Well for the stuff that Oxygene posted, you can just downoad most of it (if you click on the link on the rt hand side you get the option (in various sizes) but a few I tried don't allow you to download. With the firefox stuff, it's simply view in the browser unless you can work out the link for the stream for VLC, which I find very difficult anyway. Or if you have something that records youtubes ;) that may work
I'm not a miley fan, and I don't get how they got the dates wrong! heh
Intrigued by both, presume VLC would be the player of choice for streaming and downloads?
That's an odd collection!
Here is german and french browser for multimedia content, some concerts too; https://mediathekviewweb.de/#everywhere=true&future=true :)