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Auto-Mark Folder Read

New messages can be automatically marked as read in common folders (e.g. spam, trash, drafts, templates).

For TB up to 121, please use the most recent v1.5.* add-on release.

For TB as of 122, just use the latest add-on version (1.6 or higher).

Rated 4 out of 5 stars (11)
727 users

Old (classic) Icons

This replaces the new monochrome icons with the old/classic colorful icons. Uses the code from Phoenity Icons and the graphics from older Thunderbird versions.

Rated 5 out of 5 stars (33)
2,642 users

MyPhoneExplorer

This Addon is needed to sync your Android based smartphone with Thunderbird with the Software "MyPhoneExplorer". You can get MyPhoneExplorer from: https://www.fjsoft.at

Rated 4 out of 5 stars (18)
9,704 users

Weatherlicious

A dynamic theme based on weather data from OpenWeatherMap.

Rated 4 out of 5 stars (9)
325 users

Outlook Address Book Enabler

Enables the Outlook address book in Thunderbird.

Rated 4 out of 5 stars (1)
1,202 users

Check Domain NG Requires Restart

This is a fork of "Check Domain" addon, which can run on 68 version of Thunderbird.

Rated 3 out of 5 stars (2)
1 user

Open In Conversation Requires Restart

Make the default message list action be "Open Message in Conversation" when double-clicking or using the "Enter" key to open an email from the message list.

Rated 5 out of 5 stars (3)
25 users

Mail Merge P

Mail Merge P (Mail Merge with Preview) is a Thunderbird add-on to send bulk emails based on data provided in a spreadsheet. It uses the nunjucks templating engine.

Rated 3 out of 5 stars (19)
2,141 users

RemindMe

Moves email into Inbox/RemindMe folder, and moves it back into Inbox after chosen time.

Rated 5 out of 5 stars (5)
406 users

acus

Update 2023: This addon will be replaced by "arcus".

Modern encryption in Thunderbird

** Currently in testing phase **
What you can do:
1. Set your secret key and automatically decrypt emails
2. Generate a new key pair
3. Encrypt plain text

Not yet rated
3 users

Australian English Dictionary

FEATURES
- Profanity
- Racism
- Slang words
and so much more!

GitHub repo @ https://github.com/Caskexe/Australian-English-Dictionary
Firefox Add-ons listing @ https://addons.mozilla.org/en-GB/firefox/addon/australian-english-dictionary/

Rated 5 out of 5 stars (2)
1,934 users

InfoCodex DocSummarizer

Intelligent document and mail summarization tool based on the artificial intelligence of InfoCodex. Create better summaries chapter-by-chapter and tag them in your preferred language.

Rated 1 out of 5 stars (1)
11 users

New UNEC

New UNEC is a browser extension that transforms the UNEC student panel into a modern and user-friendly interface. It dynamically replaces the existing webpage’s HTML, CSS, and JS with an improved design, featuring automatic dark mode, language.

Not yet rated
17 users

Clear History Button

Adds a button to launch the Clear History dialog

Rated 5 out of 5 stars (1)
77 users

ThunderWebTabs

Opens Google Keep, Google Photos, Android Messages or any other website in Thunderbird's tab.

Users who encounter "Browser not supported errors" should try changing their User Agent. For more details, please visit the "Support site".

Rated 5 out of 5 stars (3)
323 users

Change Link Appearance

Changes the appearance of links when displaying a message

Not yet rated
107 users

Last selected message

The add-on remembers the last selected message in visited folders. After restarting Thunderbird, when we enter the previously visited folder, this message will be displayed, just like in Microsoft Outlook.

Rated 3 out of 5 stars (5)
195 users

Filtered Folder to Favorite

Add filtered folders to favorites. You may lose your favorites. For those with many folders.

Rated 1 out of 5 stars (1)
2 users

Microsoft To Do - Quick Access

Quick Access to Microsoft To Do (Live) in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.

Rated 5 out of 5 stars (1)
523 users

Open Google Tabs

Open up Google Calendar, Notes, and Microsoft Outlook in a new tab.

Not yet rated
111 users