Addon is great, useful and works unlike other gimmicky addons for boosting audio of youtube. But 2 stars, because the addon recently after FF update, starts to produce distorted audio if enabled and audio then gets into distortion (until browser tab is restarted or browser closed and then opened) forever. I faced this issue in firefox ESR, librewolf, floorp browser, waterfox browser and also on android firefox. Didnt faced same with chrome or edge or any other browsers. I hope dev will correct this sooner. Plus if possible, add levels of boosting, it is one fixed. Thanks.