I’ve download FF plugin from Official site but FF continue to use Moonlight plug-in version 1.01 from Ubuntu packages moonlight-plugin-core and moonlight-plugin-mozilla.
I resolved roughly overwriting packages files with latest ones directly from extension:
cd /usr/lib/moon/plugin
sudo rm libmoonloader.so libmoonplugin-ff3bridge.so libmoonplugin.sosudo ln -s ~/.mozilla/firefox/*.default/extensions/moonlight@novell.com/plugins/moonlight/libmoonplugin-ff3bridge.so libmoonplugin-ff3bridge.so
sudo ln -s ~/.mozilla/firefox/*.default/extensions/moonlight@novell.com/plugins/moonlight/libmoonpluginxpi.so libmoonplugin.so
sudo ln -s ~/.mozilla/firefox/*.default/extensions/moonlight@novell.com/plugins/libmoonloaderxpi.so libmoonloader.so
Now restart your browser.