Maybe they have a lawyer on retainer in Norway, but I doubt it. I'm sure they'll get one, but it would be strange for a non-profit like Mozilla to have a worldwide legal staff.
Many large law Liam's know international law. I'd guess that a company like theirs with a strong international presence would be interested in that.
Even if they don't have someone handy who knows Norwegian law, they could easily retain them.
My point is that proper legal advice can not be what's preventing them from helping. My question to OP was about the differences in laws which he/she was referring to.