Most Popular Extensions
Last Message Requires Restart
Navigate the folder to the last message in the moment the folder is opened.
Color Source Requires Restart
Add syntax highlighting of code in various languages to email messages via context menu.
rmIncomingDups Requires Restart
rmIncomingDups is a Thunderbird extension that checks if there are duplicate messages across accounts.
When a new mail arrives rmIncomingDups checks according to the rules configured if it finds some duplicates and removes them.
RSS Editor Requires Restart
Desktop RSS editor for casual editing of RSS 2.0...
gTimer Requires Restart
gTimer предназначен для подсчёта времени, проводимого за работой в Firefox.
nowebsearch Requires Restart
Removes web search feature
Close Tab By Double Click Requires Restart
Close active tab by double-clicking it.
BccInfo Requires Restart
Send any additional information to your BCC recipient.
AWN Unread Count Requires Restart
Displays the number of unread messages in the Thunderbird AWN dock icon.
Filter SubFolders Requires Restart
Applies mail filters to sub folders of an IMAP account, not just the Inbox
SMS Sidebar Requires Restart
If you work in front of a computer and send a lot of SMS text messages this is for you. Finally you can send SMS from the privacy of your Mozilla application. The focus of this addon is on efficiency, ease of use and easy access to advanced SMS featu...
Options Toolbar Button Requires Restart
Easy Get Mail Button Requires Restart
Makes the 'Get new messages' button context-sensitive. Select an account root folder to get messages for that account, any other folder to get messages for all...
Identity Checker Requires Restart
This add-on checks to sender identity when send a message.
EuropeanMX Spam Reporter Requires Restart
Train your EuropeanMX filter by reporting unrecognized spam or false-positives back to us.
Ethical signature Requires Restart
Add a button to the email composition toolbar, which lets you insert an ethical signature.
Cat Attack Quick Button Requires Restart
Easily visit the site for The Cat Attack Fishing Tournament.
arXiv Requires Restart
Adds direct links to the article PDF and BibTeX information to arXiv email listings. BibTeX information can be used in reference managers such as JabRef by Copy & Paste.
SendToSecondEmail Requires Restart
This Extension lets you send Mails to both, first and second email address...
Indian Language Transliterator Requires Restart
Indian Language Transliterator (developed at IIIT Hyderabad, India) is a Mozilla Thunderbird Add-on, developed to enable Thunderbird users to compose and send messages in 10 Regional Indian Languages, using their regular QWERTY keyboard!!!