Most Popular Extensions
Sort by:
QuickFolders (Tabbed Folders)
The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.
See new mail at a glance after automatic filtering - supports quickFilters addon!
DOM Inspector Requires Restart
DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.
FiltaQuilla
Adds many new mail filter actions - launch a file, suppress notification, remove star or tag, mark replied or unread, copy as "read", append text to subject.
FileLink Provider for Box
Uploads your large attachments to your Box instead of sending them by email.
Shrunked Image Resizer
Make your photos smaller, so they don't take forever to email.
*Shrunked Image Resizer is no longer maintained.*
quickFilters
Quickly generate mail filters on the fly, by dragging and dropping mails and analyzing their attributes. Create a filter in less than 10 seconds, it's as easy as: drag, click, click.
By popular demand, supports SORTING filters alphabetically.
LocalFolders
Add as many local folders as you want to.
New folders can reside on mapped or network locations.
New 102 version released !
Display Mail User Agent T Featured
Displays the mail program with which the selected mail was written
*This addon is compatible with Thunderbird after Web Extesnsions support. Since development and operation check are done on Daily, it may not work on normal Thunderbird.
uBlock Origin
Finally, an efficient blocker. Easy on CPU and memory. uBlock Origin (uBO) is a CPU and memory-efficient wide-spectrum content blocker that blocks ads, trackers, coin miners, popups, annoying anti-blockers, etc. in your feeds.
Allow HTML Temp
Allows to have HTML temporarily enabled (and displayed) in the currently selected message by only one click. When switching to another message, it'll be shown automatically again in plain text or simple html mode (according to your settings).
MyPhoneExplorer
This Addon is needed to sync your Android based smartphone with Thunderbird with the Software "MyPhoneExplorer". You can get MyPhoneExplorer from: https://www.fjsoft.at
Dark Reader
Dark mode for every email. Take care of your eyes, use dark theme for night and daily messaging.
Auto Address Cleaner T
Remove comment, display name from addresses before sending mail.
This add-on is a fork of Auto Address Cleaner.
https://addons.thunderbird.net/thunderbird/addon/auto-address-cleaner/
ImportExportTools Requires Restart
Adds some tools to import and export folders and messages
Simple Startup Minimizer
This extension will minimize Thunderbird on startup, it is very simple and I didn't put much work into it but it should work on all platforms. Please let me know if you want more features added into it.
Google-4-TbSync
This provider add-on adds Google synchronization capabilities to TbSync. Only contacts and contact groups are currently managed, using Google's People API.
Please read the "About this Add-on" section below carefully!
To create your own collections, you must have a Mozilla Add-ons account.