I am a subscriber of YouTube Premium. Q1: I downloaded a streaming video and closed and reopened Firefox. I recognized the one I downloaded from the list of YouTube links on Firefox. Thus, I could replay the video from the link. Now, I am supposed to be able to play the video offline or without an internet connection. But if I unplug the network cable from the machine and launch Firefox, nothing on the screen, including the video link. Q2: Where is the downloaded video file saved?