Learn how easy it is to sync an existing GitHub or Google Code repo to a SourceForge project! See Demo
mplayerplug-in is so close to being superior to pretty much everything else out there, the devs have done an amazing job. The only thing that seems missing is a progress bar that shows the current time/length of the video and has random time selection abilities (dragging). Honestly, even without that the plugin is better than pretty much anything else out there.
upgrade the current release (actually the feature has been present for about 6 months now).. version 3.25, this feature is in there. Just click on the media progress bar. However, if the bar is not present or the media is a streaming type (ie no FF or REW buttons) then you can't seek.