Nonsense, absolutely.
if you have only one video on the page, for example 5 MB of size, the extension shows you at least 5 non-working links with size of 1024 KB (all links are the same), couple of links with correct size and name, but they don't work, and finally one working link, but with auto-generated numeric name. And it's 50% chance that download will not be finished.
The same time i tried 2 other extensions, and the work as should exactly on same pages.