This addon needs an external application to work. You can get it here:

Download the SysTray-X Companion application here



Windows

Minimize action



Close action



Start application minimized

Icon

Default icon
Default Thunderbird
Lookthrough icon
Custom icon  
KDE integration (Hide)
Unread mail icon
Blank icon
New mail icon
Custom icon  
No icon
Number
Display unread message count  
 

Accounts


Debug options


Display debug window