Works on most sites, but not all. However, is one site where it is the only add-on I've found that will download 1080p and higher versions of videos. Blocked in other add-ons. Also periodically stops working and asks to buy more advanced video software. I did this and found that software didn't work anyplace that the free version doesn't work and is more cumbersome to use. Once the promo for the advanced video shows up have to uninstall and reinstall to use. Sometimes hs just disappeared and needed to reinstall, really for that one site.

That said it is reasonably fast. One other issue is you have to know how many videos you can safely queue as rather than downloading one-by-one or some other number downloads will sometimes fail midstream if too heavy a load and sometimes can resume, sometimes not.