F22: what's wrong with system tray?

[Temlakos]

System tray limits itself to volume control, Klipper, the IM app (which 
I do not use), the connection icon, and a caret to look for hidden 
icons. Those are: notification, battery, Bluetooth, device notifier, 
printers, and software updates.

On F21, the Mozilla Firetray icons used to load on the system tray. Now, 
if Thunderbird tries to minimize to the tray, it disappears completely. 
Firefox won't start at all; it keeps crashing. (I've already filed a bug 
against it.) I have other applications, including Skype and Deluge, that 
used to have system tray icons, but I can't see them any more. I also 
have an ancient password manager program (pwmanager-1.2.4-fc11) that 
used to load into the system tray and now I can't see it, though 
ksysguard assures me it's running.

How do I get the system tray to work as I'm used to? Or if I can't, what 
am I supposed to do instead?

Temlakos