Detect if user has muted tab?

This is not possible for JavaScript on websites.

But, browser extensions can detect it using the Tabs API.

Learn more: https://developer.chrome.com/extensions/tabs#type-MutedInfo https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/Tabs/MutedInfo

No, this is not possible in Google Chrome.

Such events can be recorded using low-level APIs expoosed by Chrome but it cannot be done via any of the Web APIs available.