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StartupMaster No Restart

Asks for the master password at startup (fixes multiple password prompt)

Rated 4 out of 5 stars (222)
18,693 users

Clean Subject

"Clean Subject" cleans the subject from multiple occurrences of subject prefixes such as ("Re: Re-2: Re:") and postfixes that are inserted by other clients. Words like "[SPAM]" can be cleaned as well. These prefixes can be defined in the preferences.

Rated 4 out of 5 stars (38)
3,595 users

Is It Compatible?

**Notice: This addon is no longer maintained.** Are your addons compatible with the next version of Firefox? Find out straight from the Addons window! **Version 0.6.0 is available from the Versions page, it was never approved by AMO**

Rated 4 out of 5 stars (40)
1,805 users

Message Notes Plus

Message Notes Plus allows to add notes to emails. The notes don't affect the email in any way.
They are stored locally on your hard drive.

The commercial version of the add-on allows to share notes with other users: http://msgnotes.alehro00.com

Rated 4 out of 5 stars (27)
4,449 users

Automatic Dictionary No Restart

Remembers the language you use with a person or group of people, and switches the spellchecker language automatically for you next time. You do not have to do it manually any more. It remembers and switches it for you.

Rated 5 out of 5 stars (22)
2,840 users

Expression Search / GMailUI

Powerful message searching through expressions. Type "from:fred to:tom" to see all messages from Fred to Tom in the current view. Support 'regular expressions' and 'click to search'.

Rated 4 out of 5 stars (75)
7,949 users

Thunderbird Chat Notification

Chat notification for Mozilla Thunderbird. Notification with alert (click on alert open conversation) and sound.

Rated 4 out of 5 stars (5)
2,643 users

OutlookAlike BETA

Makes Thunderbird looking like Outlook.

Rated 4 out of 5 stars (29)
4,137 users

ThunderPEC

ThunderPEC semplifica la gestione della Posta Elettronica Certificata (PEC) e delle comunicazioni PCT e FatturaPA in Thunderbird.

Rated 5 out of 5 stars (12)
15,611 users

Toggle Headers

Allows to switch between the normal header view and viewing all headers when viewing a message by using a keyboard shortcut (H).

Rated 4 out of 5 stars (6)
1,373 users

G-Hub Lite

Add Google Tabs to Thunderbird! Services supported: Voice, Calendar, Drive, Docs, Sheets, Slides, Hangouts, Plus, Photos, Contacts, News, Maps, & many more. Need Google Apps? Check out G-Hub Pro: http://www.schiffner.com/index.php/software/g-hub-pro

Rated 4 out of 5 stars (3)
3,465 users

SQLite Manager

Manage any SQLite database on your computer.

Rated 5 out of 5 stars (52)
186,221 users

Mass Password Reset

Sometimes you change a central password that ends up changing 12 others. This add on helps you reset multiple passwords in the Firefox/Thunderbird password manager.

Rated 5 out of 5 stars (26)
1,555 users

Mark All Read Button

Adds toolbar buttons to Mark All emails as Read, Mark Thread as Read, and Goto Next Unread Thread.

Rated 4 out of 5 stars (30)
4,275 users

QuickPasswords

Retrieve your Passwords the quick way! Never retype or display your secure passwords on screen anymore - put the password where you need it - the login form or the clipboard.

Now also includes SSO change (multi-domain pw) and Backup + Restore.

Rated 5 out of 5 stars (48)
6,008 users

Console²

Console² (pronounced Console Squared or Console Two) replaces the JavaScript Console with what could be the next generation Error Console. From v0.5 includes the Console Filter extension previously available separately from the Console² website.

Rated 5 out of 5 stars (49)
7,179 users

InfoLister

Lists installed add-ons (extensions, themes, plugins). Compatible version linked from the Developer comments section at the bottom of the addon's page.

Rated 4 out of 5 stars (30)
1,069 users

Emoji Menu

Adds the ability to easily insert emojis into your composed messages in Thunderbird.

Rated 4 out of 5 stars (6)
3,325 users

AutoCopy

Select text and it's automatically copied to the clipboard. Also pastes on middle click.

Rated 4 out of 5 stars (523)
15,580 users

Mail Summaries

Adds a summary of mail accounts and folders to replace the account central pane and the empty folder preview

Rated 5 out of 5 stars (40)
5,403 users