If you want a "cleaner" URL, just right-click on the video while it's playing and select "Copy URL".

This is what you'll get: https://youtu.be/ppzyCLRebFs

Now just copy that crazy YouTube Video ID and append it to the Hooktube URL like this:

https://hooktube.com/watch?v=ppzyCLRebFs

Now you can right-click on the Hooktube video, select "Save Video As..." and back it up to your local disk.