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).
Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.
Adds some tools to import and export folders and messages
OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.
Switch the signature on/off or choose a new one from your predefined set...
This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.
The latest version is compatible with Thunderbird 38+ only (see below for details).
True "Send Later" functionality to schedule the time for sending an email.
A system tray extension for Linux and Windows, allowing to set up custom icon, hiding to tray instead of closing, display the number of unread messages in mailing applications, and other features ...
Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers