YouTube has always been one of my favorite websites. I go up and go around almost every day, but it is a bit troublesome to download a video I like, so I found these plug-ins and downloaded it with one click!
The first standalone plug-in (need to be installed in the Firefox browser):
search in the add-ons: YouTube Video Downloader
After installation, just open a youtube video, you can see an additional download button below
The second oil monkey plug-in: I
don't know why, the oil monkey plug-in website has also been walled, and I am speechless. . . . . So installing this plug-in also needs to go over the wall,
install the link: https://greasyfork.org/zh-TW/scripts/369400-local-youtube-downloader
After opening, click to install this script
After the installation is complete, there will be an additional download link below the video: