Recently Updated Extensions
Blend In Requires Restart
Blends in OS-related values in User-Agent HTTP request header & a number of JS properties, so that Firefox (Thunderbird) appears to sites visited as running on the OS being used the most in the world. Thunderbird can also be blended in as Firefox.
WarnAttachment Requires Restart
WarnAttachment shows an additional dialog to confirm potentially dangerous attachments. Some attachments like executables etc. are completely blocked. This reduces the risk of malware especially for inexperienced users.
Custom Address Sidebar Requires Restart
Allow you to help address sidebar more useful.
dwMailCopy Requires Restart
This add-on is help for create the mail division. This add-on is converting to "(2/5)" from the string "(1/5)" in E-mail subject, after copy the mail. After now, Will be freed from onerous copy-paste work.
Enigmail Requires Restart Featured
OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.
TORPEDO - TOoltip-poweRed Phishing Email DetectiOn Requires Restart
TORPEDO ist ein Tool zum Erkennen von betrügerischen Links (Phishing). Bewegen Sie die Maus über einen Link in einer Email. TORPEDO zeigt Ihnen die tatsächliche Webadresse in einem Tooltip an und hilft Ihnen, diese zu untersuchen.
Great DANE Requires Restart
Retrieve DANE S/MIME Certificates for Encryption/Signing.
This extension enables users to automatically retrieve S/MIME certificates using the Great DANE Engine (https://github.com/grierforensics/Great-DANE-Engine).
Mail Merge Requires Restart Featured
Mass Mail and Personal Mail
UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.
KeeFox Requires Restart
Simple and secure password management. Login automatically, never forget another password, stay in control of your passwords and improve their security. Powered by the world-renowned KeePass Password Safe.
Simple Locale Switcher Requires Restart
An easier management of the user interface language
Subject Manager Requires Restart
Manages subject of composed emails.
Add-on for Firefox and Thunderbird. Replaces built-in notifications with the OS native notifications. It supports most Linux Desktop Environments, Windows 8.1 & 10.
mms Auto Correct Requires Restart
AutoCorrect for the Compose window.
Adblock Plus Featured
Blocks annoying video ads on YouTube, Facebook ads, banners and much more.
Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
Get Selected Mails Requires Restart
Gets new messages for selected mail accounts.
S3.Google Translator Requires Restart
S3.Google Translator adds the power of Google Translate’s automatic translations to your browser!
It supports translation of selected text, entered phrase or whole webpage between any of 80+ languages.
New Feature: Language learning!
Personal Level Indicators Requires Restart
Shows an indicator so you can tell if an email was addressed only to you (»), a group (›), or a mailing list.
One-by-One Forward Requires Restart
Highlight multiple emails, right-click, then select "One-by-One Forward". This extension will allow you to forward the selected emails, one-by-one, to the recipients you specify using your choice of attachment handling.
MultiTemplateLoader Requires Restart
Manages & applies multiple HTML templates when creating/replying messages.
Templates may be either local files or online links (http:// or ftp://). Up to 9 templates can be defined and easily switched, also using shortcut keys.