Description from extension meta
Auto mutes any new incognito tabs. Requires permissions to be executed in incognito. Use CTRL+M to toggle sound of a incognito tab.
Image from store
Description from store
Mute Incognito Tabs is a Chrome extension that automatically mutes all new private (incognito) tabs by default. Quickly un-mute tabs using the CTRL+M keyboard shortcut. This ensures a quieter browsing experience when opening private tabs. Note that this extension needs permissions to run in incognito mode to work!