Easy in Vivaldi to silence all other tabs except current. And of course icons if tabs are playing sounds. So my tip is: Get a better browser if yours doesn't have mute-features.
vivaldi.com
How to control sound behavior in Vivaldi | Vivaldi Browser
No matter how many tabs you have open and what the web throws at you, in Vivaldi you have the power to control which audio plays and which doesn’t.
vivaldi.com
