Nothing like what is seen in the preview pictures, when clicking on the extension button a new window opens with a website to enter the video url, after entering the url you can download the video at max 1080p, so eventually it does what it claims to do, but you can only download 3 videos per day and the page is filled with ads and the page pretends like it's taking time to load and prepare the video in order to keep you longer at the ads page.

Bottom line, if you have a better option, pass, if you only need to download a video once in a while, it does work, but in an annoying way.