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
Allows bidirectional access to Google Calendar
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
True "Send Later" functionality to schedule the time for sending an email.
A remake of the MinimizeToTray-extension made to fit the Windows 7 taskbar. Instead of minimize the window to the tray it minimize it to the taskbar. It can minimize on startup, when the window is closed and/or when the esc key is pressed.
Extracts all attachments from selected messages and then can delete, detach or mark-read.
Allows for customization of the folder pane. Accounts can be rearranged and the startup folder can be chosen.
Displays icon for user agent of received mails.
Toolbar-Buttons for Lightning; advances the feature to get rid of the tabbar.
Adds blink feature to the new-mail alert.
You can also disable auto-hiding of the alert.
Note from Mozilla: This add-on has been discontinued. Try MinimizeToTray Revived instead.
Minimize applications to the system tray.
It adds a button that can be put in toolbars and that open the addressbook in a new tab