Firefox Steam Community website problem

I just tried that out on your profile, it's not just you :/

Thanks Obama.

This won't really help, but it looks like the function is expecting a parameter ("rgFriendsToInvite") that isn't being passed in.
(The function is in the profile.js file.)
Not sure if that's really the issue, but it doesn't look like the other parameter-less functions are expecting one and they otherwise have pretty much the same syntax.