[thrdbndndn]

My pet peeve of these is not the volume being too high (which they normally are), but the lack of volume control on web/desktop.

Unfortunately it would be more and more common as the mobile world take the dominance.

[squarefoot]

Firefox already displays a small speaker icon on each tab playing audio that can be used to mute it. A nice addon could display also a volume slider when hovering above it with the mouse, therefore allowing volume control.

[callalex]

Volume control there would require an additional audio buffer which adds unwanted latency to any conference or gaming applications.