Most Popular Extensions
Display helpful, informative cursors for scrollbars.
Attachment Manager Requires Restart
An extension to manage attachments across multiple emails.
Lowercase Email Addresses in Message Headers Requires Restart
Shows lowercase email addresses in message headers and their tooltips.
SendToSecondEmail Requires Restart
This Extension lets you send Mails to both, first and second email address...
Mail Sent Notifier Requires Restart
Allows to notify a HTTP-GET based webservice after successfully sent an email, e.g. for time registration systems.
Hütte Nippon for Thunderbird Requires Restart
Display weather report for a week of Japan.
Identity Checker Requires Restart
This add-on checks to sender identity when send a message.
Received Requires Restart
Displays the "Received" header parsed with a regular expression.
Changes the mask character used in password fields.
Ethical signature Requires Restart
Add a button to the email composition toolbar, which lets you insert an ethical signature.
Re: Sort Requires Restart
View Headers Toggle Button Requires Restart
This extension adds a toolbar button that allows the easy toggling of viewing all message headers.
Kmaleon Extension Requires Restart
Con esta extensión podrás hacer una copia de tus emails en el programa kmaleon.
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!!!
SmartSave Thunderbird Extension Requires Restart
Now you can export your messages in a smarter way! You can export all folders and subfolder esaily from your local folder or from your IMAP...
Follow Broken Lotus Notes Links Requires Restart
Fixes the HREF on MASFLOW links in emails from Lotus Notes.
If you dont know what that is you do not need this.
Compose for Thunderbird Requires Restart
THIS ADDON IS UNMAINTAINED, SEE BELOW.
Compose messages the new hip way! Allows you to compose in a tab with a new editor and an improved autocomplete.
Gnome Open Requires Restart
Open your mail attachments directly with your default gnome application.
ONLY for GNOME USERS!
Is Gnome Open still needed? Please read "Developer Comments" below.
Channel Guard Requires Restart
Channelguard disables plugins and protocol handlers to ensure maximum security against side-channel attack.
Posting Style Enforcer Requires Restart
Automatically converts top-posted messages to use bottom-positng or vice versa. Interleaved posts are left alone. Detects automatically added text and supports a per-contact list of exceptions.