I've compile the basic plugin found here but I can't figure out how to install it on my Ubuntu machine.
Quick answer: to enable the plugin in Ubuntu's of Firefox, copy your npbasicplugin.so to /usr/lib/mozilla/plugins/.
The plugins path for various UNIX browsers has varied a lot.
/usr/lib/netscape/plugins//usr/lib/mozilla/plugins//usr/lib/mozilla-firefox/plugins//usr/lib/nsbrowser/plugins//opt/netscape/plugins/Those are only some of the locations that modern browsers on modern distributions seem to use. Luckily, a distribution usually configures all the browsers they ship to look in a common path, so that you only need to install a plugin to one directory to enable it across all browsers on a system. (IIRC BSD ports is an exception, but anyhow...)