This addon needs an external application to work. You can get it here:
Download the SysTray-X Companion application here

### Windows

Minimize action
Default minimize
Minimize to tray, method 1
Minimize to tray, method 2

Close action
Default close
Minimize main, close children
Minimize all windows

Start application minimized

### Icon

Default icon
Default Thunderbird
Lookthrough icon
Custom icon |  | Browse... |

KDE integration (Hide)

Unread mail icon
Blank icon
New mail icon
Custom icon |  | Browse... |
No icon

Number
Display unread message count
Number color:
Number size:

Message count type: Unread New

### Accounts

### Debug options

Display debug window
Save preferences