How do I open Youtube content in an app instead of my browser, while clicking on a link?

view full story

http://askubuntu.com – Now when I follow a link in my browser to Youtube, it opens in a new page of my browser, in my case Firefox. I would have liked that it provokes the launch of another app, for example Minitube, VLC or Totem. This app should then run the desired video. I suppose I could extend this question to other video platforms like Dailymotion, or to other contents, like streaming media, but I will leave it for another question. (HowTos)