if using the defualt iceweasle build , just install xine-totem and video will embed within the browser. However, I use a browser package other then what Debian provides so I have to copy mozplugger from Ubuntu becouse the debian repo wants to install iceweasle with it.
sudo dpkg -i mozplugger_1.10.2-2ubuntu1_amd64.deb
cd /usr/lib/firefox-3.5/plugins/
sudo ln -s /etc/lib/mozilla/mozplugger.so
alternatively I instal mplayer-nogui to use the mplayer engine with mozplugger from Ubuntu (does not have player controls).





Is there any particular reason to use the Intrepid mozplugger, and not the latest version?
Ubuntu uses more update libraries then Debian Lenny, and I had found the intrepid package matched the version of libraries that comes with Lenny.