This is the extension that drops a red button in the Youtube page right below the video. Clicking the button doesn't provide any format or resolution options - only one to download an MP4 file. OK, fine, I'll take that. Things look promising when a dialog box opens with the actual name of the video (i.e., not some cryptic, random filename) to select target directory. After selecting the target download directory the download appears to start and goes for a few bytes but fails. It looked so promising...

I'm guessing the few positive reviews are friends and family because it doesn't seem to have worked in years!?