Thunderbird Add-ons
- abcTajpu
- Copy Sent to Current
- FolderFlags
- Folderpane Tools
- GMailUI
- Lightning
- Provider for Google Calendar
- Mail Redirect
- New Mail Icon
- Nostalgy
- Quicktext
- Signature Switch
- ThunderBrowse
- View Headers Toggle Button
- Xnote
- MailClassifier
More add-ons can be found at [1]