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Extract 'Em!
Featured
Extracts attachments from messages within an account or folder, with the option to select specific attachments. By default, extracted attachments are saved to a .zip file.
Articles Toolbar
Google Keep - Quick Access
Quick Access to Google Keep in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
Auto Avatars
Add-on for Thunderbird that automatically populates contact photos with their Libravatar or Gravatar photo. Includes support for custom instances and federation!
uBlock Origin
Finally, an efficient blocker. Easy on CPU and memory. uBlock Origin (uBO) is a CPU and memory-efficient wide-spectrum content blocker that blocks ads, trackers, coin miners, popups, annoying anti-blockers, etc. in your feeds.
Identity Selector
selectAll Button
This Add-on installs a button on the mail toolbar that will when clicked select all messages within the folder.
Send Later Button
The Send Later Button extension enhances Thunderbird by enabling 'Send Later' even in online mode. It supports many Languages, ensuring a seamless user experience.
See: https://github.com/That-Developer-Guy/Send-Later-Button-Thunderbird/
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.
English (US) Dictionary
This add-on repackages the en-US dictionary available in mozilla-central, which uses the normal (size 60) word list by SCOWL and integrates it with over 6 thousand words.
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.
Dictionnaire occitan gascon
Corrector ortografic en occitan gascon entà Thunderbird.
Correcteur orthographique en occitan gascon pour Thunderbird.
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.
Seams
Seams provides some integration with Patchwork, the patch tracking system. It makes the patch state visible directly from Thunderbird. It also displays useful links to a Patchwork instance or to mail archives, and commands to apply the patch locally.
To create your own collections, you must have a Mozilla Add-ons account.
