This extension is glue between Firefox and the video links, not an actual video engine. This extension fetch the direct link to videos using regular expression, XPath, and DOM. When available, a picture and a select control are displayed to read the video with firefox, using the firefox internal HTML5 compliant media player or a plugin like vlc or mplayer if the user had installed it.
Supported sites/embed video player
Blip
HTML5
Dailymotion
NicoNico
FC2
ScreenWaveMedia