Minimizing Thunderbird to the system tray in Ubuntu

Some time ago I was writing about how you can minimize any application to the system tray in Ubuntu.

My main concern was minimizing the Thunderbird window to the system tray so I can have the mail reader running in the background.

Now I have just found a nice extension that do what I need.

FireTray is an extension for Firefox and Thunderbird that let you minimize both applications to the system tray, and still have them running in the background.

I have it running now in Ubuntu and it seems to work very fine!!