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.