Before I did not know the easy way, I did it the hard way.
Download the font (whatever.tar.bz2). Then unzip it (tar jzvf ) to ~/.fonts directory (mkdir if does not exits).
Finally run fc-cache. Restart the browser (most of the times refreshing the 'foreign' page worked for me).
Was it simple? Well I found it was simpler to just start synaptic (mintlinux, probably common on all 'debian' based distros) and search for the font, right click, say mark for installation, then 'apply' (of course restart/refresh the web page)