Will help you deal with bothersome audio troubles on web-sites like YouTube: audio in a single channel only, way too peaceful or too loud. (However, this extension isn't going to work on all Internet websites because of cross-area issues — however it does work on YouTube!) 會員中心 U利點數 我的新聞 歷史新聞 https://keybookmarks.com/story20033905/presta-addons-an-overview