Up & Coming Extensions
Join-NG Requires Restart
Join partial messages. Somewhat similar to MS Outlook Express "combine and decode".
Address Close Button Requires Restart
Adds a Address Close Button to mail compose window.
Provider for CalDAV & CardDAV Requires Restart
This extension adds support for CalDAV & CardDAV accounts to the Thunderbird Sync manager "TbSync".
Hide Local Folders Requires Restart
Removes the "Local Folders" entry from the folder pane.
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
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.
Quicktext Requires Restart
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
AddressBookTab Requires Restart
It adds a button that can be put in toolbars and that open the addressbook in a new tab
Send Later Button Requires Restart Featured
A simple button to invoke the (already existing) send later functions.
DKIM Verifier Requires Restart
Verifies the DKIM-Signature of an e-mail.
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.
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).
Addressbooks Synchronizer Requires Restart
Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers
QuoteCollapse Requires Restart
Collapse and expand quotes.
Contributors: Stanimir Stamenkov, Dillinger
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.
Custom Address Sidebar Requires Restart
Allow you to help address sidebar more useful.
TbSync Requires Restart Featured
TbSync is a central user interface to manage cloud accounts and synchronize their contact, task and calendar information with Thunderbird.
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.
Shrunked Image Resizer Requires Restart
Make your photos smaller, so they don't take forever to email.
Folderpane Tools Requires Restart
Allows for customization of the folder pane. Accounts can be rearranged and the startup folder can be chosen.