Up & Coming Extensions

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Join-NG Requires Restart

Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".

Rated 5 out of 5 stars (4)
2,489 users

Address Close Button Requires Restart

Adds a Address Close Button to mail compose window.

Rated 5 out of 5 stars (26)
2,220 users

Provider for CalDAV & CardDAV Requires Restart

This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync".

Rated 5 out of 5 stars (14)
13,507 users

Hide Local Folders Requires Restart

Removes the "Local Folders" entry from the folder pane.

Rated 4 out of 5 stars (31)
8,223 users

LocalFolders Requires Restart Featured

Add as many local folders as you want to.
New folders can reside on mapped or network locations.

Works with both TB60 through TB68

Rated 4 out of 5 stars (19)
10,042 users

ThunderHTMLedit Requires Restart Featured

Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.

Rated 5 out of 5 stars (17)
6,951 users

Quicktext Requires Restart

Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.

Rated 4 out of 5 stars (348)
100,767 users

AddressBookTab Requires Restart

It adds a button that can be put in toolbars and that open the addressbook in a new tab

Rated 4 out of 5 stars (65)
1,394 users

Send Later Button Requires Restart Featured

A simple button to invoke the (already existing) send later functions.

Rated 4 out of 5 stars (3)
9,102 users

DKIM Verifier Requires Restart

Verifies the DKIM-Signature of an e-mail.

Rated 4 out of 5 stars (22)
10,583 users

Secure Addressing Requires Restart

This add-on provides features to avoid sending emails to wrong addresses. Key features are a confirmation window of recipient's addresses upon sending, name and affiliation look up at mail composition and main windows, and safe auto completion.

Rated 4 out of 5 stars (30)
3,371 users

Remove Duplicate Messages (Alternate) Requires Restart

Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).

Rated 4 out of 5 stars (203)
76,743 users

Addressbooks Synchronizer Requires Restart

Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers

Rated 4 out of 5 stars (62)
33,830 users

QuoteCollapse Requires Restart

Collapse and expand quotes.

Contributors: Stanimir Stamenkov, Dillinger

Rated 4 out of 5 stars (27)
4,517 users

Menu On Top (SuperMenu Avatar) Requires Restart

Move the Thunderbird menu bar to the top. Choose from a selection of visual styles + colors. Add frequently used bookmarks and an avatar icon without wasting precious screen space. Bookmark your favorite sites, emails, folders or configuration pages.

Rated 5 out of 5 stars (8)
1,439 users

Custom Address Sidebar Requires Restart

Allow you to help address sidebar more useful.

Rated 5 out of 5 stars (18)
4,128 users

TbSync Requires Restart Featured

TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.

Rated 5 out of 5 stars (72)
27,252 users

Contacts Sidebar Requires Restart

Displays the address books in a sidebar in Thunderbirds 3-pane-window and can be toggled with the F4 key or a toolbar button.

Visit my Contacts Sidebar site for recent versions and news.

Rated 4 out of 5 stars (243)
2,038 users

Shrunked Image Resizer Requires Restart

Make your photos smaller, so they don't take forever to email.

Rated 4 out of 5 stars (44)
7,287 users

Folderpane Tools Requires Restart

Allows for customization of the folder pane. Accounts can be rearranged and the startup folder can be chosen.

Rated 3 out of 5 stars (124)
2,048 users