Hello everyone! I am running UM 15.10 (fresh install). I use Thunderbird as my default email client. Additionally, I use firetray plugin so that It is starting right away after my laptop boots and to keep running in the background. I have two email accounts. The problem is that Thunderbird doesn’t show any notifications, except for a sound, if an email is received. Does anyone have an idea of what is going wrong? Maybe a wrong setting, or is it a bug?
Thank you in advance 
It might be a bug with the plugin - I experienced similar conflicting behaviour when the “Start minimized” plug-in stopped working and don’t recall seeing any notifications, just the fact the icon turned blue, so I removed it.
If my memory serves me right, I think there was increased CPU and fluctuating memory usage when idle caused by the plugin – pity, because it was nice to see the tray icon again. 