الإضافات

This extension will display the current status of your IMAP quota in thunderbird's statusbar and will warn you when you reach a configurable limit...

Access to Google contacts and synchronize them with Thunderbird address books.

Quote Colors allows you to select text and background colors of different quote levels which are applied when reading or printing mail/news messages. Additionally, you can choose between graphical and traditional plain text quoting display mode.

MailHops maps the route an email took to get to you. Displaying the senders location, weather, user-agent and authentication used.