PRE-INSTALL To watch many of the new Quicktime trailers, you'll need to install: libsndfile lame id3lib faad2 faac liba52 You should then recompile and upgrade mplayer, so that is built with support for these codecs. To watch videos on sites that only support IE you need to install the following Firefox extension: http://prdownloads.sourceforge.net/mplayerplug-in/mplayerplug-in-0.2.1.xpi?download It works by converting OBJECT tags to EMBED ones.