All downloads return a text file
SaveTube is now returning "videoplayback.txt" for all downloads. It does not matter what video I try to get or whether I try it in Firefox 57 or Waterfox, they all return an empty text file.
Try the ViewTube update below, see if the downloads work. It's the same as SaveTube.
ViewTube - YouTube issues
For anyone having issue with YouTube, try this update:
I had been having problems with YouTube recently. This update appears to clear them up.
Have you tried logged in?
Message YOUTUBE NOT WORK. ALL THE PAGE ARE INACTIVE, NO VIRTUAL BUTTON