Welcome to Thunderbird Add-ons.
Add extra features and styles to make Thunderbird your own.Close
Most Popular Extensions
NewTongWenTang is a tool to switch display Chinese content between traditional and simplified glyphs (中文繁簡體互轉工具)
Classic Toolbar Buttons No Restart
'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions on Windows.
Beta builds on versions page!
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.
Disable Add-on Compatibility Checks No Restart
Reinstates the extensions.checkCompatibility preference without respect to the current application version.
Allows for customization of the folder pane. Accounts can be rearranged and the startup folder can be chosen.
Useful tools for the nightly tester.
Clean Links No Restart
Copies text without formatting
Extension to mimic Outlook Express Stationery.
Allow you to use HTML files as templates for mail. Also allow custom template in replies or forwarded mail!
Displays icon for user agent of received mails.
Extracts all attachments from selected messages and then can delete, detach or mark-read.
Contacts Sidebar Featured
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.
Save frequently-entered text for pasting later.
FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.
Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)
Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers
Mail Redirect Featured
Allow to redirect (a.k.a. "bounce") mail messages to other recipients.
Allows you to resize the window to specific dimensions.
NOTE: Users of Firefox 29 and above must install "The Addon Bar" extension to use this, as Firesizer uses the add-on bar that has been removed in Firefox 29.