Best video downloader for Firefox Rated 5 out of 5 stars

I've tried several video downloaders for several browsers and this is the best one. Other downloaders either won't download 1080p videos from youtube (1920 x 1080 resolution) or they require you to pay for 1080p capability. This one does it right out of the box. I hope the developer makes a WebExtensions version compatible with FF57. As it is, I've switched over to the Firefox ESR version so I can continue using this plugin, while still getting Firefox security updates until June 2018.