Recently I tested all audio addons, which were updated during the last 12 months. Volumemaxxing by Kernocal is the best for unstable live broadcasts. Its internal architecture seems to be innovative. And it works without global host-permission, which most audio-addons demand. The bad: media-elements are not touched. Volumemaxxing only deals with webaudio. So it fails at the central promise to boost ANY tune. in fact, the list of websites where nothing happens is longer than for other addons: Bandcamp, Dailymotion, Spotify, Yandex-overlays… One positive exception is Soundcloud. Long story short: At the moment, Volumemaxxing is a secondary tool. i'm hoping for further development. Maybe this rewiew will be updated soon.