unified pane/folder mode.
Note #2: Please note that this addon only hide email folders and NOT local folders!
Special thanks to John Bieling, C-E and Alex Cabal.
FileLink Provider for Dropbox
Uploads your large attachments to your Dropbox instead of sending them by email. This uses Thunderbird's FileLink feature.
Azerbaijani Spellchecker
Azerbaijani SpellChecker for Mozilla Firefox. Developed with love by Mozilla Azerbaijan.
Darko
Deselect on Delete TB78
Disables selection of the next message when deleting.
A quick port of squib's "Deselect on Delete" for thundebird 78.
To create your own collections, you must have a Mozilla Add-ons account.
