Check Firefox plugin page to make sure its enable. Also you can try reinstall VLC, make sure you check install plugin.
I have the same issue with Firefox, missing plug in. I have VLC installed
Please download Firefox for Mac and reinstall VLC!
safari
What browser are you using? We believe VLC only works with Firefox browser.
Alessandro Rossi
when trying to play a live channel on my mac I get a error "missing plug in" . I downloaded "VLC" but still not able to watch live channels