Download Video folders and playlists from links stored in an (1)array or (2)Firefox-bookmarks-folder.
No need to login at Youtube !
youtube-dl.sh downloads only newest Videos into local download folder.
array : only shell and youtube-dl is needed
firefox-bookmark-folder : shell, youtube-dl, firefox (tested with 63.0), sqlite3 . //aria2 (fast download as an option)
check.sh checks for dependencies