[arch-general] IceCat and Novell Moonlight pre

[f. gr.]

Hi all,
I'm trying to install Novell Moonlight plugin 3.0 preview 6
<http://www.go-mono.com/moonlight/prerelease.aspx>.

But I got this message:
«GNU IceCat could not install the file at 

http://www.go-mono.com/moonlight/downloads/2.99.0.6/novell-moonlight-2.99.0.6-x86_64.xpi

because: Signing could not be verified.
-260»

I didn't get any error with the previous version
(http://www.go-mono.com/moonlight/downloads/2.99.0.3/novell-moonlight-2.99.0.3-x86_64.xpi).

What did happen?