User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101
Firefox/58.0
Build Identifier: 

Programs such as QEMU/virt-manager, SMTube (not SMPlayer) and Minitube raise
the volume to very high levels, but only when they emit sound for the first
time after being opened. I'm not sure what causes this.

Reproducible: Always

Steps to Reproduce:
1. Start one of the programs above
2. Play any sound in one of the programs above
Actual Results:  
System volume is raise from my usual 35% to 60-100%

Expected Results:  
System volume should stay at the value I set and the sounds should play at that
volume.

I'm using KDE Plasma 5.12