Does multiplayer work under HFW?

Hy everyone!

I'm thinking about that I'll install 4.85 HFW and the HEN on my PS3 SuperSlim. (CECH-4004A)

But before I'd do it, I want to ask: can I play online on PSN after the installation?

I'm on 4.85 OFW right now and I used to play Assassin's Creed IV's multiplayer sometimes. If I reboot the console and don't enable HEN, then it is safe enough to sign in on PSN and start AC4's online MP? Or it is too dangerous and don't recommended?

Sorry if it"s an obvious question, but I don't find...

Does multiplayer work under HFW?