It doesn't solve that problem. "It does not, however, universally allow muting a video or game so that it can be played silently while listening to background

It doesn't solve that problem. "It does not, however, universally allow muting a video or game so that it can be played silently while listening to background sounds coming from another tab. (This is not possible in Chrome without either plug-ins such as Flash being updated or Chrome's plug-in architecture undergoing an unlikely major redesign.)" Instead, it: "is a Chrome extension that helps you manage the sound coming from tabs in Google Chrome. It helps you to find which tab(s) are making sounds and provides browser-wide management of tab muting (calling JavaScript functions where available, otherwise hiding it from the page), including automatically muting all background tabs." Basically, the problems mentioned by the Chrome devs are real (at least without modifying Chrome to use a separate Flash process for each tab or updating Flash itself), but it is still possible to give users more control over browser sound than they are currently presented with. (Updated submission to try to make this more clear.)