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.
Use the Evernote Web Clipper to save things you see on the web into your Evernote account.
Allows bidirectional access to Google Calendar
Synchronizes contacts & groups between Thunderbird or SeaMonkey and Google Contacts. Imports Facebook friends, contacts you follow on Twitter, and more.
Switch the signature on/off or choose a new one from your predefined set...
This extension is for those TB3 users who want the multiple-columns view that TB2 allowed
Adds toolbar buttons to the customize toolbar window in several programs including Firefox, Thunderbird and SeaMonkey. Some of the buttons make commonly preformed actions quicker, others add new functionality.
Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.
Scrolls the page smoothly when scrolling the mouse wheel (or keyboard arrows if enabled).
Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).
Displays the address books in a sidebar in Thunderbirds 3-pane-window and can be toggled with the F4 key or a toolbar button.
Visit my Contacts Sidebar site for recent versions and news.
Extension to mimic Outlook Express Stationery.
Allow you to use HTML files as templates for mail. Also allow custom template in replies or forwarded mail!
The "Swiss army knife" of folders. Turn your favorites into tabs - open folders and subfolders, move mails without scrolling around or searching. powerful + easy.
See new mail at a glance after automatic filtering - supports quickFilters addon!