I Ubuntu 10.04 with firefox 7.0.1. To fix the problem I added the repository badgerports, then I installed moonlight-mozilla-plugin from Synaptic, version 2.3.7 No conflict, is operating normally.

http://badgerports.org/help.html

Regards.

Thanks for that; I have done all that you suggested and moonlight successfully installed. Unfortunately in my case it does not operate normally, all I get is a blank white screen. Being a bit of a novice, I have probably done something stupid.  :-(

Whoops - just fixed the typos