Up & Coming Extensions
Auto Address Cleaner Requires Restart
Removes comment, display name automatically from addresses before sending mail.
Provider for Google Calendar Requires Restart
Allows bidirectional access to Google Calendar
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
Lightning Requires Restart
Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.
Add Google Tabs to Thunderbird! Services supported by G-Hub Lite: Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need G Suite / Google Apps support? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro
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.
Addressbooks Synchronizer Requires Restart
Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers
ReminderFox Requires Restart
ReminderFox displays and manages lists of reminders and tasks. ReminderFox uses easy-to-use lists with warnings/alarms to remind you of all your important appointments.
Synchronize ReminderFox with other calendars as well.
Mail Redirect Requires Restart
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
Send Later Requires Restart Featured
True "Send Later" functionality to schedule the time for sending an email.
ThreadVis Requires Restart
Displays a small graphic visualising the context (thread) of the currently selected email.
Remove Duplicate Messages Requires Restart
If you have duplicate messages (e.g. from merging folders or downloading messages several times) you can use this tool to find and remove them from the selected folder and its subfolder by rightclicking on a folder and choosing "Remove duplicates..."
Folder Pane View Switcher Requires Restart
Folder view arrows; switch to "All Folders" view when hovering during drag & drop; allow user to select which views are enabled or tied to the view arrows.
Minimize On Start and Close Requires Restart
A remake of the MinimizeToTray-extension made to fit the Windows 7 taskbar. Instead of minimize the window to the tray it minimize it to the taskbar. It can minimize on startup, when the window is closed and/or when the esc key is pressed.
Custom Address Sidebar Requires Restart
Allow you to help address sidebar more useful.
Thunderbird Message Filter Import/Export Enhanced Requires Restart
Thunderbird Message Filter Import/Export Enhanced is a compatibility port of Wind Li's add on.
Original add on here: https://addons.mozilla.org/en-US/thunderbird/addon/thunderbird-message-filter-imp/
Address Move Button Requires Restart
Allow you to add a Address Move Button to mail compose window.
Simple Locale Switcher Requires Restart
An easier management of the user interface language
Folderpane Tools Requires Restart
Allows for customization of the folder pane. Accounts can be rearranged and the startup folder can be chosen.
IMAP Quota (Free Space) Requires Restart
This Thunderbird addon lets you customize the IMAP quota statusbar panel.