The best web video downloader for macOS
Mac Video Downloader can download pretty much any video that can be downloaded, and from any video hosting site.
It can help you downloading videos with just one click, with up to 10x downloading speeds.
"Mac Video Downloader is a full-featured tool that can create, convert, and download Flash videos, but unlike freeware tools that only work with a few sites or file types (or just with YouTube) Mac Video Downloader can download pretty much any video that can be downloaded, and from any video hosting site, too.
It also quickly and easily converts videos to play on your iPhone or other device. Mac Video Downloader isn't cheap, but it's a much better performer than most of the competition, as the free trial shows."