mozplayerxp is an attempt to embed videos in mozilla firebird and mozilla under linux, the goal is to implement as much windows media/apple quicktime support as possible.
you might ask why another plugin there's already one out there? mplayerplug-in?
mplayerplug-in uses many global variables in it's shared library enviroment this is not reliable since there might be problems when running more than one instances (it's like 2 people are going to share 1 glass at the same time)
the second aim is usability, this project relies on GTK2+ right now, another patch has to get submitted to the mplayer project for adding ALT-RETURN support to that plugin as well.
currently the plugin is able to switch to fullscreen, start and stop without any problems (that means the hardest part of that plugin is done since threading and forking don't affect anything else anymore).