It is only extension work with old and new FF versions. With native executable? Yes. And? Any other downloader solution is a joke, and on Chrome no way to download from Youtube. AVD is a VLC for FF. I use it for years an download several specific video which are hidden via cuncurent downloaders. It was only one time to have to use Quickplayer screen recorder intead of AVD. I am very thankfully about this production.