The Chrome Web Store—where you get Chrome browser extensions—is controlled by YouTube's owner Alphabet/Google. Even an extension ostensibly for this purpose—like the obviously named Video Downloader professional above—states right up front in its description, "The download of YouTube videos to hard drive is locked because of restrictions of the Chrome Store." In general with Chrome extensions, the download of any RTMP protocol video (protected videos) or streaming video isn't possible.
SaveFrom.net has made a name for itself over the last few years. It can do web-based downloads, but also provides software to install and a browser extension, which it pushes. It doesn't support 4K, but few helper sites do—going to a 1,440MB WebM file is an option, but it doesn't come with audio—the only format that does is 720p MP4s. Nor can you use SaveFrom.net to make an MP3. Of course, those options are in the downloadable software.
DistillVideo supports to run in any browser accross any platform, regardless of whether you are using Windows, Mac or Linux, Android, iPhone. Provide audios/videos in full file formats including MP4, AVI, MP3, WEBM, FLV, 3GP, M4A, etc. It also supports HD videos of 1080P, 2K, 4K and 8K. It can convert any online video to MP3 for free (free MP3 converter). Subtitles can be extracted and downloaded as well. No need to install any annoying softwares or apps that may infect your computer or android phone. It is the best and free downlowder to download any video from any site using url online.