YouTube Video bookmarklet

This is the easiest method for downloading videos from YouTube, Facebook, and Instagram.

Open a supported browser (Chrome, Firefox, Safari, Microsoft Edge).
Make sure that your bookmarks toolbar is visible in the selected browser.
Drag ... generator to your bookmarks toolbar.
Open the YouTube video you want to download. For example, https://www.youtube.com/watch?v=9bZkp7q19f0
Click the bookmarklet you just created.

Right-click the bookmarklet and select Delete.