"To get Moonlight, you download it as a Firefox add-on
from the Go-Mono site. This is a straightforward operation and will
be familiar to anyone who's downloaded Firefox add-ons. The one
possible mis-step is that you must be sure to give the site
permission to download and install Moonlight on your browser.
"Officially, Moonlight supports SLED (SUSE Linux Enterprise
Desktop) 10, the latest versions of openSUSE, Fedora and Ubuntu on
32-bit architectures and SLED and openSUSE on 64-bit chips. In
practice, I've installed and used it without any trouble at all on
not only those operating systems but on MEPIS 8, which is based on
Debian 5, Lenny, and Mint 5, which is built on top of Ubuntu
8.10."