The changes, brought along with the Proton redesign, have made it less obvious to mute or unmute a playing tab, something you want to do quickly and without confusion.
Before, a simple but effective speaker icon was visible and could be accessed at all times. Now, the icon (dis)appears on hovering. The small capital text hasn't helped me once (too small to read, wants to convey too much information).
So I'd like to suggest using (larger) icons with a larger click area again, for _relevant_ volume/autoplay/PiP tab controls, and abandon too much text for more clarity.