Greetings, Lately at v104 onwards the Youtube video sound is muffled, I've tried several solutions that are frequently the source of issue like hardware issue(tried a pair of brand new headphones), volume mixer is at the same level of system and everything else other than Firefox sounds reasonably loud, driver reinstallation, removed cache and preference etc. Last I checked with other browsers for instance Chrome and Edge which are Chromium based and compared both with the same videos but they do not have this issue, so I can confidently say this is Firefox's issue. Hopefully this can be solved. PS: I did saw one of the older bug tracker forum 3 years ago did mention something like force video to run a different encoder that isn't AV01 in about:config , I did not attempt it as I found it uncomfortable to edit and potentially break my browser.