Firefox shows a little speaker icon on any tab making sound which you can click to mute it.
I doubt have the time to inspect 1200 tabs across 18 browser window, so I use this as a shortcut. https://addons.mozilla.org/en-US/firefox/addon/go-to-sound-tab/
Most browsers have this now. What I really need is an icon above the window with the sound coming from it when I'm selecting the app from the taskbar.
Firefox has a setting that prevents audio from autoplaying as well. Especially after Google's latest endeavours, I can't support Chrome, and with their hands in Chromium, the well is kind of poisoned. Microsoft is only slightly better than Google in regards to privacy.
Edit: tbf, you didn't say you use either of those, but statistics point to it being the likely browsers for most people reading the comment.
Firefox used to have this... Now the speaker is hidden until you hover the mouse over the tab to make it visible. If you don't know which tab is making the noise having to hover over each tab instead of knowing at a quick glance isn't all that great.
it's the one with the speaker icon on it
It is all in your mind.
