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.
Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers
Facilitates handling of duplicates in your address book(s). Allow to search and remove similar contacts.
Thunderbird Message Filter Import/Export is a thunderbird/mozilla extension to import/export message filters.
Minimizes Mozilla windows into the system tray. Also includes a right clickable tray icon menu to further load only the windows you want visible...
Add Inline / As Attachment option to Forward button and Message context menu.