Icon of Thunderbird Biff

Thunderbird Biff Requires Restart

by David White

This add-on provides a visual indicator of new Thunderbird mail availability in supported clients (Firefox, Sunbird) and Thunderbird itself. Note: you MUST install this add-on in BOTH Thunderbird and supported clients as there are both client AND server portions which communicate via a TCP/IP socket.

This add-on has been marked as experimental by its developers