I just freshly installed Manjaro
4.9.50-1-MANJARO with Gnome, and I'm having problems with the volume control, namely, when I play audio e.g. on Firefox and use the volume controls either on my keyboard, or in the system bar slider, the audio is unaffected and stays very loud.
I can only control it via getting into the sound settings, selecting the applications tab and controlling the particular application's volume slider.
How can I make the system volume control all applications' volume? All I've found googling so far was the exact oposite question - unlinking the system volume from application volume, but that's not what I'm looking for.