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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.

Rated 4 out of 5 stars (10)
9,072 users

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.

Rated 5 out of 5 stars (2)
152 users

Auto Avatars

Add-on for Thunderbird that automatically populates contact photos with their Libravatar or Gravatar photo. Includes support for custom instances and federation!

Rated 4 out of 5 stars (1)
156 users

Identity Selector

Always select the right identity with Identity Selector!

Rated 4 out of 5 stars (2)
25 users

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.

Rated 5 out of 5 stars (1)
8,048 users

selectAll Button

This Add-on installs a button on the mail toolbar that will when clicked select all messages within the folder.

Not yet rated
129 users

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/

Rated 3 out of 5 stars (2)
1,368 users

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.

Rated 4 out of 5 stars (3)
229 users

Articles Toolbar

Adds the Articles toolbar

Not yet rated
18 users

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.

Rated 3 out of 5 stars (10)
5,217 users

Maldives Dhivehi Spellchecker Requires Restart

Dhivehi Spellchecker

Not yet rated
10 users

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

Rated 5 out of 5 stars (1)
0 users

Marshallese spell checker

Spellchecker for Marshallese.

Not yet rated
1 user

takikupu

A Māori spellchecker

Not yet rated
1 user

Upper Sorbian spell checker

Uppersorbian dictionary for spellchecking in Mozilla products based on soblex version 2.10.22.

Not yet rated
4 users

CloneMessage

When composing an email, CloneMessage allows you to duplicate the current state of the email.

Rated 5 out of 5 stars (1)
154 users

TuLPe

Traffic light protocol extension for Thunderbird, messages are customizable in the option page.

Not yet rated
18 users

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.

Not yet rated
26 users

InsertSignature

Insert signature helps you to insert usually used text by your customization.

Rated 4 out of 5 stars (14)
1,458 users