I asked this myself a while ago, then forgot about it... Here are some possibilities (I hope so) :
https://www.reddit.com/r/firefox/comments/3iob8v/openwith_addon_and_youtubedl_anyone_know_what_the/?ref=search_posts http://bernaerts.dyndns.org/linux/74-ubuntu/307-ubuntu-firefox-gui-download-youtube-tvreplay-video-streamHopefully you can make it work, that would be a real time saver. I'll try to help more when I have some more time (i.e. soon enough).
