Our Add-On will add a new icon on your toolbar (see screenshot). When you are visiting a YouTube video URL (youtube.com/watch?v=videoId) you can use our Add-On by clicking on the icon. A small popup will open and show you the possible formats. Once you choose a format, a new tab will open with our website ytmp3.nu. The conversion will start directly. As soon the conversion is finished you will be able to download the converted YouTube video by clicking on the download button.