Sound/ Volume inconsistent!

Ok this is weird.

I'm watching a video in FireFox Beta and my system volume/ ringer is on Mute yet the video sound is really loud.

WTF is going on here. I noticed this inconsistency throughout. Like even if I have my sound volume to almost 0 a lot of sounds are still super loud.

Why isn't Volume "Music, video, games..." grouped and same slider as "Ringtone" & "System"?

I have no time, ABSOLUTELY NO TIME to go in settings and change volume each time for all 4 different things.

Is this a Samsung thing? Because it's the most stupid stuff I've seen.

Please let me know how this can be fixed and all volume sliders merged as one?